# Difference: GEMDPGPublic (1 vs. 50)

#### Revision 502019-08-27 - ElizabethRoseStarling

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 META TOPICPARENT name="MuonDPGResults"

# GEM DPG Public Page

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## Template for future use

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This is an example, change it and copy paste it to put here all detector production plots with their caption.
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## Public Results 2019

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### GE1/1 Detectors QC Plots for TWEPP2019

Figure

Approved

by

Description
Muon Community (GMM)

TWEPP2019:

Efficiency of GE1/1-X-S-PAK-0001, one of the detectors that has already been installed in CMS as part of GE1/1, as obtained from QC8 measurements. VFAT 16 shows an efficiency < 97%. However, this is expected, as it is at the edge of acceptance. We have 8 eta partitions, and when we reconstruct the hits, we reconstruct them so that they are in the center of the eta partition. So if a track is slightly angled, it gets reconstructed so that the track is straight. However, the superchambers can be slightly off in y from each other, which lowers the efficiency. However, the error bars show that we are still within the realm of acceptability.

Muon Community (GMM)

TWEPP2019:

Plot of digis / single hits per strip for GE1/1-X-S-PAK-0001, run 206 of QC8. Showing, with the highest granularity – the firing of the strips. There are several instances (in yellow/orange) which are confirmed as noise by looking at the associated SCurves.

Muon Community (GMM)

TWEPP2019:

Associated RecHits for the top detectors of Row 1. This plot shows only GE1/1-X-S-PAK-001, in column 1. For a given test chamber (in this case, GE1/1-X-S-PAK-0001), the other chambers in the stand are taken as reference. For a given event, the muon track is reconstructed using the reference chambers, and then extrapolated to the test chamber. The associated RecHit is a verified hit in the test chamber that matches the extrapolation. This allows us to measure the efficiency of the chamber. Each bin is 1mm wide.

Muon Community (GMM)

TWEPP2019:

SCurve of GE1/1-X-S-PAK-0001, QC8 run 206

Muon Community (GMM)

TWEPP2019:

Box plots of the mean (threshold) for the SCurves of GE1/1-X-S-PAK-0001 QC8 Run 206.

50% of the channels are within the colored box

100% of the channels are within the dashed lines

The mean is represented by the circle in the colored box

The median is represented by the line in the colored box

Muon Community (GMM)

TWEPP2019:

Box plot of the sigma (ENC) for the SCurves of GE1/1-X-S-PAK-0001 QC8 Run 206

50% of the channels are within the colored box

100% of the channels are within the dashed lines

The mean is represented by the circle in the colored box

The median is represented by the line in the colored box

Noise increases from narrowest eta sector to widest eta sector, with additional noise for the VFATs closest to the optohybrid

A Muon Community (GMM) The hits associated with a reconstructed cosmic muon track for each of the 8 η partitions of GE1/1-X-S-PAK-0001, by cluster size, for QC8 run 206.

### CHARM plots for paper

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 Muon Community (GMM) The plots show a discharge induced on a 10x10 cm2 3:1:2:1 Triple-GEM detector during the tests performed in laboratory before the CHARM irradiation. The sources used to induce the discharge were: 1 𝑀𝐵𝑞 109Cd +1 𝑀𝐵𝑞 55Fe + 25 𝑀𝐵𝑞 109Cd. The gain of the Triple-GEM detector was 3x10^5. The plots show the current of each channel of the A1515TG multichannel board, in uA, as a function of the time, in h:min:sec, in particular the top plot includes: drift, G1Top, G2Top and G3Top, while the bottom plot includes: G1Bot, G2Bot and G3Bot. This nomenclature is widely used to indicate the different layers of Triple-GEM detectors: GXTop indicates the top electrode of the foil X, while GXBot indicates the bottom electrode of the foil X. The baseline current of each channel has an offset of few uA because the zero check and zero correction were not performed on this board. The event presents a first small spike, around 18:17:30, positive on the top channels and negative on the bottom channels. The biggest spike at around 18:18:30 triggered the channels trip. Contact: cms-dpg-conveners-gem@cern.ch
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 Muon Community (GMM) The plots show a discharge induced on a 10x10 cm2 3:1:2:1 Triple-GEM detector during the tests performed in laboratory before the CHARM irradiation. The sources used to induce the discharge were: 1 𝑀𝐵𝑞 109Cd +1 𝑀𝐵𝑞 55Fe + 25 𝑀𝐵𝑞 109Cd. The gain of the Triple-GEM detector was 3x10^5. The plots show the current of each channel of the A1515TG multichannel board, in uA, as a function of the time, in h:min:sec, in particular the top plot includes: drift, G1Top, G2Top and G3Top, while the bottom plot includes: G1Bot, G2Bot and G3Bot. This nomenclature is widely used to indicate the different layers of Triple-GEM detectors: GXTop indicates the top electrode of the foil X, while GXBot indicates the bottom electrode of the foil X. The baseline current of each channel has an offset of few uA because the zero check and zero correction were not performed on this board. The event presents a first small spike, around 18:17:30, positive on the top channels and negative on the bottom channels. The biggest spike at around 18:18:30 triggered the channels trip. Contact: cms-dpg-conveners-gem@cern.ch

 Muon Community (GMM) The plot shows the maximum readout current within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The maximum current of each spill is calculated as i_MAX=max(I_j), where i_j are the 50 current measurements performed by the picoammeter in the single spill. The results, based on 23048 PS spills, show an average value of 21,5±5,2 uA. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch
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 Muon Community (GMM) The plot shows the average readout current within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The average current of each spill is calculated as 𝑖_𝐴𝑉=(sum(i_j))/50 where i_j are the 50 current measurements performed by the picoammeter in the single spill. The results, based on 23048 PS spills, show an average value of 0,35±0,02 uA. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The plot shows the total charge per spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The total charge per spill is calculated as 𝑞_𝑇𝑂𝑇=sum(i_j × 10 𝑚𝑠) where i_j are the 50 current measurements performed by the picoammeter in the single spill and 10 ms is the average time used by the picoammeter for each single measurement. The results, based on 23048 PS spills, show an average value of 1,77±0,11 uA/spill. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch
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 Muon Community (GMM) The plot shows the average readout current within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The average current of each spill is calculated as 𝑖_𝐴𝑉=(sum(i_j))/50 where i_j are the 50 current measurements performed by the picoammeter in the single spill. The results, based on 23048 PS spills, show an average value of 0,35±0,02 uA. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The plot shows the total charge per spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The total charge per spill is calculated as 𝑞_𝑇𝑂𝑇=sum(i_j × 10 𝑚𝑠) where i_j are the 50 current measurements performed by the picoammeter in the single spill and 10 ms is the average time used by the picoammeter for each single measurement. The results, based on 23048 PS spills, show an average value of 1,77±0,11 uA/spill. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch

 Muon Community (GMM) The plot shows the measured number of events within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The results, based on 23048 PS spills, show an average value of (2,47±0,06)×10^5 events per spill. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch
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 Muon Community (GMM) The plot shows the estimated number of events within a spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The estimation is obtained using the average current in the spill, with the formula 𝑁_𝐴𝑉𝐸^𝐸𝑆𝑇=𝑖_𝐴𝑉𝐸/(𝑛0 𝑞0 𝐺) 𝑡_𝑆𝑃𝐼𝐿𝐿 where 𝑖_𝐴𝑉𝐸 is calculated as in slide 5, 𝑛0=100, from Geant4 simulations, 𝑞0=1,6×10^(−19) 𝐶, 𝐺=4×10^4, 𝑡_𝑆𝑃𝐼𝐿𝐿=325𝑚𝑠 is the length of the spill. The results, based on 23048 PS spills, show an average value of (1,79±0,11)×10^6 events per spill, almost one order of magnitude higher than the measured one. An estimation of the dead time can be obtained from these results as: 𝑁^𝐸𝑆𝑇=𝑁^𝑀𝐸𝐴/(1−(𝑁^𝑀𝐸𝐴 𝜏)/𝑡_𝑆𝑃𝐼𝐿𝐿 )→𝜏=𝑡_𝑆𝑃𝐼𝐿𝐿/𝑁^𝑀𝐸𝐴 (1−𝑁^𝑀𝐸𝐴/𝑁^𝐸𝑆𝑇 )=1,13 𝜇𝑠 The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The plot shows the estimated number of events within a spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The estimation is obtained using the maximum current in the spill, with the formula 𝑁_𝑀𝐴𝑋^𝐸𝑆𝑇=𝑖_𝑀𝐴𝑋/(𝑛0 𝑞0 𝐺) 𝑡_𝑆𝑃𝐼𝐿𝐿 where 𝑖_𝑀𝐴𝑋 is calculated as in slide 4, 𝑛0=100, from Geant4 simulations, 𝑞0=1,6×10^(−19) 𝐶, 𝐺=4×10^4, 𝑡_𝑆𝑃𝐼𝐿𝐿=325𝑚𝑠 is the length of the spill. The results, based on 23048 PS spills, show an average value of (1,09±0,26)×10^7 events per spill, almost two orders of magnitude higher than the measured one. An estimation of the dead time can be obtained from these results as: 𝑁^𝐸𝑆𝑇=𝑁^𝑀𝐸𝐴/(1−(𝑁^𝑀𝐸𝐴 𝜏)/𝑡_𝑆𝑃𝐼𝐿𝐿 )→𝜏=𝑡_𝑆𝑃𝐼𝐿𝐿/𝑁^𝑀𝐸𝐴 (1−𝑁^𝑀𝐸𝐴/𝑁^𝐸𝑆𝑇 )=1,29 𝜇𝑠 The estimation of the dead time is compatible with the one performed on the average current measured in the spill, which means that the dead time was constant over the whole acquisition period. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The box plot represents the estimation of the discharge probability per hit measured at CHARM with a 10x10 cm^2 3:1:2:1 Triple-GEM detector. The black line shows the median of the distribution, the circle is the mean, the box the first and third quartile, while the error bars show the maximum and the minimum. The values of discharge probability/hit used in this plot are obtained with the formula:𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝑝𝑟𝑜𝑏𝑎𝑏𝑖𝑙𝑖𝑡𝑦/ℎ𝑖𝑡=𝑁_𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒/(𝑁_𝐶𝑂𝑈𝑁𝑇𝑆×𝑁_𝑆𝑃𝐼𝐿𝐿 ) where, NCOUNTS is the average number of counts, NSPILL is the number is the number of spills and Ndischarge is the number of discharge detected in the test. As this number was 0 at CHARM, we are using 3 as upper limit and, as a consequence, the discharge probability/hit value is an upper limit as well. Four values have been calculated, corresponding to NCOUNTS=𝑁_𝑀𝐴𝑋^𝐸𝑆𝑇, NCOUNTS=𝑁_𝐴𝑉𝐸^𝐸𝑆𝑇, NCOUNTS=𝑁_^𝑀𝐸𝐴 and corrected for the dead time and NCOUNTS simulated. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch

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 Muon Community (GMM) The plot shows the estimated number of events within a spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The estimation is obtained using the average current in the spill, with the formula 𝑁_𝐴𝑉𝐸^𝐸𝑆𝑇=𝑖_𝐴𝑉𝐸/(𝑛0 𝑞0 𝐺) 𝑡_𝑆𝑃𝐼𝐿𝐿 where 𝑖_𝐴𝑉𝐸 is calculated as in slide 5, 𝑛0=100, from Geant4 simulations, 𝑞0=1,6×10^(−19) 𝐶, 𝐺=4×10^4, 𝑡_𝑆𝑃𝐼𝐿𝐿=325𝑚𝑠 is the length of the spill. The results, based on 23048 PS spills, show an average value of (1,79±0,11)×10^6 events per spill, almost one order of magnitude higher than the measured one. An estimation of the dead time can be obtained from these results as: 𝑁^𝐸𝑆𝑇=𝑁^𝑀𝐸𝐴/(1−(𝑁^𝑀𝐸𝐴 𝜏)/𝑡_𝑆𝑃𝐼𝐿𝐿 )→𝜏=𝑡_𝑆𝑃𝐼𝐿𝐿/𝑁^𝑀𝐸𝐴 (1−𝑁^𝑀𝐸𝐴/𝑁^𝐸𝑆𝑇 )=1,13 𝜇𝑠 The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The plot shows the estimated number of events within a spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The estimation is obtained using the maximum current in the spill, with the formula 𝑁_𝑀𝐴𝑋^𝐸𝑆𝑇=𝑖_𝑀𝐴𝑋/(𝑛0 𝑞0 𝐺) 𝑡_𝑆𝑃𝐼𝐿𝐿 where 𝑖_𝑀𝐴𝑋 is calculated as in slide 4, 𝑛0=100, from Geant4 simulations, 𝑞0=1,6×10^(−19) 𝐶, 𝐺=4×10^4, 𝑡_𝑆𝑃𝐼𝐿𝐿=325𝑚𝑠 is the length of the spill. The results, based on 23048 PS spills, show an average value of (1,09±0,26)×10^7 events per spill, almost two orders of magnitude higher than the measured one. An estimation of the dead time can be obtained from these results as: 𝑁^𝐸𝑆𝑇=𝑁^𝑀𝐸𝐴/(1−(𝑁^𝑀𝐸𝐴 𝜏)/𝑡_𝑆𝑃𝐼𝐿𝐿 )→𝜏=𝑡_𝑆𝑃𝐼𝐿𝐿/𝑁^𝑀𝐸𝐴 (1−𝑁^𝑀𝐸𝐴/𝑁^𝐸𝑆𝑇 )=1,29 𝜇𝑠 The estimation of the dead time is compatible with the one performed on the average current measured in the spill, which means that the dead time was constant over the whole acquisition period. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The box plot represents the estimation of the discharge probability per hit measured at CHARM with a 10x10 cm^2 3:1:2:1 Triple-GEM detector. The black line shows the median of the distribution, the circle is the mean, the box the first and third quartile, while the error bars show the maximum and the minimum. The values of discharge probability/hit used in this plot are obtained with the formula:𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝑝𝑟𝑜𝑏𝑎𝑏𝑖𝑙𝑖𝑡𝑦/ℎ𝑖𝑡=𝑁_𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒/(𝑁_𝐶𝑂𝑈𝑁𝑇𝑆×𝑁_𝑆𝑃𝐼𝐿𝐿 ) where, NCOUNTS is the average number of counts, NSPILL is the number is the number of spills and Ndischarge is the number of discharge detected in the test. As this number was 0 at CHARM, we are using 3 as upper limit and, as a consequence, the discharge probability/hit value is an upper limit as well. Four values have been calculated, corresponding to NCOUNTS=𝑁_𝑀𝐴𝑋^𝐸𝑆𝑇, NCOUNTS=𝑁_𝐴𝑉𝐸^𝐸𝑆𝑇, NCOUNTS=𝑁_^𝑀𝐸𝐴 and corrected for the dead time and NCOUNTS simulated. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. Contact: cms-dpg-conveners-gem@cern.ch

### Bending Studies for MPGD2019

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Figure Description
*LHCC2019: The plot shows the measured values of the Effective Gas Gain of the Triple-GEM prototype under test as a function of the Divider Current. The gain is calculated as: 𝑮=𝑰_𝒂𝒏/(𝒆 𝒏_𝟎 𝑹), where 𝑰_𝒂𝒏: anodic current, e: electron charge, 𝒏_𝟎: number of primaries, R: rate at the maximum efficiency. Gain difference in the two sectors is due to the hole in the drift plane which distorts the electric field.
*LHCC2019: The plot shows the Hit Rate of the Triple-GEM prototype irradiated with a 55Fe source in function of the Divider Current. Rate in the alpha sector is lower because of the hole in the drift plane, resulting in less photon converted in the drift gap. The aim of this measurement is to identify the best workink point.
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 *LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. Silicon traces means that some polymers start to deposit.

