Difference: NSWPublicResults (1 vs. 19)

Revision 192015-07-01 - MarcoVanadia

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Fig. 15: Ageing studies on a Micromegas chamber irradiated with x-rays
Mesh current measured in a MM test prototype chamber similar to a "Tmm type" prototype irradiated with x-rays and compared with that measured in a reference, non-irradiated detector. The total irradiation dose is 230 mC/cm2, corresponding to 5 years of operation at the high-luminosity LHC with a safety factor above 7. The measurement has been performed at the CEA-Saclay site. 2013 JINST 8 P04028.
mm_single_plane_spatial_resolution.png

Fig. 16: Ageing studies on a Micromegas chamber irradiated with neutrons
Mesh current measured in a MM test prototype chamber similar to a "Tmm type" prototype irradiated with a 8 108n/s cm2 flux of thermal neutrons at Orphee reactor at CEA-Saclay. The total exposition, which lasted 40 hours, is equivalent to 5 years of operation at the high-luminosity LHC with a safety factor above 10. 2013 JINST 8 P04028.
mm_single_plane_spatial_resolution.png

Fig. 17: Ageing studies on a Micromegas chamber irradiated with gamma-rays
Mesh current measured in a MM test prototype chamber similar to a "Tmm type" prototype during an exposure to gamma-rays produced by a 60Co radioactive source at the COCASE facility at CEA-Saclay. The total exposure time is 480 hours, and the total integrated charge is 1484 mC, corresponding to 5 years of high-luminosity LHC with a safety factor above 3. A zoom of the current evolution and of the humidity measurement is also shown. 2013 JINST 8 P04028
mm_single_plane_spatial_resolution.png
 

sTGC Results and Plots

sTGC Chamber Construction

Public Talks at conferences

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META FILEATTACHMENT attachment="apv.png" attr="" comment="" date="1432227159" name="apv.png" path="apv.png" size="129648" user="ntekas" version="1"
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META FILEATTACHMENT attachment="display3.png" attr="" comment="" date="1432227159" name="display3.png" path="display3.png" size="127339" user="ntekas" version="1"
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META FILEATTACHMENT attachment="xray_ageing.png" attr="" comment="Micromegas ageing studies with x-rays" date="1435769002" name="xray_ageing.png" path="xray_ageing.png" size="82170" user="mvanadia" version="1"
META FILEATTACHMENT attachment="neutron_ageing.png" attr="" comment="Micromegas ageing studies with neutrons" date="1435769522" name="neutron_ageing.png" path="neutron_ageing.png" size="97332" user="mvanadia" version="1"
META FILEATTACHMENT attachment="gamma_ageing.png" attr="" comment="Micromegas ageing studies with gamma-rays" date="1435769806" name="gamma_ageing.png" path="gamma_ageing.png" size="62811" user="mvanadia" version="1"

Revision 182015-06-22 - KonstantinosNtekas

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  The measurements were performed with the MMSW quadruplet operated with an amplification voltage $HVamp = 580 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.
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Revision 172015-05-22 - KonstantinosNtekas

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Fig. 2: Integrated charge for one APV channel for a single event
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Fig. 1: Integrated charge for one APV channel for a single event
 Typical integrated charge from one MicroMegas strip readout with the APV25 hybrid cards (through the Scalable Readout System) operated at 40 MHz with 27 samples. A fit with a Fermi-Dirac function with an additional baseline is performed to determine
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Fig. 2: Efficiency map
2D hit reconstruction in a Tmm chamber during a high statistics run. For this study the chamber was kept perpendicular to the beam axis. The hit position in both X and Y readouts is calculated using the centroid method and only events with a single cluster per readout (perpendicular tracks) are used. The inefficient spots appearing every 2.5 mm, corresponding to the pillar structure supporting the mesh of the chamber, are visible. Four different representations of the same plot are shown.
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Fig. 3: Efficiency map
2D hit reconstruction in a Tmm chamber during a high statistics run. For this study the chamber was kept perpendicular to the beam axis. The hit position in both X and Y readouts is calculated using the centroid method and only events with a single cluster per readout (perpendicular tracks) are used. The inefficient spots appearing every 2.5 mm, corresponding to the pillar structure supporting the mesh of the chamber, are visible. Four different representations of the same plot are shown.
 The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c π+/p beam.