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 Muon Community (GMM) LHCC2019: Discharge probability as a function of effective gas gain of GE1/1-X-S-KOREA-0004.: Each discharge event is identified through rapid current change of the HV power supply. A loop antenna is wound around a voltage divider wire to capture the induced signal from the current change in the HV circuit. The measurement is performed with 241Am 5.4 MeV alpha source to induce large primary charge. The discharge probability is fit to exponential form to estimate the probability in low gas gain region. The expected probability at the gain of 104 is ~10-9.

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 Muon Community (GMM) LHCC2019: Response Uniformity of GE1/1 chambers tested in Aachen. To measure the gas gain the standard QC5 methodology for GE1/1 production is used. The standard deviation of the gain distribution is used as a measure for the response uniformity.

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## Public Results 2018

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 Muon Community (GMM) *IEEE2018: This plot shows the position of the interactions undergone by neutrons in the Triple-GEM detector. It’s clear that, as expected, the regions with higher interaction number are the readout board and the shielding PCB placed on top of the detector. Some interactions also occurs in the GEM foils themselves. In the gas gaps instead the interaction probability for neutrons is much lower. In the plot with the aluminum support, a peak due to the presence of the support itself can be identified at z = 12.5 mm. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. The simulated geometry includes the detector and the aluminum support used during the actual test.

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 Muon Community (GMM) ICHEP2018: Aging test of GE1/1-S-X-KOREA-0001 detector. Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from Cs 137 for 1300 hour continuously. No gain drop due to aging effect is observed up to 34mC/cm^2. It corresponds to 113 years of GE2/1 and 1.2 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.

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 Muon Community (GMM) CHEP2018: Total energy deposited by gamma. The plots show the total energy deposited into the different gaps by a gamma hitting the detector, as a function of the energy of the gamma itself. This number doesn’t include only the energy lost by ionization, but all the energy deposited in each process that the particle undergone. For this reason, this is not optimal for the calculation of the number of primaries produced in the interaction, because it would give an overestimation. The frequency on the z axis is obtained by dividing the number of events in which the gamma deposits a certain amount of energy by the number of gamma generated for each energy bin in the simulation (10^6). Interesting is the fact that, while for neutrons (previous plot) the energy deposited reaches values up to 1 MeV, for photons the maximus is of the order of 100 keV. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

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 Muon Community (GMM) QC5 gain uniformity plot of GE2/1-M4detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) Example of the QC5 gain curve output: Typical effective gain curve obtained during the GE1/1 quality control. I_divider is the current flowing through the HV resistive divider that provide potential to the detector electrodes. P0 and T0 corrections parameter are determined by averaging the temperature and pressure conditions in the P5 cavern. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) X-ray Ray Aging Test - Weekly Energy Resolution Measurements: Result of the X-ray Triple-GEM aging test showing the energy resolution as a function of the accumulated charge. The detector under test is a GE1/1-X-S-CERN-0002 chamber operating in Ar/CO2 (70:30) at an initial gas gain of 2X10^4. The energy spectrum of the 109Cd source was measured every weeks and the corresponding energy resolution stays stable during the entire test. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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## Public Results 2017

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• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
• Slice Test Talk Michele in WGM 335 2017-11-16 indico link Note that this is not an approval talk
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 Muon Community (GMM) Title: Description (missing). Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Other formats: pdf

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 Muon Community (GMM) Efficiency across the GE2/1 M4 μRWell detector: The efficiency varies between 98 and 99.5%. The detector shape is drawn on top of the 2D plot. Gas: Ar:CO2 (70:30). Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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Plots describing the performance of the triple-GEM chambers in the slice test. For most time of 2017, the slice test GEMs were not included in CMS running and the operation went almost independent. Therefore plots related to the HV and LV stability of the system and plots related to the calibration of the electronics did not need to be approved by Run Coordination and hence were only approved by the CMS Muon Community in the GMM. At the end of 2017 the GEMs were included in CMS running and CMS triggers were used to make the plots of the delay between the GEM DAQ S-bit and the CMS L1 Accept. These plots were approved by Run Coordination followed by a CMS wide approval.
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 Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C Muon Community (GMM)

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• No RC approval necessary (generic R&D, no data from P5)
• Plots approved in GMM 2017-xx-yy No Slides presented to GMM
• Plots presented in GEM DPG indico link
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## Public Results 2016

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• CMS DOC DB CMS-doc-13494
• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
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## Public Results 2015

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## Public Results 2014

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• CMS Detector Performance Note No DP made yet
• Plots approved in WGM 200 2014-09-178 indico link slides pdf
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• No Plots approved in GMM since the meeting at that time was not yet used for Muon-Wide Plot approval
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## Public Results 2010-2013

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Papers / Conference Reports published in 2010-2013: * 2010; https://cds.cern.ch/record/1316084 * 2011; https://cds.cern.ch/record/1401079 * 2012; https://cds.cern.ch/record/1494965 * 2013; https://cds.cern.ch/record/1973272 Dedicated Approval Meetings * ECFA 2013 Plot Approval
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#### Revision 492019-08-26 - IlariaVai

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# GEM DPG Public Page

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## Public Results 2019

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### CHARM plots for paper

Figure Approved by Description
Muon Community (GMM) The plots show a discharge induced on a 10x10 cm2 3:1:2:1 Triple-GEM detector during the tests performed in laboratory before the CHARM irradiation. The sources used to induce the discharge were: 1 𝑀𝐵𝑞 109Cd +1 𝑀𝐵𝑞 55Fe + 25 𝑀𝐵𝑞 109Cd. The gain of the Triple-GEM detector was 3x10^5. The plots show the current of each channel of the A1515TG multichannel board, in uA, as a function of the time, in h:min:sec, in particular the top plot includes: drift, G1Top, G2Top and G3Top, while the bottom plot includes: G1Bot, G2Bot and G3Bot. This nomenclature is widely used to indicate the different layers of Triple-GEM detectors: GXTop indicates the top electrode of the foil X, while GXBot indicates the bottom electrode of the foil X. The baseline current of each channel has an offset of few uA because the zero check and zero correction were not performed on this board. The event presents a first small spike, around 18:17:30, positive on the top channels and negative on the bottom channels. The biggest spike at around 18:18:30 triggered the channels trip.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The plot shows the maximum readout current within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The maximum current of each spill is calculated as i_MAX=max(I_j), where i_j are the 50 current measurements performed by the picoammeter in the single spill. The results, based on 23048 PS spills, show an average value of 21,5±5,2 uA. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The plot shows the average readout current within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The average current of each spill is calculated as 𝑖_𝐴𝑉=(sum(i_j))/50 where i_j are the 50 current measurements performed by the picoammeter in the single spill. The results, based on 23048 PS spills, show an average value of 0,35±0,02 uA. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The plot shows the total charge per spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The total charge per spill is calculated as 𝑞_𝑇𝑂𝑇=sum(i_j × 10 𝑚𝑠) where i_j are the 50 current measurements performed by the picoammeter in the single spill and 10 ms is the average time used by the picoammeter for each single measurement. The results, based on 23048 PS spills, show an average value of 1,77±0,11 uA/spill. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The plot shows the measured number of events within a spill for the 10x10 cm^2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The results, based on 23048 PS spills, show an average value of (2,47±0,06)×10^5 events per spill. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The plot shows the estimated number of events within a spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The estimation is obtained using the average current in the spill, with the formula 𝑁_𝐴𝑉𝐸^𝐸𝑆𝑇=𝑖_𝐴𝑉𝐸/(𝑛0 𝑞0 𝐺) 𝑡_𝑆𝑃𝐼𝐿𝐿 where 𝑖_𝐴𝑉𝐸 is calculated as in slide 5, 𝑛0=100, from Geant4 simulations, 𝑞0=1,6×10^(−19) 𝐶, 𝐺=4×10^4, 𝑡_𝑆𝑃𝐼𝐿𝐿=325𝑚𝑠 is the length of the spill. The results, based on 23048 PS spills, show an average value of (1,79±0,11)×10^6 events per spill, almost one order of magnitude higher than the measured one. An estimation of the dead time can be obtained from these results as: 𝑁^𝐸𝑆𝑇=𝑁^𝑀𝐸𝐴/(1−(𝑁^𝑀𝐸𝐴 𝜏)/𝑡_𝑆𝑃𝐼𝐿𝐿 )→𝜏=𝑡_𝑆𝑃𝐼𝐿𝐿/𝑁^𝑀𝐸𝐴 (1−𝑁^𝑀𝐸𝐴/𝑁^𝐸𝑆𝑇 )=1,13 𝜇𝑠 The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The plot shows the estimated number of events within a spill for the 10x10 cm2 3:1:2:1 Triple-GEM detector irradiated at CHARM. The estimation is obtained using the maximum current in the spill, with the formula 𝑁_𝑀𝐴𝑋^𝐸𝑆𝑇=𝑖_𝑀𝐴𝑋/(𝑛0 𝑞0 𝐺) 𝑡_𝑆𝑃𝐼𝐿𝐿 where 𝑖_𝑀𝐴𝑋 is calculated as in slide 4, 𝑛0=100, from Geant4 simulations, 𝑞0=1,6×10^(−19) 𝐶, 𝐺=4×10^4, 𝑡_𝑆𝑃𝐼𝐿𝐿=325𝑚𝑠 is the length of the spill. The results, based on 23048 PS spills, show an average value of (1,09±0,26)×10^7 events per spill, almost two orders of magnitude higher than the measured one. An estimation of the dead time can be obtained from these results as: 𝑁^𝐸𝑆𝑇=𝑁^𝑀𝐸𝐴/(1−(𝑁^𝑀𝐸𝐴 𝜏)/𝑡_𝑆𝑃𝐼𝐿𝐿 )→𝜏=𝑡_𝑆𝑃𝐼𝐿𝐿/𝑁^𝑀𝐸𝐴 (1−𝑁^𝑀𝐸𝐴/𝑁^𝐸𝑆𝑇 )=1,29 𝜇𝑠 The estimation of the dead time is compatible with the one performed on the average current measured in the spill, which means that the dead time was constant over the whole acquisition period. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM) The box plot represents the estimation of the discharge probability per hit measured at CHARM with a 10x10 cm^2 3:1:2:1 Triple-GEM detector. The black line shows the median of the distribution, the circle is the mean, the box the first and third quartile, while the error bars show the maximum and the minimum. The values of discharge probability/hit used in this plot are obtained with the formula:𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒 𝑝𝑟𝑜𝑏𝑎𝑏𝑖𝑙𝑖𝑡𝑦/ℎ𝑖𝑡=𝑁_𝐷𝑖𝑠𝑐ℎ𝑎𝑟𝑔𝑒/(𝑁_𝐶𝑂𝑈𝑁𝑇𝑆×𝑁_𝑆𝑃𝐼𝐿𝐿 ) where, NCOUNTS is the average number of counts, NSPILL is the number is the number of spills and Ndischarge is the number of discharge detected in the test. As this number was 0 at CHARM, we are using 3 as upper limit and, as a consequence, the discharge probability/hit value is an upper limit as well. Four values have been calculated, corresponding to NCOUNTS=𝑁_𝑀𝐴𝑋^𝐸𝑆𝑇, NCOUNTS=𝑁_𝐴𝑉𝐸^𝐸𝑆𝑇, NCOUNTS=𝑁_^𝑀𝐸𝐴 and corrected for the dead time and NCOUNTS simulated. The Triple-GEM detector was operated at CHARM in Ar/C02 70/30 gas mixture, with a gas flow of 10 l/h and a gain of 4x10^4. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

Contact: cms-dpg-conveners-gem@cern.ch

### Bending Studies for MPGD2019

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#### Revision 482019-08-21 - ElizabethRoseStarling

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## Template for future use

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## Public Results 2019

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Figure Approved by Description
Muon Community (GMM)

Detection efficiency of chamber 28 layer 2:

Detection efficiencies of GE1/1 slice test detector 28 layer 2 for muons as a function of η partition (iη= 1~8), measured in a subset of data samples taken in 2018. Each global muon with pT > 20 GeV is extrapolated to the GEM detector to associate with GEM hits. The extrapolated muon is required to be 20 strips away from the edges of the detector. Two η partitions 1 and 2 have a fraction of dead strips at 1.3% and 2.1%, respectively, while no dead strips on iη= 3~8. A larger fraction of strips on iη= 1 and 2 (19.0% and 9.4%) are inactive, mostly due to the higher thresholds applied to the VFAT chips. This applied threshold is cutting the signal charge on each strip (especially at iη= 1), resulted in low detection efficiency for iη= 1 and 2.

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 1:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 2:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 3:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 4:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 5:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 6:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 7:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 8:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

### GE1/1 Detectors QC Plots for TWEPP2019

Figure Approved by Description
Muon Community (GMM)

TWEPP2019:

<!--StartFragment-->

Efficiency of GE1/1-X-S-PAK-0001, one of the detectors that has already been installed in CMS as part of GE1/1, as obtained from QC8 measurements. VFAT 16 shows an efficiency < 97%. However, this is expected, as it is at the edge of acceptance. We only have 8 eta partitions, and when we reconstruct the hits, we reconstruct them so that it was in the center of the eta partition. So if a track is slightly angled, it gets reconstructed so that the track is straight. However, the superchambers can be slightly off in y from each other. So this messes up the efficiency, and it cannot be corrected for. However, the error bars show that we are still within the realm of acceptability.

<!--EndFragment-->

Muon Community (GMM)

TWEPP2019:

Plot of digis / single hits per strip for GE1/1-X-S-PAK-0001, run 206 of QC8. Showing, with the highest granularity – the firing of the strips. There are several instances (in yellow/orange) which are confirmed as noise by looking at the associated SCurves.

Muon Community (GMM)

TWEPP2019:

Associated RecHits for the top detectors of Row 1. This plot shows only GE1/1-X-S-PAK-001, in column 1. For a given test chamber (in this case, GE1/1-X-S-PAK-0001), the other chambers in the stand are taken as reference. For a given event, the muon track is reconstructed using the reference chambers, and then extrapolated to the test chamber. The associated RecHit is a verified hit in the test chamber that matches the extrapolation. This allows us to measure the efficiency of the chamber. Each bin is 1mm wide.

Muon Community (GMM)

TWEPP2019:

Box plots of the mean (threshold) for the SCurves of GE1/1-X-S-PAK-0001 QC8 Run 206

Muon Community (GMM)

TWEPP2019:

Box plot of the sigma (ENC) for the SCurves of GE1/1-X-S-PAK-0001 QC8 Run 206

Muon Community (GMM)

TWEPP2019:

The hits associated with a reconstructed cosmic muon track for each of the 8 η partitions of GE1/1-X-S-PAK-0001, by cluster size, for QC8 run 206.

Muon Community (GMM)

TWEPP2019:

The total hits associated with a reconstructed cosmic muon track for GE1/1-X-S-PAK-0001, by cluster size, for QC8 run 206.

### Bending Studies for MPGD2019

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Figure Description
*LHCC2019: The plot shows the measured values of the Effective Gas Gain of the Triple-GEM prototype under test as a function of the Divider Current. The gain is calculated as: 𝑮=𝑰_𝒂𝒏/(𝒆 𝒏_𝟎 𝑹), where 𝑰_𝒂𝒏: anodic current, e: electron charge, 𝒏_𝟎: number of primaries, R: rate at the maximum efficiency. Gain difference in the two sectors is due to the hole in the drift plane which distorts the electric field.
*LHCC2019: The plot shows the Hit Rate of the Triple-GEM prototype irradiated with a 55Fe source in function of the Divider Current. Rate in the alpha sector is lower because of the hole in the drift plane, resulting in less photon converted in the drift gap. The aim of this measurement is to identify the best workink point.
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 *LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. Silicon traces means that some polymers start to deposit.

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 Muon Community (GMM) LHCC2019: Discharge probability as a function of effective gas gain of GE1/1-X-S-KOREA-0004.: Each discharge event is identified through rapid current change of the HV power supply. A loop antenna is wound around a voltage divider wire to capture the induced signal from the current change in the HV circuit. The measurement is performed with 241Am 5.4 MeV alpha source to induce large primary charge. The discharge probability is fit to exponential form to estimate the probability in low gas gain region. The expected probability at the gain of 104 is ~10-9.

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 Muon Community (GMM) LHCC2019: Response Uniformity of GE1/1 chambers tested in Aachen. To measure the gas gain the standard QC5 methodology for GE1/1 production is used. The standard deviation of the gain distribution is used as a measure for the response uniformity.

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## Public Results 2018

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 Muon Community (GMM) *IEEE2018: This plot shows the position of the interactions undergone by neutrons in the Triple-GEM detector. It’s clear that, as expected, the regions with higher interaction number are the readout board and the shielding PCB placed on top of the detector. Some interactions also occurs in the GEM foils themselves. In the gas gaps instead the interaction probability for neutrons is much lower. In the plot with the aluminum support, a peak due to the presence of the support itself can be identified at z = 12.5 mm. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. The simulated geometry includes the detector and the aluminum support used during the actual test.

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 Muon Community (GMM) ICHEP2018: Aging test of GE1/1-S-X-KOREA-0001 detector. Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from Cs 137 for 1300 hour continuously. No gain drop due to aging effect is observed up to 34mC/cm^2. It corresponds to 113 years of GE2/1 and 1.2 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.

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 Muon Community (GMM) CHEP2018: Total energy deposited by gamma. The plots show the total energy deposited into the different gaps by a gamma hitting the detector, as a function of the energy of the gamma itself. This number doesn’t include only the energy lost by ionization, but all the energy deposited in each process that the particle undergone. For this reason, this is not optimal for the calculation of the number of primaries produced in the interaction, because it would give an overestimation. The frequency on the z axis is obtained by dividing the number of events in which the gamma deposits a certain amount of energy by the number of gamma generated for each energy bin in the simulation (10^6). Interesting is the fact that, while for neutrons (previous plot) the energy deposited reaches values up to 1 MeV, for photons the maximus is of the order of 100 keV. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

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 Muon Community (GMM) QC5 gain uniformity plot of GE2/1-M4detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) Example of the QC5 gain curve output: Typical effective gain curve obtained during the GE1/1 quality control. I_divider is the current flowing through the HV resistive divider that provide potential to the detector electrodes. P0 and T0 corrections parameter are determined by averaging the temperature and pressure conditions in the P5 cavern. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) X-ray Ray Aging Test - Weekly Energy Resolution Measurements: Result of the X-ray Triple-GEM aging test showing the energy resolution as a function of the accumulated charge. The detector under test is a GE1/1-X-S-CERN-0002 chamber operating in Ar/CO2 (70:30) at an initial gas gain of 2X10^4. The energy spectrum of the 109Cd source was measured every weeks and the corresponding energy resolution stays stable during the entire test. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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## Public Results 2017

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• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
• Slice Test Talk Michele in WGM 335 2017-11-16 indico link Note that this is not an approval talk
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 Muon Community (GMM) Title: Description (missing). Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Other formats: pdf

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 Muon Community (GMM) Efficiency across the GE2/1 M4 μRWell detector: The efficiency varies between 98 and 99.5%. The detector shape is drawn on top of the 2D plot. Gas: Ar:CO2 (70:30). Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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Plots describing the performance of the triple-GEM chambers in the slice test. For most time of 2017, the slice test GEMs were not included in CMS running and the operation went almost independent. Therefore plots related to the HV and LV stability of the system and plots related to the calibration of the electronics did not need to be approved by Run Coordination and hence were only approved by the CMS Muon Community in the GMM. At the end of 2017 the GEMs were included in CMS running and CMS triggers were used to make the plots of the delay between the GEM DAQ S-bit and the CMS L1 Accept. These plots were approved by Run Coordination followed by a CMS wide approval.
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 Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C Muon Community (GMM)

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• No RC approval necessary (generic R&D, no data from P5)
• Plots approved in GMM 2017-xx-yy No Slides presented to GMM
• Plots presented in GEM DPG indico link
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## Public Results 2016

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• CMS DOC DB CMS-doc-13494
• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
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• No RC approval necessary (generic R&D, no detectors for P5, no data from P5)
• Plots approved in GMM 2016-02-01 indico link slides pdf
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## Public Results 2015

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## Public Results 2014

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• CMS Detector Performance Note No DP made yet
• Plots approved in WGM 200 2014-09-178 indico link slides pdf
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• No Plots approved in GMM since the meeting at that time was not yet used for Muon-Wide Plot approval
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## Public Results 2010-2013

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Papers / Conference Reports published in 2010-2013: * 2010; https://cds.cern.ch/record/1316084 * 2011; https://cds.cern.ch/record/1401079 * 2012; https://cds.cern.ch/record/1494965 * 2013; https://cds.cern.ch/record/1973272 Dedicated Approval Meetings * ECFA 2013 Plot Approval
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#### Revision 472019-08-20 - ElizabethRoseStarling

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# GEM DPG Public Page

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### GE1/1 Detectors QC Plots for TWEPP2019

Figure Approved by Description
Muon Community (GMM)

TWEPP2019:

<!--StartFragment-->

Efficiency of GE1/1-X-S-PAK-0001, one of the detectors that has already been installed in CMS as part of GE1/1, as obtained from QC8 measurements. VFAT 16 shows an efficiency < 97%. However, this is expected, as it is at the edge of acceptance. We only have 8 eta partitions, and when we reconstruct the hits, we reconstruct them so that it was in the center of the eta partition. So if a track is slightly angled, it gets reconstructed so that the track is straight. However, the superchambers can be slightly off in y from each other. So this messes up the efficiency, and it cannot be corrected for. However, the error bars show that we are still within the realm of acceptability.

<!--EndFragment-->

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 Muon Community (GMM) TWEPP2019: Plot of digis / single hits per strip for GE1/1-X-S-PAK-0001, run 206 of QC8. Showing, with the highest granularity – the firing of the strips. There are several instances (in yellow/orange) which are confirmed as noise by looking at the associated SCurves.
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 Muon Community (GMM) TWEPP2019: Plot of digis / single hits per strip for GE1/1-X-S-PAK-0001, run 206 of QC8. Showing, with the highest granularity – the firing of the strips. There are several instances (in yellow/orange) which are confirmed as noise by looking at the associated SCurves.

 Muon Community (GMM) TWEPP2019: Associated RecHits for the top detectors of Row 1. This plot shows only GE1/1-X-S-PAK-001, in column 1. For a given test chamber (in this case, GE1/1-X-S-PAK-0001), the other chambers in the stand are taken as reference. For a given event, the muon track is reconstructed using the reference chambers, and then extrapolated to the test chamber. The associated RecHit is a verified hit in the test chamber that matches the extrapolation. This allows us to measure the efficiency of the chamber. Each bin is 1mm wide.
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 Muon Community (GMM) TWEPP2019: Box plots of the mean (threshold) for the SCurves of GE1/1-X-S-PAK-0001 QC8 Run 206 Muon Community (GMM) TWEPP2019: Box plot of the sigma (ENC) for the SCurves of GE1/1-X-S-PAK-0001 QC8 Run 206 Muon Community (GMM) TWEPP2019: The hits associated with a reconstructed cosmic muon track for each of the 8 η partitions of GE1/1-X-S-PAK-0001, by cluster size, for QC8 run 206. Muon Community (GMM) TWEPP2019: The total hits associated with a reconstructed cosmic muon track for GE1/1-X-S-PAK-0001, by cluster size, for QC8 run 206.

### Bending Studies for MPGD2019

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#### Revision 462019-08-20 - ElizabethRoseStarling

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# GEM DPG Public Page

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 Muon Community (GMM) Cluster size of GEM rechit in eta partition 7: Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased. [1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3 Muon Community (GMM) Cluster size of GEM rechit in eta partition 8: Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased. [1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3
>
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### GE1/1 Detectors QC Plots for TWEPP2019

Figure Approved by Description
Muon Community (GMM)

TWEPP2019:

<!--StartFragment-->

Efficiency of GE1/1-X-S-PAK-0001, one of the detectors that has already been installed in CMS as part of GE1/1, as obtained from QC8 measurements. VFAT 16 shows an efficiency < 97%. However, this is expected, as it is at the edge of acceptance. We only have 8 eta partitions, and when we reconstruct the hits, we reconstruct them so that it was in the center of the eta partition. So if a track is slightly angled, it gets reconstructed so that the track is straight. However, the superchambers can be slightly off in y from each other. So this messes up the efficiency, and it cannot be corrected for. However, the error bars show that we are still within the realm of acceptability.

<!--EndFragment-->

Muon Community (GMM)

TWEPP2019:

Plot of digis / single hits per strip for GE1/1-X-S-PAK-0001, run 206 of QC8. Showing, with the highest granularity – the firing of the strips. There are several instances (in yellow/orange) which are confirmed as noise by looking at the associated SCurves.

Muon Community (GMM)

TWEPP2019:

Associated RecHits for the top detectors of Row 1. This plot shows only GE1/1-X-S-PAK-001, in column 1. For a given test chamber (in this case, GE1/1-X-S-PAK-0001), the other chambers in the stand are taken as reference. For a given event, the muon track is reconstructed using the reference chambers, and then extrapolated to the test chamber. The associated RecHit is a verified hit in the test chamber that matches the extrapolation. This allows us to measure the efficiency of the chamber. Each bin is 1mm wide.

Muon Community (GMM) TWEPP2019:
Muon Community (GMM) TWEPP2019:
Muon Community (GMM) TWEPP2019:
Muon Community (GMM) TWEPP2019:

### Bending Studies for MPGD2019

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 Muon Community (GMM) LHCC2019: Discharge probability as a function of effective gas gain of GE1/1-X-S-KOREA-0004.: Each discharge event is identified through rapid current change of the HV power supply. A loop antenna is wound around a voltage divider wire to capture the induced signal from the current change in the HV circuit. The measurement is performed with 241Am 5.4 MeV alpha source to induce large primary charge. The discharge probability is fit to exponential form to estimate the probability in low gas gain region. The expected probability at the gain of 104 is ~10-9.

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#### Revision 452019-07-11 - DajeongJeon

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# GEM DPG Public Page

Line: 747 to 747

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#### Revision 442019-05-14 - FedericaMariaSimone

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 META TOPICPARENT name="MuonDPGResults"

# GEM DPG Public Page

Line: 53 to 53

### GE1/1 Detectors QC Plots for MPGD2019

Changed:
<
<
 Muon Community (GMM) MPGD2019: Distribution of parameter that quantifies the gas tightness of a GE1/1 detector. This parameter is the output of the gas leak test. The goal of the gas leak test is to spot possible gas leaks in a GE1/1 detector. The chamber is filled with CO_2 until an over-pressure P_0 = 25 mbar is reached. The test consists in the monitoring of the detector over-pressure in 1 hour. The pressure drop is modeled by the function P(t) = P_0 exp(-t/\tau). The parameter \tau qualifies how fast the overpressure inside the detector decreases as a function of the time. Values of \tau greater than 3 hours guarantee a maximum leak in the gas flow rate around 0.02 l/h. The plot reports the time constant for the 138/144 GE1/1 detectors tested so far. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) Distribution of the output of the HV and linearity test performed on GE1/1 detectors. This test is performed by measuring the the current across the GE1/1 detector while ramping up the HV up to 4.9 kV in pure CO_{2}. The plot shows the deviation between the measured resistance and the resistance extracted from the voltage vs current curve, using the Ohm’s law. At each HV value applied, we compute the resistance using the Ohm’s law. The mean across all the measurements is compared with the measured value. Deviation greater than 3% indicates a loss of linearity and the detector undergoes further investigations. The plot reports the values of the resistance deviation for the 127/144 GE1/1 detectors tested so far. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) Distribution of the intrinsic noise of a GE1/1 detector. The intrinsic noise is measured the rate of the signals induced on the bottom of the third GEM foil while flushing in pure CO2. It is measured as a function of the current drawn through the resistive divider of the high voltage distribution circuit that powers the detector. The effective resistance of the high voltage distribution circuit is 5.0 MOhm in the presence of one external low-pass filter. The resistive divider has a resistance of 4.7 MOhm. The observed signals are termed spurious since they cannot originate from ionizing particles. The maximum intrinsic noise of the GE1/1 chambers is below tents of mHz/cm^2, well below the expected background at the GE1/1 station position in CMS (4.5 kHz/cm^2). The plot reports the values of the spurious signal rate for the 127/144 GE1/1 detectors tested so far. Contact: cms-dpg-conveners-gem@cern.ch
>
>
 Muon Community (GMM) MPGD2019: Distribution of parameter that quantifies the gas tightness of a GE1/1 detector. This parameter is the output of the gas leak test. The goal of the gas leak test is to spot possible gas leaks in a GE1/1 detector. The chamber is filled with CO_2 until an over-pressure P_0 = 25 mbar is reached. The test consists in the monitoring of the detector over-pressure in 1 hour. The pressure drop is modeled by the function P(t) = P_0 exp(-t/\tau). The parameter \tau qualifies how fast the overpressure inside the detector decreases as a function of the time. Values of \tau greater than 3 hours guarantee a maximum leak in the gas flow rate around 0.02 l/h. The plot reports the time constant for the 151 GE1/1 detectors tested so far. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) Distribution of the output of the HV and linearity test performed on GE1/1 detectors. This test is performed by measuring the the current across the GE1/1 detector while ramping up the HV up to 4.9 kV in pure CO_{2}. The plot shows the deviation between the measured resistance and the resistance extracted from the voltage vs current curve, using the Ohm’s law. At each HV value applied, we compute the resistance using the Ohm’s law. The mean across all the measurements is compared with the measured value. Deviation greater than 3% indicates a loss of linearity and the detector undergoes further investigations. The plot reports the values of the resistance deviation for the 143 GE1/1 detectors tested so far. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) Distribution of the intrinsic noise of a GE1/1 detector. The intrinsic noise is measured the rate of the signals induced on the bottom of the third GEM foil while flushing in pure CO2. It is measured as a function of the current drawn through the resistive divider of the high voltage distribution circuit that powers the detector. The effective resistance of the high voltage distribution circuit is 5.0 MOhm in the presence of one external low-pass filter. The resistive divider has a resistance of 4.7 MOhm. The observed signals are termed spurious since they cannot originate from ionizing particles. The maximum intrinsic noise of the GE1/1 chambers is below tents of mHz/cm^2, well below the expected background at the GE1/1 station position in CMS (4.5 kHz/cm^2). The plot reports the values of the spurious signal rate for the 143 GE1/1 detectors tested so far. Contact: cms-dpg-conveners-gem@cern.ch