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Fig. 2: Efficiency map
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Fig. 4: Efficiency map
 Hit reconstruction efficiency as a function of the extrapolated reference track hit position for a 2D readout chamber of Tmm type. The reference track is reconstructed from 3 Tmm chambers and is then extrapolated to the fourth Tmm under study. Left column corresponds to X and right column corresponds to Y.

The first row shows the efficiency for an irradiated area 20 mm wide. The efficiency dips 15% appearing every 2.5 mm correspond to the pillar structure supporting the mesh. The second row focuses only on selected areas on the Y readout of the chamber which are around the pillar region (bands 500μm). The effect of the pillars is more severe in these regions reaching local efficiency dips of the order of 40%. By scanning only the region in between the pillars the efficiency is uniform along the readout channels and a high efficiency is measured for both layers (above 98%). The Y readout shows higher efficiency owing to the fact that it is right below the resistive strips and thus it accumulates more charge than the X layer.

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Fig. 2: Efficiency map
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Fig. 5: Efficiency map
  Hit reconstruction efficiency as a function of the extrapolated reference track hit for 2 small T type bulk resistive MM chambers namely TQF, T2. The reference track is reconstructed from 4 Tmm chambers and is then extrapolated to the chamber under study. The two plots on the left correspond to data acquried with the chambers perpendicular to the beam axis while for the two right plots the chambers were inclined by 30 degrees. In both cases the centroid method is used for the reconstruction of the hits. The efficiency dips (5%) appearing every 5 and 2.5 mm respectively correspond to the pillar structure supporting the mesh. The pitch between the pillars and their size are different for the two chambers under study as it is evident from the plots. The TQF chamber has 500 μm wide pillars with a pitch of 5 mm while the T2 pillars are $300μm wide with a pitch of 2.5 mm. In the case of the inclined chambers the particles traverse the chambers under an angle inducing signal in larger number of strips compared to the 0 degrees case. In this case the efficiency is expected to be unaffected by the pillars as it is shown on the two plots corresponding to the 30 degrees case (above 99%).
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Fig. 7: Effect of the pillars on the hit reconstruction
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Fig. 6: Effect of the pillars on the hit reconstruction
 Apart from the efficiency the pillar structure affects also the hit reconstruction intriducing a bias in the hits reconstructed in their region. This effect (bias) is studied using a set of three Tmm chambers to reconstruct a reference track which is then extrapolated to a fourth Tmm chamber. Chambers are kept perpendicular to the beam and the hit in each chamber is reconstructed using the centroid method. In the top plot, the residuals between the hit reconstructed in the chamber under study and the reference tracks are plotted versus the reconstructed hit position. In the bottom plot the reconstructed 2-D hit position in the same chamber is plotted. The position of the pillars is clearly visible in the bottom plot and the observed bias in the reconstructed hit position can be associasated with the position of the pillars comapring the two plots. The bias is evident in each pillar region with a maximum value 150μm.

The measurements were performed with Tmm type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

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Fig. 4: Spatial resolution of precision coordinate of Tmm/Tmb chambers
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Fig. 7: Spatial resolution of precision coordinate of Tmm/Tmb chambers
  Residual distributions from the hit position difference between a Tmm and a Tmb chamber, divided by √2 (assuming similar resolution for both chambers sice the effect of the different pillar pattern is negligible), featuring a 2D readout. The left plot corresponds to the residuals of the X readouts while the right one shows the Y hit residuals. For this measurement the chambers were kept perpendicular to the beam and the hit reconstruction was done using the centroid method selecting single cluster events in both chambers. A similar performance, in terms of spatial resolution, for X and Y readouts is observed.
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Fig. 6: Spatial resolution of the T chambers
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Fig. 8: Spatial resolution of the T chambers
 Residual distributions from the hit position difference between two T type MM chambers (T2,T4) , divided by √2. For this measurement the chambers were kept perpendicular to the beam and the hit reconstruction was done using the centroid method selecting single cluster events in both chambers.

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians

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Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype. Residuals between the first and the second layer of the MMSW, both with strips
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Fig. 9: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype. Residuals between the first and the second layer of the MMSW, both with strips
 measuring the precision coordinate, divided by √2 (assuming similar resolution for both layers).