 Muon Community (GMM) The average effective gas gain distribution is shown for 56 short GE1/1 detectors, flushed with Ar/CO2 (70/30) gas mixture and powered with a nominal fixed drift voltage (3.1 kV). The gain is normalized to the pressure and temperature expected in P5. The 50% contours represent the gain fluctuations above which the detector time resolution is degraded. The plot shows that further optimization of the HV working point is needed in order to allow all the detectors to reach a gain that is closer to the operational value in CMS (10^{4}), that guarantees optimal performance in terms of time resolution and efficiency. –The average effective gas gain of a GE1/1 detector is measured by combining the effective gain measured in one reference sector (sector eta=4, phi=2) as a function of the applied HV and the output of the response uniformity test. –The latter allows to assess the gain of the detector with finer granularity (i.e. every 4 strips, called slice in the following) in one single measurement, by illuminating the whole detector surface with a x-ray beam and recording the charge collected by each slice with analog readout (APV25). This test is performed at fixed applied voltage, well below the expected operating point in CMS in order to avoid the saturation of the electronics. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The average effective gas gain distribution is shown for 76 long GE1/1 detectors, flushed with Ar/CO2 (70/30) gas mixture and powered with a nominal fixed drift voltage (3.1 kV). The gain is normalized to the pressure and temperature expected in P5. The 50% contours represent the gain fluctuations above which the detector time resolution is degraded. The plot shows that further optimization of the HV working point is needed in order to allow all the detectors to reach a gain that is closer to the operational value in CMS (10^{4}), that guarantees optimal performance in terms of time resolution and efficiency. –The average effective gas gain of a GE1/1 detector is measured by combining the effective gain measured in one reference sector (sector eta=4, phi=2) as a function of the applied HV and the output of the response uniformity test. –The latter allows to assess the gain of the detector with finer granularity (i.e. every 4 strips, called slice in the following) in one single measurement, by illuminating the whole detector surface with a x-ray beam and recording the charge collected by each slice with analog readout (APV25). This test is performed at fixed applied voltage, well below the expected operating point in CMS in order to avoid the saturation of the electronics. Contact: cms-dpg-conveners-gem@cern.ch Muon Community (GMM) The average effective gas gain distribution is shown for 56 short GE1/1 detectors, flushed with Ar/CO_{2} (70/30) gas mixture after the procedure of detector pairing that allows to build a super-chamber (SC) and HV point optimization. The detectors in a SC are powered with a single power supply, so it is important to pair detectors with closer gain at fixed HV and to set the optimal HV point that guarantees a uniform behavior of the SC together with the optimal performance of both the detectors in terms of efficiency and time resolution. The reference gain is 10^{4} , a value that corresponds to the nominal operation value in CMS while keeping stable detector performance. The HV point is chosen by sorting the detectors by increasing gain then choosing iteratively the pair of detectors with similar gain and finally calculating the intermediated HV point to set the super-chamber gain to 10^{4}. The gain is normalized to the pressure and temperature expected in P5. The 50% contours represent the gain fluctuations above which the detector time resolution is degraded. Contact: cms-dpg-conveners-gem@cern.ch

#### Revision 432019-05-12 - DajeongJeon

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# GEM DPG Public Page

Line: 32 to 32

## Public Results 2019

>
>

### GE1/1 Slice Test Performance

Figure Approved by Description
Muon Community (GMM)

Detection efficiency of chamber 28 layer 2:

Detection efficiencies of GE1/1 slice test detector 28 layer 2 for muons as a function of η partition (iη= 1~8), measured in a subset of data samples taken in 2018. Each global muon with pT > 20 GeV is extrapolated to the GEM detector to associate with GEM hits. The extrapolated muon is required to be 20 strips away from the edges of the detector. Two η partitions 1 and 2 have a fraction of dead strips at 1.3% and 2.1%, respectively, while no dead strips on iη= 3~8. A larger fraction of strips on iη= 1 and 2 (19.0% and 9.4%) are inactive, mostly due to the higher thresholds applied to the VFAT chips. This applied threshold is cutting the signal charge on each strip (especially at iη= 1), resulted in low detection efficiency for iη= 1 and 2.

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 1:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 2:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 3:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 4:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 5:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 6:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 7:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

Muon Community (GMM)

Cluster size of GEM rechit in eta partition 8:

Distributions of strip multiplicities of GEM hit cluster associated to global muons with pT > 20 GeV on the η partitions of detector 28 layer 2, measured in a subset of data samples taken in 2018. The cluster size is consistent with a test beam expectation [1], except for iη= 1 and 2. The higher thresholds at the strip level on iη= 1 and 2 are cutting the signal charge on each strip, causing the real strip multiplicity distributions to be biased.

[1] "CMS TECHNICAL DESIGN REPORT FOR THE MUON ENDCAP GEM UPGRADE", CERN-LHCC-2015-012, CMS-TDR-013, ISBN 978-92-9083-396-3

### Bending Studies for MPGD2019

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>
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#### Revision 422019-05-03 - RosamariaVenditti

Line: 1 to 1

 META TOPICPARENT name="MuonDPGResults"

# GEM DPG Public Page

Line: 38 to 37

Figure Approved by Description
Muon Community (GMM) *The visualized output from the initial set off bending data, collected with the laser equipped bending stand and associated gain variations for GE1/1-X-S-INDIA-0007 chamber. The left figure represents bending distributions measured on the readout board, while right shows average effective gain at given sector
Changed:
<
<
>
>

### GE1/1 Detectors QC Plots for MPGD2019

Figure Approved by Description
Muon Community (GMM)

MPGD2019:

Distribution of parameter that quantifies the gas tightness of a GE1/1 detector. This parameter is the output of the gas leak test. The goal of the gas leak test is to spot possible gas leaks in a GE1/1 detector. The chamber is filled with CO_2 until an over-pressure P_0 = 25 mbar is reached. The test consists in the monitoring of the detector over-pressure in 1 hour. The pressure drop is modeled by the function P(t) = P_0 exp(-t/\tau). The parameter \tau qualifies how fast the overpressure inside the detector decreases as a function of the time. Values of \tau greater than 3 hours guarantee a maximum leak in the gas flow rate around 0.02 l/h. The plot reports the time constant for the 138/144 GE1/1 detectors tested so far.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

Distribution of the output of the HV and linearity test performed on GE1/1 detectors. This test is performed by measuring the the current across the GE1/1 detector while ramping up the HV up to 4.9 kV in pure CO_{2}. The plot shows the deviation between the measured resistance and the resistance extracted from the voltage vs current curve, using the Ohm’s law. At each HV value applied, we compute the resistance using the Ohm’s law. The mean across all the measurements is compared with the measured value. Deviation greater than 3% indicates a loss of linearity and the detector undergoes further investigations. The plot reports the values of the resistance deviation for the 127/144 GE1/1 detectors tested so far.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

Distribution of the intrinsic noise of a GE1/1 detector. The intrinsic noise is measured the rate of the signals induced on the bottom of the third GEM foil while flushing in pure CO2. It is measured as a function of the current drawn through the resistive divider of the high voltage distribution circuit that powers the detector. The effective resistance of the high voltage distribution circuit is 5.0 MOhm in the presence of one external low-pass filter. The resistive divider has a resistance of 4.7 MOhm. The observed signals are termed spurious since they cannot originate from ionizing particles. The maximum intrinsic noise of the GE1/1 chambers is below tents of mHz/cm^2, well below the expected background at the GE1/1 station position in CMS (4.5 kHz/cm^2). The plot reports the values of the spurious signal rate for the 127/144 GE1/1 detectors tested so far.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

The average effective gas gain distribution is shown for 56 short GE1/1 detectors, flushed with Ar/CO2 (70/30) gas mixture and powered with a nominal fixed drift voltage (3.1 kV). The gain is normalized to the pressure and temperature expected in P5. The 50% contours represent the gain fluctuations above which the detector time resolution is degraded. The plot shows that further optimization of the HV working point is needed in order to allow all the detectors to reach a gain that is closer to the operational value in CMS (10^{4}), that guarantees optimal performance in terms of time resolution and efficiency.

–The average effective gas gain of a GE1/1 detector is measured by combining the effective gain measured in one reference sector (sector eta=4, phi=2) as a function of the applied HV and the output of the response uniformity test.

–The latter allows to assess the gain of the detector with finer granularity (i.e. every 4 strips, called slice in the following) in one single measurement, by illuminating the whole detector surface with a x-ray beam and recording the charge collected by each slice with analog readout (APV25). This test is performed at fixed applied voltage, well below the expected operating point in CMS in order to avoid the saturation of the electronics.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

The average effective gas gain distribution is shown for 76 long GE1/1 detectors, flushed with Ar/CO2 (70/30) gas mixture and powered with a nominal fixed drift voltage (3.1 kV). The gain is normalized to the pressure and temperature expected in P5. The 50% contours represent the gain fluctuations above which the detector time resolution is degraded. The plot shows that further optimization of the HV working point is needed in order to allow all the detectors to reach a gain that is closer to the operational value in CMS (10^{4}), that guarantees optimal performance in terms of time resolution and efficiency.

–The average effective gas gain of a GE1/1 detector is measured by combining the effective gain measured in one reference sector (sector eta=4, phi=2) as a function of the applied HV and the output of the response uniformity test.

–The latter allows to assess the gain of the detector with finer granularity (i.e. every 4 strips, called slice in the following) in one single measurement, by illuminating the whole detector surface with a x-ray beam and recording the charge collected by each slice with analog readout (APV25). This test is performed at fixed applied voltage, well below the expected operating point in CMS in order to avoid the saturation of the electronics.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

The average effective gas gain distribution is shown for 56 short GE1/1 detectors, flushed with Ar/CO_{2} (70/30) gas mixture after the procedure of detector pairing that allows to build a super-chamber (SC) and HV point optimization.

The detectors in a SC are powered with a single power supply, so it is important to pair detectors with closer gain at fixed HV and to set the optimal HV point that guarantees a uniform behavior of the SC together with the optimal performance of both the detectors in terms of efficiency and time resolution.

The reference gain is 10^{4} , a value that corresponds to the nominal operation value in CMS while keeping stable detector performance.

The HV point is chosen by sorting the detectors by increasing gain then choosing iteratively the pair of detectors with similar gain and finally calculating the intermediated HV point to set the super-chamber gain to 10^{4}.

The gain is normalized to the pressure and temperature expected in P5.

The 50% contours represent the gain fluctuations above which the detector time resolution is degraded.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

The average effective gas gain distribution is shown for 76 long GE1/1 detectors, flushed with Ar/CO_{2} (70/30) gas mixture after the procedure of detector pairing that allows to build a super-chamber (SC) and HV point optimization.

The detectors in a SC are powered with a single power supply, so it is important to pair detectors with closer gain at fixed HV and to set the optimal HV point that guarantees a uniform behavior of the SC together with the optimal performance of both the detectors in terms of efficiency and time resolution.

The reference gain is 10^{4}, a value that corresponds to the nominal operation value in CMS while keeping stable detector performance.

The HV point is chosen by sorting the detectors by increasing gain then choosing iteratively the pair of detectors with similar gain and finally calculating the intermediated HV point to set the super-chamber gain to 10^{4}.

The gain is normalized to the pressure and temperature expected in P5.

The 50% contours represent the gain fluctuations above which the detector time resolution is degraded.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

The average effective gas gain distribution is shown for short GE1/1 detectors, flushed with Ar/CO2 (70/30) gas mixture, before (yellow) and after (blue) the procedure of detector pairing that allows to build a super-chamber (SC).

The detectors in the SC are powered with the same HV, so it is crucial to set the optimal HV point that guarantees a uniform behavior of the SC. The HV point is chosen by sorting the detectors by increasing value of the gain, then choosing the couple of detectors with similar gain. Finally the intermediated HV point that ensures a super-chamber gain of 10^4 is computed.

The gain is normalized to the pressure and temperature expected in P5.

The 50% contours represent the fluctuations of the gain before (orange) and after (azure) the pairing procedure. Above this limit, the the detector time resolution starts to be degraded.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

The average effective gas gain distribution is shown for long GE1/1 detectors, flushed with Ar/CO2 (70/30) gas mixture, before (yellow) and after (blue) the procedure of detector pairing that allows to build a super-chamber (SC).

The detectors in the SC are powered with the same HV, so it is crucial to set the optimal HV point that guarantees a uniform behavior of the SC. The HV point is chosen by sorting the detectors by increasing value of the gain, then choosing the couple of detectors with similar gain. Finally the intermediated HV point that ensures a super-chamber gain of 10^4 is computed.

The gain is normalized to the pressure and temperature expected in P5.

The 50% contours represent the fluctuations of the gain before (orange) and after (azure) the pairing procedure. Above this limit, the the detector time resolution starts to be degraded.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

Distribution of the HV applied to the GE1/1 super-chambers in order to obtain a fixed gain close to the operating condition in CMS (i.e. gain ~ 10^4). The HV point for each GE1/1 detector is computed by sorting the detectors by increasing gain (the gain being measured at fixed HV point) then iteratively choosing the pair with nearby gain values.

Finally the intermediated HV that ensures a gain around 10^4 is computed.

Contact: cms-dpg-conveners-gem@cern.ch

Muon Community (GMM)

Distribution of the response uniformity of the GE1/1 detectors (short and long), taken at fixed applied HV and normalized to the pressure and temperature expected in P5. The response uniformity is proportional to the gain variation across the whole detector area, so it is taken as a measurement of the gain fluctuation in a GE1/1 detector. The 50% contours represent the gain fluctuations above which the the detector time resolution starts to be degraded.

The measurement is performed by uniformly illuminating the detector with a x-ray beam of known energy and ideally dividing the detector in groups of 4 strips (slice). For each slice, the ADC spectrum is recorded with analog electronics. The spectrum is a convolution of the copper fluorescence photo-peak and electron bremsstrahlung background.

By extracting the copper photo-peak position from each slices and assigning it to the slice coordinates, one can extract the variation of the response across the whole detector surface. The distribution of the copper photo-peak positions is fit to extract mean (µ) and sigma (s) and define the response uniformity as

RU= (s/µ) * 100%

This test is performed at fixed applied voltage, well below the expected operating point in CMS in order to avoid the saturation of the electronics.

Contact: cms-dpg-conveners-gem@cern.ch

### Event display with ISpy for GEM slice test

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#### Revision 412019-05-02 - MarekMichalGruchala

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# GEM DPG Public Page

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### Bending Studies for MPGD2019

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 Muon Community (GMM) *The visualized output from the initial set off bending data, collected with the laser equipped bending stand and associated gain variations for GE1/1-X-S-INDIA-0007 chamber. The left figure represents bending distributions measured on the readout board, while right shows average effective gain at given sector

### Event display with ISpy for GEM slice test

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#### Revision 402019-05-02 - MarekMichalGruchala

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# GEM DPG Public Page

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## Public Results 2019

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### Bending Studies for MPGD2019

Figure Approved by Description
Muon Community (GMM) *The visualized output from the initial set off bending data, collected with the laser equipped bending stand and associated gain variations for GE1/1-X-S-INDIA-0007 chamber. The left figure represents bending distributions measured on the readout board, while right shows average effective gain at given sector

### Event display with ISpy for GEM slice test

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#### Revision 392019-03-14 - DajeongJeon

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# GEM DPG Public Page

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## Public Results 2019

>
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### Event display with ISpy for GEM slice test

Figure Approved by Description
Muon Community (GMM) Event display with full 3D CMS model: LHC pp collision event display in a perspective view showing two muons (the red lines), associated with hits on one of the five GE1/1 slice test super-chambers (blue trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=34.01 GeV, η=-0.540) and muon (pT=37.63 GeV, η=-1.985) has a combined invariant mass of 91.14 GeV.
Muon Community (GMM) Event display with full 3D CMS model (transparent): LHC pp collision event display in a perspective view showing two muons (the red lines), associated with hits on one of the five GE1/1 slice test super-chambers (light purple trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=34.01 GeV, η=-0.540) and muon (pT=37.63 GeV, η=-1.985) has a combined invariant mass of 91.14 GeV.
Muon Community (GMM) Event display with half of CMS model: LHC pp collision event display in a perspective view showing two muons (the red lines), associated with hits on one of the five GE1/1 slice test super-chambers (blue trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=34.01 GeV, η=-0.540) and muon (pT=37.63 GeV, η=-1.985) has a combined invariant mass of 91.14 GeV.
Muon Community (GMM) Event display with half of CMS model with close up view on GEM Rechit: LHC pp collision event display in a close up view showing two muons (the red lines) and its associated hits (GEM:purple CSC:green) on one of the five GE1/1 slice test super-chambers (light purple trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=34.01 GeV, η=-0.540) and muon (pT=37.63 GeV, η=-1.985) has a combined invariant mass of 91.14 GeV.
Muon Community (GMM) Event display with full 3D CMS model with close up view on GEM Rechit: LHC pp collision event display in a close up view showing two muons (the red lines) and its associated hits (GEM:purple CSC:green) on one of the five GE1/1 slice test super-chambers (light purple trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=34.01 GeV, η=-0.540) and muon (pT=37.63 GeV, η=-1.985) has a combined invariant mass of 91.14 GeV.
Muon Community (GMM) Event display with full 3D CMS model: LHC pp collision event display in a perspective view showing two muons (the red lines), associated with hits on one of the five GE1/1 slice test super-chambers (blue trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=30.11 GeV, η=-1.956) and muon (pT=53.60 GeV, η=-1.993) has a combined invariant mass of 3.01 GeV.
Muon Community (GMM) Event display with full 3D CMS model (transparent): LHC pp collision event display in a perspective view showing two muons (the red lines), associated with hits on one of the five GE1/1 slice test super-chambers (light purple trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=30.11 GeV, η=-1.956) and muon (pT=53.60 GeV, η=-1.993) has a combined invariant mass of 3.01 GeV.
Muon Community (GMM) Event display with half of CMS model: LHC pp collision event display in a perspective view showing two muons (the red lines), associated with hits on one of the five GE1/1 slice test super-chambers (blue trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=30.11 GeV, η=-1.956) and muon (pT=53.60 GeV, η=-1.993) has a combined invariant mass of 3.01 GeV.
Muon Community (GMM) Event display with half of CMS model with close up view on GEM Rechit: LHC pp collision event display in a close up view showing two muons (the red lines) and its associated hits (GEM:purple CSC:green) on one of the five GE1/1 slice test super-chambers (light purple trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=30.11 GeV, η=-1.956) and muon (pT=53.60 GeV, η=-1.993) has a combined invariant mass of 3.01 GeV.
Muon Community (GMM) Event display with full 3D CMS model with close up view on GEM Rechit: LHC pp collision event display in a close up view showing two muons (the red lines) and its associated hits (GEM:purple CSC:green) on one of the five GE1/1 slice test super-chambers (light purple trapezoidal boxes) at station 1 of the endcap muon system. The antimuon (pT=30.11 GeV, η=-1.956) and muon (pT=53.60 GeV, η=-1.993) has a combined invariant mass of 3.01 GeV.

### Advanced Aging Study on Triple-GEM plots for LHCC 2019 poster session

• Plots approved in GEM-DPG meeting 2019-02-07 indico link

#### Revision 382019-03-14 - DajeongJeon

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# GEM DPG Public Page

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#### Revision 372019-02-28 - DavideFiorina

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# GEM DPG Public Page

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## Template for future use

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## Public Results 2019

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### Advanced Aging Study on Triple-GEM plots for LHCC 2019 poster session

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Figure Description
*LHCC2019: The plot shows the measured values of the Effective Gas Gain of the Triple-GEM prototype under test as a function of the Divider Current. The gain is calculated as: 𝑮=𝑰_𝒂𝒏/(𝒆 𝒏_𝟎 𝑹), where 𝑰_𝒂𝒏: anodic current, e: electron charge, 𝒏_𝟎: number of primaries, R: rate at the maximum efficiency. Gain difference in the two sectors is due to the hole in the drift plane which distorts the electric field.
*LHCC2019: The plot shows the Hit Rate of the Triple-GEM prototype irradiated with a 55Fe source in function of the Divider Current. Rate in the alpha sector is lower because of the hole in the drift plane, resulting in less photon converted in the drift gap. The aim of this measurement is to identify the best workink point.
*LHCC2019: The plot shows the charge spectrum obtained by the Single-Wire Proportional Chamber irradiated with a 55Fe source. Three peaks are visible: 1) Pedestal peak, 2) Argon Escape peak (≈3 keV), 55Fe photopeak (5.9 keV). The fit permits to monitor the Gain value (via peak position with respect to pedestal peak) and the Energy resolution of the Wire Chamber.
*LHCC2019: The plot shows the charge spectrum obtained by the Triple-GEM prototype irradiated with a 55Fe source. Three peaks are visible: 1) Pedestal peak, 2) Argon Escape peak (≈3 keV), 55Fe photopeak (5.9 keV). The fit permits to monitor the Gain value (via peak position with respect to pedestal peak) and the Energy resolution of the GEM detector.
*LHCC2019: The plot shows the charge spectrum obtained by the Triple-GEM prototype irradiated with a 241Am source. Three peaks are visible: 1)Pedestal peak 2) Two peaks due to the many alpha decay channels (http://nucleardata.nuclear.lu.se/toi/nuclide.asp?iZA=950241). The fit permits to monitor the Gain value (via peak position with respect to the zero peak) and the Energy resolution of the GEM Detector.
*LHCC2019: The plot shows the integrated charge in the Triple-GEM Sector (X-rays Sector) irradiated with a 55Fe source. Different slopes refer to different 55Fe source attenuations.
*LHCC2019: The plot shows the integrated charge in the Triple-GEM Sector (α Sector) irradiated with a 241Am source. Different slopes are due to different calibration factors.
*LHCC2019: The plot shows Normalized (to the initial value) and Corrected (for the environmental fluctuations) Gain values of the Single Wire Proportional Chamber. The Gain dropped about to 20% of the initial value.
*LHCC2019: The plot shows Normalized (to the initial value) and Corrected (for the environmental fluctuations) Gain values of the X-ray Sector of the Triple-GEM detector.
*LHCC2019: The plot shows Normalized (to the initial value) and Corrected (for the environmental fluctuations) Gain values of the α Sector of the Triple-GEM detector.
*LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. No Silicon traces means no polymer deposit.
*LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. No Silicon traces means no polymer deposit.
*LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. No Silicon traces means no polymer deposit.
*LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. Silicon traces means that some polymers start to deposit.
*LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. Silicon traces means that some polymers start to deposit.
*LHCC2019: The plot shows the percentage concentration of some of the main atomic components of a GEM foil as a function of the distance from the hole edge (The variable Position increases as the distance from the hole decreases). Fluctuations in the percentage concentrations are due to hole imperfections. Silicon traces means that some polymers start to deposit.

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 Muon Community (GMM) LHCC2019: QC5 gain uniformity plot of GE1/1-X-S-KOREA-0004 detector: To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 12.8%. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) LHCC2019: Aging test of GE1/1-X-S-KOREA-0001 detector: Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from 137Cs for 2500 hour continuously. No gain drop due to aging effect is observed up to 66mC/cm2. It corresponds to 217 years of GE2/1 and 2.3 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) LHCC2019: Effective gas gains before and after discharges as a function of divider current: Consistency of the effective gas gains before and after discharges is shown. Even after 229 discharges there is no significant degradation on the detector performance. The small difference in the gain can be understood as effect from change of enviromental parameters - pressure and temperature. The effective gas gains are calibrated using 55Fe x-ray source and the discharge test is performed using 241Am 5.4 MeV alpha source. Muon Community (GMM) LHCC2019: ADC spectra of GE1/1-X-S-KOREA-0004 detector before and after discharge: Consistent energy resolution of the detector before and after discharges is shown. Even after 229 discharges there is no significant degradation on the detector performance. The difference of peak position can be understood as effect from change of enviromental parameters - pressure and temperature. 55Fe x-ray source is used for the measurement and the discharge test is performed using 241Am 5.4 MeV alpha source. The spectra are fit to two gaussian functions for the peaks and 5th polynomial for the backgrouds. Muon Community (GMM) LHCC2019: Discharge probability as a function of effective gas gain of GE1/1-X-S-KOREA-0004.: Each discharge event is identified through rapid current change of the HV power supply. A loop antenna is wound around a voltage divider wire to capture the induced signal from the current change in the HV circuit. The measurement is performed with 241Am 5.4 MeV alpha source to induce large primary charge. The discharge probability is fit to exponential form to estimate the probability in low gas gain region. The expected probability at the gain of 104 is ~10-9.

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 Muon Community (GMM) LHCC2019: Response Uniformity of GE1/1 chambers tested in Aachen. To measure the gas gain the standard QC5 methodology for GE1/1 production is used. The standard deviation of the gain distribution is used as a measure for the response uniformity.

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## Public Results 2018

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 Muon Community (GMM) *IEEE2018: This plot shows the position of the interactions undergone by neutrons in the Triple-GEM detector. It’s clear that, as expected, the regions with higher interaction number are the readout board and the shielding PCB placed on top of the detector. Some interactions also occurs in the GEM foils themselves. In the gas gaps instead the interaction probability for neutrons is much lower. In the plot with the aluminum support, a peak due to the presence of the support itself can be identified at z = 12.5 mm. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding. The simulated geometry includes the detector and the aluminum support used during the actual test.

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 Muon Community (GMM) ICHEP2018: Aging test of GE1/1-S-X-KOREA-0001 detector. Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from Cs 137 for 1300 hour continuously. No gain drop due to aging effect is observed up to 34mC/cm^2. It corresponds to 113 years of GE2/1 and 1.2 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.

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 Muon Community (GMM) CHEP2018: Total energy deposited by gamma. The plots show the total energy deposited into the different gaps by a gamma hitting the detector, as a function of the energy of the gamma itself. This number doesn’t include only the energy lost by ionization, but all the energy deposited in each process that the particle undergone. For this reason, this is not optimal for the calculation of the number of primaries produced in the interaction, because it would give an overestimation. The frequency on the z axis is obtained by dividing the number of events in which the gamma deposits a certain amount of energy by the number of gamma generated for each energy bin in the simulation (10^6). Interesting is the fact that, while for neutrons (previous plot) the energy deposited reaches values up to 1 MeV, for photons the maximus is of the order of 100 keV. The irradiation position is R3 while CuCIIC is the shielding configuration used, i.e. Cu target, then 1 concrete shielding plus 2 iron shieldings plus another concrete shielding.

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 Muon Community (GMM) QC5 gain uniformity plot of GE2/1-M4detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) Example of the QC5 gain curve output: Typical effective gain curve obtained during the GE1/1 quality control. I_divider is the current flowing through the HV resistive divider that provide potential to the detector electrodes. P0 and T0 corrections parameter are determined by averaging the temperature and pressure conditions in the P5 cavern. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) X-ray Ray Aging Test - Weekly Energy Resolution Measurements: Result of the X-ray Triple-GEM aging test showing the energy resolution as a function of the accumulated charge. The detector under test is a GE1/1-X-S-CERN-0002 chamber operating in Ar/CO2 (70:30) at an initial gas gain of 2X10^4. The energy spectrum of the 109Cd source was measured every weeks and the corresponding energy resolution stays stable during the entire test. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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## Public Results 2017

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• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
• Slice Test Talk Michele in WGM 335 2017-11-16 indico link Note that this is not an approval talk
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 Muon Community (GMM) Title: Description (missing). Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Other formats: pdf

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 Muon Community (GMM) Efficiency across the GE2/1 M4 μRWell detector: The efficiency varies between 98 and 99.5%. The detector shape is drawn on top of the 2D plot. Gas: Ar:CO2 (70:30). Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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Plots describing the performance of the triple-GEM chambers in the slice test. For most time of 2017, the slice test GEMs were not included in CMS running and the operation went almost independent. Therefore plots related to the HV and LV stability of the system and plots related to the calibration of the electronics did not need to be approved by Run Coordination and hence were only approved by the CMS Muon Community in the GMM. At the end of 2017 the GEMs were included in CMS running and CMS triggers were used to make the plots of the delay between the GEM DAQ S-bit and the CMS L1 Accept. These plots were approved by Run Coordination followed by a CMS wide approval.
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 Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C Muon Community (GMM)

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• No RC approval necessary (generic R&D, no data from P5)
• Plots approved in GMM 2017-xx-yy No Slides presented to GMM
• Plots presented in GEM DPG indico link
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## Public Results 2016

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• CMS DOC DB CMS-doc-13494
• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
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• Plots approved in GMM 2016-02-01 indico link slides pdf
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## Public Results 2015

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## Public Results 2014

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• CMS Detector Performance Note No DP made yet
• Plots approved in WGM 200 2014-09-178 indico link slides pdf
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• No Plots approved in GMM since the meeting at that time was not yet used for Muon-Wide Plot approval
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## Public Results 2010-2013

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Papers / Conference Reports published in 2010-2013: * 2010; https://cds.cern.ch/record/1316084 * 2011; https://cds.cern.ch/record/1401079 * 2012; https://cds.cern.ch/record/1494965 * 2013; https://cds.cern.ch/record/1973272 Dedicated Approval Meetings * ECFA 2013 Plot Approval
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 META FILEATTACHMENT attachment="Discharge_Hardness_Korean_Foil_Gain.png" attr="" comment="KOREA GEM foil result for LHCC2019 poster sessions" date="1551198384" name="Discharge_Hardness_Korean_Foil_Gain.png" path="Discharge_Hardness_Korean_Foil_Gain.png" size="72323" user="jhchoi" version="1" attachment="Discharge_Hardness_Korean_Foil_ADC.png" attr="" comment="KOREA GEM foil result for LHCC2019 poster sessions" date="1551198384" name="Discharge_Hardness_Korean_Foil_ADC.png" path="Discharge_Hardness_Korean_Foil_ADC.png" size="94311" user="jhchoi" version="1" attachment="Discharge_Korean_Foil_Probability.png" attr="" comment="KOREA GEM foil result for LHCC2019 poster sessions" date="1551198384" name="Discharge_Korean_Foil_Probability.png" path="Discharge_Korean_Foil_Probability.png" size="73082" user="jhchoi" version="1"
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 META FILEATTACHMENT attachment="alpha_spectra_example3.png" attr="" comment="241Am Charge Spectrum with The Triple-GEM Prototype" date="1551374975" name="alpha_spectra_example3.png" path="alpha_spectra_example3.png" size="46062" user="dfiorina" version="1" attachment="EDS_Alpha_Bottom3.png" attr="" comment="EDS Analysis of a GEM hole from the Î± Sector bottom layer" date="1551374976" name="EDS_Alpha_Bottom3.png" path="EDS_Alpha_Bottom3.png" size="51258" user="dfiorina" version="1" attachment="EDS_Alpha_Top3.png" attr="" comment="EDS Analysis of a GEM hole from the Î± Sector top layer" date="1551374978" name="EDS_Alpha_Top3.png" path="EDS_Alpha_Top3.png" size="51359" user="dfiorina" version="1" attachment="Gain_vs_Divider_Current3.png" attr="" comment="Detector Gain Calibration" date="1551375010" name="Gain_vs_Divider_Current3.png" path="Gain_vs_Divider_Current3.png" size="46298" user="dfiorina" version="1" attachment="EDS_Ref_Top3.png" attr="" comment="EDS Analysis of a GEM hole from a Non-Irradiated Sector top layer" date="1551374982" name="EDS_Ref_Top3.png" path="EDS_Ref_Top3.png" size="44736" user="dfiorina" version="1" attachment="EDS_Xray_Bottom3.png" attr="" comment="EDS Analysis of a GEM hole from the X-rays Sector bottom layer" date="1551374983" name="EDS_Xray_Bottom3.png" path="EDS_Xray_Bottom3.png" size="48425" user="dfiorina" version="1" attachment="EDS_Xray_Top3.png" attr="" comment="EDS Analysis of a GEM hole from the X-ray Sector top layer" date="1551374986" name="EDS_Xray_Top3.png" path="EDS_Xray_Top3.png" size="49211" user="dfiorina" version="1" attachment="Special_Aging_Test_Alpha4.png" attr="" comment="GEM Î± Sector Normalized and Corrected Gain Evolution" date="1551375078" name="Special_Aging_Test_Alpha4.png" path="Special_Aging_Test_Alpha4.png" size="29956" user="dfiorina" version="1" attachment="IntCharge_Alpha3.png" attr="" comment="Charge Collected by the Î± Sector" date="1551375072" name="IntCharge_Alpha3.png" path="IntCharge_Alpha3.png" size="46772" user="dfiorina" version="1" attachment="IntCharge_Xrays3.png" attr="" comment="Charge Collected by the X-ray Sector" date="1551375074" name="IntCharge_Xrays3.png" path="IntCharge_Xrays3.png" size="48723" user="dfiorina" version="1" attachment="Rate_vs_Divider_Current3.png" attr="" comment="Rate as function of the divider current" date="1551375075" name="Rate_vs_Divider_Current3.png" path="Rate_vs_Divider_Current3.png" size="40822" user="dfiorina" version="1" attachment="Xrays_spectra_example3.png" attr="" comment="55 Fe Charge Spectrum with The Triple-GEM Prototype" date="1551375260" name="Xrays_spectra_example3.png" path="Xrays_spectra_example3.png" size="47105" user="dfiorina" version="1" attachment="Special_Aging_Test_SWPC4.png" attr="" comment="Wire Chamber Normalized and Corrected Gain Evolution" date="1551375258" name="Special_Aging_Test_SWPC4.png" path="Special_Aging_Test_SWPC4.png" size="29835" user="dfiorina" version="1" attachment="SWPC_spectra_example3.png" attr="" comment="55 Fe Charge Spectrum with The Single Wire Proportional Chamber" date="1551375259" name="SWPC_spectra_example3.png" path="SWPC_spectra_example3.png" size="46573" user="dfiorina" version="1"

#### Revision 362019-02-26 - JunhoChoi

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## Public Results 2019

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Figure Approved by Description
Muon Community (GMM) LHCC2019: QC5 gain uniformity plot of GE1/1-X-S-KOREA-0004 detector: To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 12.8%. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.
Muon Community (GMM) LHCC2019: Aging test of GE1/1-X-S-KOREA-0001 detector: Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from 137Cs for 2500 hour continuously. No gain drop due to aging effect is observed up to 66mC/cm2. It corresponds to 217 years of GE2/1 and 2.3 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.
Muon Community (GMM) LHCC2019: Effective gas gains before and after discharges as a function of divider current: Consistency of the effective gas gains before and after discharges is shown. Even after 229 discharges there is no significant degradation on the detector performance. The small difference in the gain can be understood as effect from change of enviromental parameters - pressure and temperature. The effective gas gains are calibrated using 55Fe x-ray source and the discharge test is performed using 241Am 5.4 MeV alpha source.
Muon Community (GMM) LHCC2019: ADC spectra of GE1/1-X-S-KOREA-0004 detector before and after discharge: Consistent energy resolution of the detector before and after discharges is shown. Even after 229 discharges there is no significant degradation on the detector performance. The difference of peak position can be understood as effect from change of enviromental parameters - pressure and temperature. 55Fe x-ray source is used for the measurement and the discharge test is performed using 241Am 5.4 MeV alpha source. The spectra are fit to two gaussian functions for the peaks and 5th polynomial for the backgrouds.
Muon Community (GMM) LHCC2019: Discharge probability as a function of effective gas gain of GE1/1-X-S-KOREA-0004.: Each discharge event is identified through rapid current change of the HV power supply. A loop antenna is wound around a voltage divider wire to capture the induced signal from the current change in the HV circuit. The measurement is performed with 241Am 5.4 MeV alpha source to induce large primary charge. The discharge probability is fit to exponential form to estimate the probability in low gas gain region. The expected probability at the gain of 104 is ~10-9.

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• Plots approved in GEM-DPG meeting 2019-02-14 indico link
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#### Revision 352019-02-20 - TerukiKamon

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#### Revision 342019-02-19 - HenningKeller

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## Template for future use

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Figure Approved by Description
Muon Community (GMM) LHCC2019:

Leakage test results of GE1/1 detectors tested in Aachen. During the test, the detector is set to an overpressure of 25 mbar and the system is closed for one hour. The leak parameter tau is defined by fitting the pressure vs time curve with P(t)=P0*exp(-t/tau), where P0 is a constant.

Muon Community (GMM) LHCC2019:

Effective Gas Gain of tested GE1/1 chambers. To measure the gas gain the standard QC5 methodology for GE1/1 production is used. The error bars represent the standard deviation of the gain distribution of the entire chamber, while the triangles show the extrema of that distribution.

Muon Community (GMM) LHCC2019:

Response Uniformity of GE1/1 chambers tested in Aachen. To measure the gas gain the standard QC5 methodology for GE1/1 production is used. The standard deviation of the gain distribution is used as a measure for the response uniformity.

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 Muon Community (GMM) *LHCC2019: Distribution of sigma values extracted from two different scurve measurements. The red points represent the sigma (i.e. the ENC) measured with the VFAT3 connectors plugged on detector readout, the black points represent the sigma measured with the VFAT3 disconnected from the readout. In both cases the VFAT is connected to the GEB for powering and data taking. Depending the ENC on the input capacitance seen by the VFAT input channel, the plot shows a clear separation of the sigma values between the «Zero input capacitance» and the «GE1/1 capacitance» cases. The detector used was the GE11-X-S-CERN-0011 and the ASIC was set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. Muon Community (GMM) *LHCC2019: 2-D view of the scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-S-CERN-0011 operated in Ar/CO2 70/30 at voltage: Vdrift= 756 V, G1 = 378 V, Vtransfer1= 294 V, G2 = 370 V, Vtransfer2= 588 V, G3 = 352 V, Vind= 420 V, corresponding to an effective gain G = 1 x 10^4. The ASIC was installed on the readout sector 10 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The s-curve measurement was taken in normal operation. Muon Community (GMM) *LHCC2019: 2-D view of the scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-S-CERN-0011 operated in Ar/CO2 70/30 at voltage: Vdrift= 756 V, G1 = 378 V, Vtransfer1= 294 V, G2 = 370 V, Vtransfer2= 588 V, G3 = 352 V, V_{ind} = 420 V, corresponding to an effective gain G = 1 x 10^4. The ASIC was installed on the readout sector 10 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The s-curve measurement was taken after an unexpected discharge occurred in the detector. Empty scurves indicate that the channel is no longer responding, narrow sigma scurve indicate that the channel is disconnected from the strip (Low ENC compatible with zero input capacitance). The damage caused an increase in noise in the remaining channels. Muon Community (GMM) *LHCC2019: 2-D view of scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-L-CERN-0002 operated in Ar/CO2 70/30 at voltage: Vdrift= 743 V, G1 = 370 V, Vtransfer1 = 290 V, G2 = 363 V, Vtransfer2 = 578 V, G3 = 395 V, Vind= 412 V. The ASIC was installed on the readout sector 15 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The s-curve measurement was taken in normal operation. Muon Community (GMM) *LHCC2019: 2-D view of scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-L-CERN-0002 operated in Ar/CO2 70/30 at voltage: Vdrift= 743 V, G1 = 370 V, Vtransfer1 = 290 V, G2 = 363 V, Vtransfer2 = 578 V, G3 = 395 V, Vind= 412 V. The ASIC was installed on the readout sector 15 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The readout sector 15 was partially irradiated with an alpha source (Am241), from strip 57 to 70 approx. The s-curve measurement has been taken after a discharge occurred in the detector. Empty scurvesindicate that the channel is no longer responding, narrow sigma scurveindicate that the channel is disconnected from the strip (low ENC compatible with zero input capacitance).
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 Muon Community (GMM) *LHCC2019: Distribution of sigma values extracted from two different scurve measurements. The red points represent the sigma (i.e. the ENC) measured with the VFAT3 connectors plugged on detector readout, the black points represent the sigma measured with the VFAT3 disconnected from the readout. In both cases the VFAT is connected to the GEB for powering and data taking. Depending the ENC on the input capacitance seen by the VFAT input channel, the plot shows a clear separation of the sigma values between the «Zero input capacitance» and the «GE1/1 capacitance» cases. The detector used was the GE11-X-S-CERN-0011 and the ASIC was set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. Muon Community (GMM) *LHCC2019: 2-D view of the scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-S-CERN-0011 operated in Ar/CO2 70/30 at voltage: Vdrift= 756 V, G1 = 378 V, Vtransfer1= 294 V, G2 = 370 V, Vtransfer2= 588 V, G3 = 352 V, Vind= 420 V, corresponding to an effective gain G = 1 x 10^4. The ASIC was installed on the readout sector 10 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The s-curve measurement was taken in normal operation. Muon Community (GMM) *LHCC2019: 2-D view of the scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-S-CERN-0011 operated in Ar/CO2 70/30 at voltage: Vdrift= 756 V, G1 = 378 V, Vtransfer1= 294 V, G2 = 370 V, Vtransfer2= 588 V, G3 = 352 V, V_{ind} = 420 V, corresponding to an effective gain G = 1 x 10^4. The ASIC was installed on the readout sector 10 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The s-curve measurement was taken after an unexpected discharge occurred in the detector. Empty scurves indicate that the channel is no longer responding, narrow sigma scurve indicate that the channel is disconnected from the strip (Low ENC compatible with zero input capacitance). The damage caused an increase in noise in the remaining channels. Muon Community (GMM) *LHCC2019: 2-D view of scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-L-CERN-0002 operated in Ar/CO2 70/30 at voltage: Vdrift= 743 V, G1 = 370 V, Vtransfer1 = 290 V, G2 = 363 V, Vtransfer2 = 578 V, G3 = 395 V, Vind= 412 V. The ASIC was installed on the readout sector 15 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The s-curve measurement was taken in normal operation. Muon Community (GMM) *LHCC2019: 2-D view of scurves measured using the VFAT3 calibration module. The red points show the mean value from the error function fit, their error bars show the ENC. The detector used was the GE11-X-L-CERN-0002 operated in Ar/CO2 70/30 at voltage: Vdrift= 743 V, G1 = 370 V, Vtransfer1 = 290 V, G2 = 363 V, Vtransfer2 = 578 V, G3 = 395 V, Vind= 412 V. The ASIC was installed on the readout sector 15 and set at medium gain, in CFD mode, at threshold ARM_DAC_THR = 100. The readout sector 15 was partially irradiated with an alpha source (Am241), from strip 57 to 70 approx. The s-curve measurement has been taken after a discharge occurred in the detector. Empty scurvesindicate that the channel is no longer responding, narrow sigma scurveindicate that the channel is disconnected from the strip (low ENC compatible with zero input capacitance).

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## Public Results 2018

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 Muon Community (GMM) ICHEP2018:Effective gas gain curves as a function of divider current of three GE1/1-S-X-KOREA detectors. The detectors are assembled with Mecaro GEM foils. 0002 and 0003 detectors share parts except GEM foils. To measure gain curves, the standard QC5 methodology established for GE1/1 production is followed. Measured gains are 2.2-5.1*10^4 at 700uA divider current. The results are consistent with the gains of GE/1 detectors based on CERN foils. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: QC5 gain uniformity plot of GE1/1-S-X-KOREA-0001 detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 16.2%. The results is slightly above TDR requirement of 15%. It could be explained by PCB bending or GEM hole non-uniformity. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: QC5 gain uniformity plot of GE1/1-S-X-KOREA-0002 detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 10.2%. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: QC5 gain uniformity plot of GE1/1-S-X-KOREA-0003 detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 12.0%. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: Rate capability plot of GE1/1-S-X-KOREA-0003 detector. Normalized gas gain as a function of x-ray flux (Hz/mm^2) is shown. Initial gain is 32000. To scan x-ray flux, not only current of x-ray tube is varied but also the number of Cu tape as attenuator is varied. Because counting electronics can't work well at rate over 6*10^5 Hz due to signal pileup, extrapolation is used to estimate event rate. By using 2mm diameter collimator, exposed area to x-ray is estimated as 3.14mm^2. No bump on normalized gain is observed. It seems to contradict to common knowledge on collection efficiency and gain depending on rate and space charge. Actually it's due to high protection resistor. As GE1/1 foil equipped with 10Mohm protection resistor, voltage drop due to extra current at high x-ray flux is significant. Thus real voltage applied on GEM foil drops at high flux. That's why increase of gain is not observed. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: Aging test of GE1/1-S-X-KOREA-0001 detector. Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from Cs 137 for 1300 hour continuously. No gain drop due to aging effect is observed up to 34mC/cm^2. It corresponds to 113 years of GE2/1 and 1.2 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.
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 Muon Community (GMM) ICHEP2018:Effective gas gain curves as a function of divider current of three GE1/1-S-X-KOREA detectors. The detectors are assembled with Mecaro GEM foils. 0002 and 0003 detectors share parts except GEM foils. To measure gain curves, the standard QC5 methodology established for GE1/1 production is followed. Measured gains are 2.2-5.1*10^4 at 700uA divider current. The results are consistent with the gains of GE/1 detectors based on CERN foils. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: QC5 gain uniformity plot of GE1/1-S-X-KOREA-0001 detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 16.2%. The results is slightly above TDR requirement of 15%. It could be explained by PCB bending or GEM hole non-uniformity. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: QC5 gain uniformity plot of GE1/1-S-X-KOREA-0002 detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 10.2%. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: QC5 gain uniformity plot of GE1/1-S-X-KOREA-0003 detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. The measured gain variance is 12.0%. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: Rate capability plot of GE1/1-S-X-KOREA-0003 detector. Normalized gas gain as a function of x-ray flux (Hz/mm^2) is shown. Initial gain is 32000. To scan x-ray flux, not only current of x-ray tube is varied but also the number of Cu tape as attenuator is varied. Because counting electronics can't work well at rate over 6*10^5 Hz due to signal pileup, extrapolation is used to estimate event rate. By using 2mm diameter collimator, exposed area to x-ray is estimated as 3.14mm^2. No bump on normalized gain is observed. It seems to contradict to common knowledge on collection efficiency and gain depending on rate and space charge. Actually it's due to high protection resistor. As GE1/1 foil equipped with 10Mohm protection resistor, voltage drop due to extra current at high x-ray flux is significant. Thus real voltage applied on GEM foil drops at high flux. That's why increase of gain is not observed. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers. Muon Community (GMM) ICHEP2018: Aging test of GE1/1-S-X-KOREA-0001 detector. Corrected normalized gain as function of accumulated charge is presented. The vertical axis is corrected normalized gain. Initial gain is 20000. To measure the radiation hardness, the methodology established for R&D of GE1/1 and Phase-2 upgrade is followed. The chamber is installed in GIF++ and exposed to 662 keV x-ray from Cs 137 for 1300 hour continuously. No gain drop due to aging effect is observed up to 34mC/cm^2. It corresponds to 113 years of GE2/1 and 1.2 years of ME0 operation at the HL-LHC. The measurement is a part of quality evaluation of Mecaro foils that will be used for Phase-2 upgrade of GEM chambers.

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 Muon Community (GMM) Effective gas gain of the long GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch
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 Muon Community (GMM) Effective gas gain of the long GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) Effective gas gain of the short GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) Effective gas gain of the long GE1/1 chambers, assembled at CERN, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the short GE1/1 chambers, assembled at CERN, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the short GE1/1 chambers, assembled at the Bari site, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the short GE1/1 chambers, assembled at the FIT site, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the long GE1/1 chambers, assembled in Ghent, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the long GE1/1 pakistan chambers, assembled at CERN, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Efficiency of the B2B GE1/1 gap configuration detector vs. The effective gas gain. The black dashed line represents the nominal gain at which GE1/1 detectors are foreseen to operate, while red and blue dashed lines represent the extendednominal gain regions of +/- 15% and +/-50 % respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Time resolution of the B2B GE1/1 gap configuration detector vs. The effective gas gain. The black dashed line represents the nominal time resolution at which GE1/1 detectors are foreseen to operate, while red and blue dashed lines represent the time resolutions for the detector operating at +/- 15% and +/-50% of the nominal gain. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 gain uniformity plot of GE2/1-M4detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch
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 Muon Community (GMM) Effective gas gain of the long GE1/1 chambers, assembled at CERN, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the short GE1/1 chambers, assembled at CERN, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the short GE1/1 chambers, assembled at the Bari site, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the short GE1/1 chambers, assembled at the FIT site, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the long GE1/1 chambers, assembled in Ghent, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective gas gain of the long GE1/1 pakistan chambers, assembled at CERN, for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane while blue and red traingles represent maximum and minimum gain for a chamber with given s/n respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Efficiency of the B2B GE1/1 gap configuration detector vs. The effective gas gain. The black dashed line represents the nominal gain at which GE1/1 detectors are foreseen to operate, while red and blue dashed lines represent the extendednominal gain regions of +/- 15% and +/-50 % respectively. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Time resolution of the B2B GE1/1 gap configuration detector vs. The effective gas gain. The black dashed line represents the nominal time resolution at which GE1/1 detectors are foreseen to operate, while red and blue dashed lines represent the time resolutions for the detector operating at +/- 15% and +/-50% of the nominal gain. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 gain uniformity plot of GE2/1-M4detector. To measure the uniformity, the standard QC5 methodology established for GE1/1 production is followed. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) Example of the QC3 test output: Typical pressure vs time curve obtained during the GE1/1 quality control. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC3 production summary plot: Gas leak parameters of the GE1/1 chambers. The leak parameter tau is defined by fitting the pressure vs time curve with P(t)=EXP(A-t/tau), where A is a constant. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Example of the QC4 test output: Typical I(V) curve obtained during the GE1/1 quality control. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC4 production summary plot: Deviation between the expected resistance and the resistance measured with the I(V) curve of the GE1/1 detectors. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 production summary plot for Long chambers: Effective gas gain of the long GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 production summary plot for Short chambers: Effective gas gain of the short GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Example of the QC5 gain curve output: Typical effective gain curve obtained during the GE1/1 quality control. I_divider is the current flowing through the HV resistive divider that provide potential to the detector electrodes. P0 and T0 corrections parameter are determined by averaging the temperature and pressure conditions in the P5 cavern. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch
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 Muon Community (GMM) Example of the QC3 test output: Typical pressure vs time curve obtained during the GE1/1 quality control. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC3 production summary plot: Gas leak parameters of the GE1/1 chambers. The leak parameter tau is defined by fitting the pressure vs time curve with P(t)=EXP(A-t/tau), where A is a constant. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Example of the QC4 test output: Typical I(V) curve obtained during the GE1/1 quality control. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC4 production summary plot: Deviation between the expected resistance and the resistance measured with the I(V) curve of the GE1/1 detectors. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 production summary plot for Long chambers: Effective gas gain of the long GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 production summary plot for Short chambers: Effective gas gain of the short GE1/1 chambers for a HV divider current equal to 660uA. The error bars represent the standard deviation of the gain distribution for the entire detector plane. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Example of the QC5 gain curve output: Typical effective gain curve obtained during the GE1/1 quality control. I_divider is the current flowing through the HV resistive divider that provide potential to the detector electrodes. P0 and T0 corrections parameter are determined by averaging the temperature and pressure conditions in the P5 cavern. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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 Muon Community (GMM) QC4 results (I-V curve) with the GE1/1 chamber based on Korean GEM foils. It shows a good linear shape without any discharge. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC4 results (Spurious Signal Rate) with the GE1/1 chamber based on Korean foils. The signal rate < 10 Hz at I = 700 uA. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 results (Effective gain) with the GE1/1 chamber based on Korean GEM foils. Effective gain is around 20000 at I = 700 uA and it is comparable with that of CERN chambers. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Distribution of gain with the GE1/1 chamber based on Mecaro GEM foils in QC5 test (gain uniformity). The gain is measured in ADC counts from each slice (= 4 strips) and shown by shifting the mean value of the distribution to 0. The red curve is a Gaussian fit, showing non-uniformitty of 16%, where 15% or better is required for passing the QC5 test. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch
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 Muon Community (GMM) QC4 results (I-V curve) with the GE1/1 chamber based on Korean GEM foils. It shows a good linear shape without any discharge. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC4 results (Spurious Signal Rate) with the GE1/1 chamber based on Korean foils. The signal rate < 10 Hz at I = 700 uA. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) QC5 results (Effective gain) with the GE1/1 chamber based on Korean GEM foils. Effective gain is around 20000 at I = 700 uA and it is comparable with that of CERN chambers. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Distribution of gain with the GE1/1 chamber based on Mecaro GEM foils in QC5 test (gain uniformity). The gain is measured in ADC counts from each slice (= 4 strips) and shown by shifting the mean value of the distribution to 0. The red curve is a Gaussian fit, showing non-uniformitty of 16%, where 15% or better is required for passing the QC5 test. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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## Public Results 2017

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##### Early LS2 Production Plots Early LS2 Production Plots
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• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
• Slice Test Talk Michele in WGM 335 2017-11-16 indico link Note that this is not an approval talk
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##### Test Beam Results muRWELL R&D Test Beam Results muRWELL R&D
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##### GEM Demonstrator Slice Test Commissioning Performance in LHC Run II GEM Demonstrator Slice Test Commissioning Performance in LHC Run II
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Plots describing the performance of the triple-GEM chambers in the slice test. For most time of 2017, the slice test GEMs were not included in CMS running and the operation went almost independent. Therefore plots related to the HV and LV stability of the system and plots related to the calibration of the electronics did not need to be approved by Run Coordination and hence were only approved by the CMS Muon Community in the GMM. At the end of 2017 the GEMs were included in CMS running and CMS triggers were used to make the plots of the delay between the GEM DAQ S-bit and the CMS L1 Accept. These plots were approved by Run Coordination followed by a CMS wide approval.

###### CMS RC Responsability
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• CMS Detector Performance Note No DP made yet and this could in principle be done --> work for GEM DPG Conveners
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• CMS Detector Performance Note No DP made yet and this could in principle be done --> work for GEM DPG Conveners

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###### CMS Muon Responsability

• No RC approval necessary (GEM chambers at that time not considered as part of running CMS)
• Plots approved in GMM 2017-05-29 indico link slides pdf twiki link
###### Slice Test Standard HV
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 HV stability of GEMINI28L1 in the period 10-20 April 2017 The plot shows the behavior of the voltage and divider current of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied to the chamber, while the red one is the current passing through the high voltage divider used to distribute the the power to the different foils and gaps. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular and for the divider current there are less data: after the 12th of April the value of current didn't change, so there are no data in the interval 12th-20th April. The plots shows an overall stability of the chamber over a 10 days period, with variations of the order of 1 % for the voltage and 0.3 % for the divider current. The errors are estimated from the resolution of the A1526N CAEN module, used to power the detector, and are ± 1 V and ± 0.1 μA for the voltage and current respectively. The dashed lines are used only to guide the eyes. Muon Community (GMM) HV stability of GEMINI28L1 in the period 10-20 April 2017 (no collisions, like the above plot, with text added and different scale of the axis) Voltage and divider current vs time, for one Triple-GEM chamber installed for the GE1/1 station in the period 10th- 20th of April 2017. The chamber is GEMINI28L1, positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). In this period no beam was provided by LHC, so reported data are taken without collisions in CMS. Blue crosses represent the voltage applied to the chamber, while red dots show the current passing through the high voltage divider, used to distribute the power to the different foils and gaps. Both data series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not-regular sampling; moreover, for the divider current there are less data: after the 12th April the value of current didn't change, so there are no data after this day. The red dashed line indicates the constant measured value where the latter did not change. The plot shows overall stability of the chamber over a 7 hours period, with variations of the order of 1% for the voltage and 0.3% for the divider current. Errors are estimated from the resolution of the A1526N CAEN module, used to power the detector, and are ± 1 V and ± 0.1 μA for the voltage and current respectively. Dashed lines are used to guide the eyes. Muon Community (GMM) HV stability of GEMINI28L1 on 12th September 2017 (during collisions) Voltage and divider current vs time, for one Triple-GEM chamber installed for the GE1/1 station, on the 12th September 2017 approximately for 7 hours. The chamber is GEMINI28L1, positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). Blue crosses represent the voltage applied to the chamber, while red dots show the current passing through the high voltage divider, used to distribute the power to the different foils and gaps. Reported data are taken during collisions, in particular during fill 6191. Both data series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not-regular sampling; moreover, for the divider current there are less data: after the first moments the value of current didn't change, so there are no data during most of the considered time interval. The red dashed line indicates the constant measured value where the latter did not change. The plot shows overall stability of the chamber over a 7 hours period, with variations of the order of 0.3% for the voltage and 0.1% for the divider current. Errors are estimated from the resolution of the A1526N CAEN module, used to power the detector, and are ± 1 V and ± 0.1 μA for the voltage and current respectively. Dashed lines are used to guide the eyes. Muon Community (GMM)
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 HV stability of GEMINI28L1 in the period 10-20 April 2017 The plot shows the behavior of the voltage and divider current of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied to the chamber, while the red one is the current passing through the high voltage divider used to distribute the the power to the different foils and gaps. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular and for the divider current there are less data: after the 12th of April the value of current didn't change, so there are no data in the interval 12th-20th April. The plots shows an overall stability of the chamber over a 10 days period, with variations of the order of 1 % for the voltage and 0.3 % for the divider current. The errors are estimated from the resolution of the A1526N CAEN module, used to power the detector, and are ± 1 V and ± 0.1 μA for the voltage and current respectively. The dashed lines are used only to guide the eyes. Muon Community (GMM) HV stability of GEMINI28L1 in the period 10-20 April 2017 (no collisions, like the above plot, with text added and different scale of the axis) Voltage and divider current vs time, for one Triple-GEM chamber installed for the GE1/1 station in the period 10th- 20th of April 2017. The chamber is GEMINI28L1, positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). In this period no beam was provided by LHC, so reported data are taken without collisions in CMS. Blue crosses represent the voltage applied to the chamber, while red dots show the current passing through the high voltage divider, used to distribute the power to the different foils and gaps. Both data series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not-regular sampling; moreover, for the divider current there are less data: after the 12th April the value of current didn't change, so there are no data after this day. The red dashed line indicates the constant measured value where the latter did not change. The plot shows overall stability of the chamber over a 7 hours period, with variations of the order of 1% for the voltage and 0.3% for the divider current. Errors are estimated from the resolution of the A1526N CAEN module, used to power the detector, and are ± 1 V and ± 0.1 μA for the voltage and current respectively. Dashed lines are used to guide the eyes. Muon Community (GMM) HV stability of GEMINI28L1 on 12th September 2017 (during collisions) Voltage and divider current vs time, for one Triple-GEM chamber installed for the GE1/1 station, on the 12th September 2017 approximately for 7 hours. The chamber is GEMINI28L1, positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). Blue crosses represent the voltage applied to the chamber, while red dots show the current passing through the high voltage divider, used to distribute the power to the different foils and gaps. Reported data are taken during collisions, in particular during fill 6191. Both data series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not-regular sampling; moreover, for the divider current there are less data: after the first moments the value of current didn't change, so there are no data during most of the considered time interval. The red dashed line indicates the constant measured value where the latter did not change. The plot shows overall stability of the chamber over a 7 hours period, with variations of the order of 0.3% for the voltage and 0.1% for the divider current. Errors are estimated from the resolution of the A1526N CAEN module, used to power the detector, and are ± 1 V and ± 0.1 μA for the voltage and current respectively. Dashed lines are used to guide the eyes. Muon Community (GMM)

###### Multichannel HV
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 HV stability of GEMINI01L1 in the period 15-20 April 2017 The plot shows the behavior of the voltage of one of the Triple-GEM chamber installed for the GE1/1 station in the period 15th-20th of April 2017. In particular, the chamber is GEMINI01L1, which is positioned in the slot GE-1/1-01 towards the interaction point (Layer 1). This particular chamber is powered with a multichannel power supply, with 7 channels represented by the 7 data series. Each doesn't give an absolute value of the voltage applied to that particular layer, but only the difference in voltage with respect to the previous one. The data of all the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular.The plots shows an overall stability of the chamber over a 5 days period. The dashed lines are used only to guide the eyes. Muon Community (GMM) HV stability of GEMINI01L2 in the period 13-20 April 2017 (no collisions) Voltage vs time, for one Triple-GEM chamber installed for the GE1/1 station in the period 13th- 20th of April 2017. The chamber is GEMINI01L2, positioned in the slot GE-1/1-01 as second triple-GEM layer encountered from the interaction point (Layer 2). In this period no beam was provided by LHC, so reported data are taken without collisions in CMS. This particular chamber is powered with a multichannel power supply, with 7 channels represented by the 7 data series. Absolute values of voltage are not shown, whereas each series represents voltage difference with respect to the previous one. Data of all series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not regular sampling. The plot shows an overall stability of the chamber over a 7 days period. Dashed lines are used to guide the eyes. Muon Community (GMM) HV stability of GEMINI01L2 on 29th August 2017 (during collisions) Voltage vs time, for one Triple-GEM chamber installed for the GE1/1 station, on the 29th August approximately for 12 hours. The chamber is GEMINI01L2, positioned in the slot GE-1/1-01 as second triple-GEM layer encountered from the interaction point (Layer 2). Reported data are taken during collisions, in particular during fill 6143. This particular chamber is powered with a multichannel power supply, with 7 channels represented by the 7 data series. Absolute values of voltage are not shown, whereas each series represents voltage difference with respect to the previous one. Data of all series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not regular sampling. The plot shows an overall stability of the chamber over a 7 days period. Dashed lines are used to guide the eyes. Muon Community (GMM)
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 HV stability of GEMINI01L1 in the period 15-20 April 2017 The plot shows the behavior of the voltage of one of the Triple-GEM chamber installed for the GE1/1 station in the period 15th-20th of April 2017. In particular, the chamber is GEMINI01L1, which is positioned in the slot GE-1/1-01 towards the interaction point (Layer 1). This particular chamber is powered with a multichannel power supply, with 7 channels represented by the 7 data series. Each doesn't give an absolute value of the voltage applied to that particular layer, but only the difference in voltage with respect to the previous one. The data of all the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular.The plots shows an overall stability of the chamber over a 5 days period. The dashed lines are used only to guide the eyes. Muon Community (GMM) HV stability of GEMINI01L2 in the period 13-20 April 2017 (no collisions) Voltage vs time, for one Triple-GEM chamber installed for the GE1/1 station in the period 13th- 20th of April 2017. The chamber is GEMINI01L2, positioned in the slot GE-1/1-01 as second triple-GEM layer encountered from the interaction point (Layer 2). In this period no beam was provided by LHC, so reported data are taken without collisions in CMS. This particular chamber is powered with a multichannel power supply, with 7 channels represented by the 7 data series. Absolute values of voltage are not shown, whereas each series represents voltage difference with respect to the previous one. Data of all series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not regular sampling. The plot shows an overall stability of the chamber over a 7 days period. Dashed lines are used to guide the eyes. Muon Community (GMM) HV stability of GEMINI01L2 on 29th August 2017 (during collisions) Voltage vs time, for one Triple-GEM chamber installed for the GE1/1 station, on the 29th August approximately for 12 hours. The chamber is GEMINI01L2, positioned in the slot GE-1/1-01 as second triple-GEM layer encountered from the interaction point (Layer 2). Reported data are taken during collisions, in particular during fill 6143. This particular chamber is powered with a multichannel power supply, with 7 channels represented by the 7 data series. Absolute values of voltage are not shown, whereas each series represents voltage difference with respect to the previous one. Data of all series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time one value changes. This explains not regular sampling. The plot shows an overall stability of the chamber over a 7 days period. Dashed lines are used to guide the eyes. Muon Community (GMM)

###### Slice Test LV
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 LV stability of GEMINI28L1 in the period 10-21 April 2017 - VFAT/GEB The plot shows the behavior of the voltage and current of the GEB and VFATs of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied, while the red one is the current drawn by the GEB and the VFATs. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular. For the current, two typical ranges can be oserved: the current is around 2 A when the VFATs are in sleep mode, while during the runs, the current reaches about 6.5 A. During the period considered the LV remained always on, with moment of operation alternated to period of standby, except for a short moment on the 14th of April (when the two data series go to zero). During both the periods of operation and standby, the system results to be overall stable. Muon Community (GMM) LV stability of GEMINI28L1 in the period 10-21 April 2017 - OH2V The plot shows the behavior of the voltage and current of one of the channels of the Optohybrid (OH) of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied, while the red one is the current drawn by OH. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular. During the period considered the LV remained always on, with moment of operation alternated to period of standby, except for a short moment on the 14th of April (when the two data series go to zero). During all the operation, the system results to be overall stable. Muon Community (GMM) LV stability of GEMINI28L1 in the period 10-21 April 2017 - OH4V The plot shows the behavior of the voltage and current of the second of the channels of the Optohybrid (OH) of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied, while the red one is the current drawn by OH. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular. During the period considered the LV remained always on, with moment of operation alternated to period of standby, except for a short moment on the 14th of April (when the two data series go to zero). During all the operation, the system results to be overall stable. Muon Community (GMM)
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 LV stability of GEMINI28L1 in the period 10-21 April 2017 - VFAT/GEB The plot shows the behavior of the voltage and current of the GEB and VFATs of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied, while the red one is the current drawn by the GEB and the VFATs. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular. For the current, two typical ranges can be oserved: the current is around 2 A when the VFATs are in sleep mode, while during the runs, the current reaches about 6.5 A. During the period considered the LV remained always on, with moment of operation alternated to period of standby, except for a short moment on the 14th of April (when the two data series go to zero). During both the periods of operation and standby, the system results to be overall stable. Muon Community (GMM) LV stability of GEMINI28L1 in the period 10-21 April 2017 - OH2V The plot shows the behavior of the voltage and current of one of the channels of the Optohybrid (OH) of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied, while the red one is the current drawn by OH. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular. During the period considered the LV remained always on, with moment of operation alternated to period of standby, except for a short moment on the 14th of April (when the two data series go to zero). During all the operation, the system results to be overall stable. Muon Community (GMM) LV stability of GEMINI28L1 in the period 10-21 April 2017 - OH4V The plot shows the behavior of the voltage and current of the second of the channels of the Optohybrid (OH) of one of the Triple-GEM chamber installed for the GE1/1 station in the period 10th-20th of April 2017. In particular, the chamber is GEMINI28L1, which is positioned in the slot GE-1/1-28 towards the interaction point (Layer 1). The blue data series represents the voltage applied, while the red one is the current drawn by OH. The data of both the series are automatically stored in an Oracle database by the GEM Detector Control System (DCS), every time that one value changes. This is the reason why the sampling is not regular. During the period considered the LV remained always on, with moment of operation alternated to period of standby, except for a short moment on the 14th of April (when the two data series go to zero). During all the operation, the system results to be overall stable. Muon Community (GMM)

###### S-curve Calibrations
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 Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 VFAT position 0 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 VFAT position 0 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 VFAT position 14 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. This particular VFAT is a example of one of the noisiest cases in the system. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 VFAT position 0 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 99% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 VFAT position 14 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 99% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 ieta sector 3 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses for an entire ieta sector. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses for an entire ieta sector. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. This particular ieta sector is one of the noisiest in the system. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 3 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses for an entire ieta sector. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 99% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C Muon Community (GMM)
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 Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 VFAT position 0 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 VFAT position 0 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 VFAT position 14 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. This particular VFAT is a example of one of the noisiest cases in the system. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 VFAT position 0 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 99% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 VFAT position 14 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 99% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 ieta sector 3 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses for an entire ieta sector. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==0) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses for an entire ieta sector. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 50% response point to the same VCal value. This particular ieta sector is one of the noisiest in the system. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 3 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C This is the response of the chip to the injection of internal calibration pulses for an entire ieta sector. The size of the pulse is set by the VCal DAC and a configurable number of pulses are injected. The total number of times the comparator fired is recorded. The second image is the response after adjusting the individual channel registers to trim the 99% response point to the same VCal value. Muon Community (GMM) Pre/post-trimming (ztrim==3) s-curve for GEMINI01L2 ieta sector 6 Other formats pre-trim: eps, pdf, C Other formats post-trim: eps, pdf, C Muon Community (GMM)

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• No RC approval necessary (generic R&D, no data from P5)
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• Plots approved in GMM 2017-xx-yy No Slides presented to GMM

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## Public Results 2016

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• CMS DOC DB CMS-doc-13494
• Strictly speaking no RC approval necessary because chambers to be installed are not considered as part of running CMS system
• Plots approved in GMM 2016-10-24 indico link
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Figure
Description

Accepted GEM Foil Leakage Currents Post Detector Assembly (All Foils): The leakage current is the current that flows from the top of a GEM foil to the bottom along the dielectric surface of the walls of the holes, which have been chemically etched into the foil, in the presence of an applied voltage. The plot shows the leakage current for accepted foils used in the assembly of detectors for the GE1/1 Slice Test after detector construction has completed. Voltage is applied using a giga-ohm insulation tester. Applied voltage is either 500 or 550 volts depending on the model number of the giga-ohm insulation tester used. The leakage currents are measured inside a class 1?000 clean room in air with the relative humidity controlled to less than 40%.  Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch

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| Figure | Description |
| <img width="298" src="/twiki/pub/CMSPublic/GEMDPGPublic/GMM-2016-10-24-plot1-temp.png" /> | Accepted GEM Foil Leakage Currents Post Detector Assembly (All Foils): The leakage current is the current that flows from the top of a GEM foil to the bottom along the dielectric surface of the walls of the holes, which have been chemically etched into the foil, in the presence of an applied voltage. The plot shows the leakage current for accepted foils used in the assembly of detectors for the GE1/1 Slice Test after detector construction has completed. Voltage is applied using a giga-ohm insulation tester. Applied voltage is either 500 or 550 volts depending on the model number of the giga-ohm insulation tester used. The leakage currents are measured inside a class 1?000 clean room in air with the relative humidity controlled to less than 40%. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch |
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###### GEM Foil Leakage Current
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 Accepted GEM Foil Leakage Currents Post Detector Assembly. Other formats: short & long: pdf, short only png pdf, long only png pdf The leakage current is the current that flows from the top of a GEM foil to the bottom along the dielectric surface of the walls of the holes, which have been chemically etched into the foil, in the presence of an applied voltage. The plot shows the leakage current for accepted foils used in the assembly of detectors for the GE1/1 Slice Test after detector construction has completed. Voltage is applied using a giga-ohm insulation tester. Applied voltage is either 500 or 550 volts depending on the model number of the giga-ohm insulation tester used. The leakage currents are measured inside a class 1’000 clean room in air with the relative humidity controlled to less than 40%. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM)
<!--  Likely not approved, they are not in the GMM Approval Talk of Brian
GEM Chamber Leake Rate

Accepted GEM Foil Leakage Currents Post Detector Assembly (All Foils).  Other formats: pdf
Muon Community (GMM)

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 Accepted GEM Foil Leakage Currents Post Detector Assembly. Other formats: short & long: pdf, short only png pdf, long only png pdf The leakage current is the current that flows from the top of a GEM foil to the bottom along the dielectric surface of the walls of the holes, which have been chemically etched into the foil, in the presence of an applied voltage. The plot shows the leakage current for accepted foils used in the assembly of detectors for the GE1/1 Slice Test after detector construction has completed. Voltage is applied using a giga-ohm insulation tester. Applied voltage is either 500 or 550 volts depending on the model number of the giga-ohm insulation tester used. The leakage currents are measured inside a class 1’000 clean room in air with the relative humidity controlled to less than 40%. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM)
<!-- Likely not approved, they are not in the GMM Approval Talk of Brian
<h6> !! GEM Chamber Leake Rate </h6>
| Accepted GEM Foil Leakage Currents Post Detector Assembly (All Foils).
Other formats: pdf | . Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch | Muon Community (GMM) | <img width="400" src="/twiki/pub/CMSPublic/GEMDPGPublic/LeakRate_AllDet_1000_1000_11_prelim_left.png" /> |
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###### GEM Chamber Electrical Tests
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 Behaviour of High Voltage Distribution Circuits used to Power GE1/1 Detectors. Other formats: pdf short only png pdf long only png pdf Behavior of the high voltage distribu/on circuit, which uses a resistive divider to ground, used to power GE1/1 Slice Test detectors. Detectors are flushed with CO 2 for 5 hours at 2.5L/hr prior to powering. The effective resistance of the high voltage distribution circuit is 5.0 (5.3) MOhm in the presence of one (two) external low-­‐pass symmetric filters. Curves shown at left are representative of all GE1/1 Slice Test detectors. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Percent Difference Between Measured and Calculated Values for the Effective Resistance of the High Voltage Distribution Circuits used to Power GE1/1 Detectors. Other formats pdf Percent difference between measured, using an ohm-meter, and calculated, derived from the slope of the lines displayed in the previous plots, effective resistance values for the high voltae distribution circuits used to power the GE1/1 detectors. Detectors are flushed with CO2 for 5 hours at 2.5 l/hr prior to powering. The effective resistance of the high voltage distribution circuit is 5.0 (5.3) MOhm in the presence of one (two) low-pass symmetric filters. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Spurious Signal R_ss Rates observed while powering GE1/1 Slice Test Detectors in Non-Amplifying Gas. Other formats: pdf short only: png pdf long only: png pdf long (zoom): png pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Origin of the Spurious Signals due to a Coronal Discharge inside the GE1/1 Detector Gas Volume. Other formats: pdf Spurious signal counts versus strip number recorded with a high granularity charge sensi/ve readout system. Detector is flushed with Ar/CO2 (70/30) at 2.5 L/hr. The current in the resis/ve divider is 537 μA, corresponding to an efficiency below 1%. Counts originate only from spurious signals and not paricle ionization. Three trials were performed: (i) baseline design, (ii) non-­‐ferromagnetic stainless steel stretching pullouts insulated with polyurethane spray, and (iii) stretching pullouts made from nylon. The second and third trials have the metallic lateral stretching screw removed between strip number 250 and 300. These trials demonstrate that coronal discharges from the GEM active area to conductive components do not cause the spurious signal. The origin of the spurious signal is a coronal discharge from the GEM active area along the internal frame to ground through the anode strips readout chain. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM)
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 Behaviour of High Voltage Distribution Circuits used to Power GE1/1 Detectors. Other formats: pdf short only png pdf long only png pdf Behavior of the high voltage distribu/on circuit, which uses a resistive divider to ground, used to power GE1/1 Slice Test detectors. Detectors are flushed with CO 2 for 5 hours at 2.5L/hr prior to powering. The effective resistance of the high voltage distribution circuit is 5.0 (5.3) MOhm in the presence of one (two) external low-­‐pass symmetric filters. Curves shown at left are representative of all GE1/1 Slice Test detectors. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Percent Difference Between Measured and Calculated Values for the Effective Resistance of the High Voltage Distribution Circuits used to Power GE1/1 Detectors. Other formats pdf Percent difference between measured, using an ohm-meter, and calculated, derived from the slope of the lines displayed in the previous plots, effective resistance values for the high voltae distribution circuits used to power the GE1/1 detectors. Detectors are flushed with CO2 for 5 hours at 2.5 l/hr prior to powering. The effective resistance of the high voltage distribution circuit is 5.0 (5.3) MOhm in the presence of one (two) low-pass symmetric filters. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Spurious Signal R_ss Rates observed while powering GE1/1 Slice Test Detectors in Non-Amplifying Gas. Other formats: pdf short only: png pdf long only: png pdf long (zoom): png pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Origin of the Spurious Signals due to a Coronal Discharge inside the GE1/1 Detector Gas Volume. Other formats: pdf Spurious signal counts versus strip number recorded with a high granularity charge sensi/ve readout system. Detector is flushed with Ar/CO2 (70/30) at 2.5 L/hr. The current in the resis/ve divider is 537 μA, corresponding to an efficiency below 1%. Counts originate only from spurious signals and not paricle ionization. Three trials were performed: (i) baseline design, (ii) non-­‐ferromagnetic stainless steel stretching pullouts insulated with polyurethane spray, and (iii) stretching pullouts made from nylon. The second and third trials have the metallic lateral stretching screw removed between strip number 250 and 300. These trials demonstrate that coronal discharges from the GEM active area to conductive components do not cause the spurious signal. The origin of the spurious signal is a coronal discharge from the GEM active area along the internal frame to ground through the anode strips readout chain. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM)

###### GEM Chamber Effective Gas Gain
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 Effective Gas Gain of GE1/1 Slice Test Detectors as a Function of Divider Current. Other formats: pdf short only: png pdf long only: png pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective Gas Gain of GE1/1 Slice Test Detectors as a Function of Divider Voltage. Other formats: pdf short only: png pdf long only: png pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Spectral Analysis Example Along an iη Row of a GE1/1 Slice Test Detector Used in Response Uniformity Determination. Other formats: pdf for papers: png pdf Description to be taken from the presentation Use this version only for posters and talks. Take the alternative version for publication in Papers and Proceedings. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Spectral Analysis Example Along an iη Row of a GE1/1 Slice Test Detector Used in Response Uniformity Determination. Other formats: pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM)
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 Effective Gas Gain of GE1/1 Slice Test Detectors as a Function of Divider Current. Other formats: pdf short only: png pdf long only: png pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Effective Gas Gain of GE1/1 Slice Test Detectors as a Function of Divider Voltage. Other formats: pdf short only: png pdf long only: png pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Spectral Analysis Example Along an iη Row of a GE1/1 Slice Test Detector Used in Response Uniformity Determination. Other formats: pdf for papers: png pdf Description to be taken from the presentation Use this version only for posters and talks. Take the alternative version for publication in Papers and Proceedings. Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM) Spectral Analysis Example Along an iη Row of a GE1/1 Slice Test Detector Used in Response Uniformity Determination. Other formats: pdf Description to be taken from the presentation Contact: cms-dpg-conveners-gem@cernNOSPAMPLEASE.ch Muon Community (GMM)

###### GEM Chamber Response Uniformity
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• No RC approval necessary (generic R&D, no detectors for P5, no data from P5)
• Plots approved in GMM 2016-02-01