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians

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Fig. 4: Spatial resolution of precision coordinate of the MMSW
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Fig. 10: Spatial resolution of precision coordinate of the MMSW
 Left: Residuals between the second and the combination of the two stereo readout layers. Right: Residuals between the first and the combination of the two stereo readout layers. The residuals are divided by √1.5 (assuming similar resolution for all 3 layers) because the second hit is reconstructed by combining the two stereo layers (T.Alexopoulos et al., ATL-MUON-INT-2014-005}).\
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Fig. 5: Spatial resolution of second coordinate of the MMSW
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Fig. 11: Spatial resolution of second coordinate of the MMSW
 Left : Residual distributions from the hit position difference between the 2nd coordinate hit, reconstructed using the stereo readout 3 and 4 layers of MMSW, with a 2nd coordinate hit reconstructed in one reference chamber at a distance 20 cm from the first plane of the MMSW. Both chambers wee perpendicular to the beam axis and the hit per layer is reconstructed using the centroid method. Right : MC simulation of the ratio between the resolution of the 2nd hit reconstructed combining two stereo layers with the precision coordinate resolution of each stereo layer as a function of the stereo angle value (T.Alexopoulos et al., ATL-MUON-INT-2014-005). For a stereo angle of 1.5 degrees, as in the MMSW case, we expect this ratio to be 27 which is in good agreement with our measurement.
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Fig. 5: μTPC refinement - Angular Dsitributions
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Fig. 12: μTPC refinement - Angular Dsitributions
  Angular distributions reconstructed with a T type MM chamber with the μTPC method for four different chamber inclination angles with respect to the beam axis (10, 20, 30, 40 degrees). The long tails correspond to badly reconstructed tracks because of wrong timing determination or owing to clusters with small number of strips. The mean reconstructed angle is estimated by fitting a gaussian on the peak of the distribution. The angular resolution (width of the gaussian) improves with increasing the incidence angle of the track owing to the fact that there is a larger number of points (strips) to be used for the reconstruction of the track.
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Fig. 5: μTPC refinement - Angle Reconstruction and Spatial Resolution
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Fig. 13: μTPC refinement - Angle Reconstruction and Spatial Resolution
  Left: Comparison of the mean reconstructed angle for different chamber inclination angles with respect to the beam axis before (blue markers) and after (red markers) the refinement of the μTPC method. When the μTPC method is corrected for the effect of the capacitive coupling between neighboring strips and the charge position assignment in the edges of the cluster a significant reduction in the observed mean reconstructed angle bias is observed. The remaining bias is attributed to the remaining effect of the capacitive coupling between the middle strips of the cluster.
Right: Comparison of the spatial resolution measured for different chamber inclination angles with respect to the beam axis (blue markers) and after (red markers) the refinement of the μTPC method. The refinement of the μTPC method results in a siginficant improvement in the measured spatial resolution (especially for the 10, 20 degrees case). The residual distributions that are used for the extraction of the resolution are fitted with a double gaussian to take into account also the tails. For the resolution plot shown here the resolution is defined as the σ of the core gaussian.
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Fig. 10: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
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Fig. 14: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
 

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Revision 162015-05-21 - KonstantinosNtekas

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 A fit with a Fermi-Dirac function with an additional baseline is performed to determine the strip-hit time, which is defined as the inflection point of the fitted function. Strip-hit charge is measured in the anlayses from the maximum of this distribution or
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from the plateau of the FD function, in both cases subtracting the fitted baseline.
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from the plateau of the FD function, in both cases subtracting the fitted baseline.
 
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 T4 on particles with a 30 degrees inclination during a test beam at H4. (Bottom) charge read by each of the strips. (Top)
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reconstructed centroid and μTPC track.
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reconstructed centroid and μTPC track.

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Fig. 2: Efficiency map
2D hit reconstruction in a Tmm chamber during a high statistics run. For this study the chamber was kept perpendicular to the beam axis. The hit position in both X and Y readouts is calculated using the centroid method and only events with a single cluster per readout (perpendicular tracks) are used. The inefficient spots appearing every 2.5 mm, corresponding to the pillar structure supporting the mesh of the chamber, are visible. Four different representations of the same plot are shown.
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The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c π+/p beam.
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The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c π+/p beam.
 
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  The first row shows the efficiency for an irradiated area 20 mm wide. The efficiency dips 15% appearing every 2.5 mm correspond to the pillar structure supporting the mesh. The second row focuses only on selected areas on the Y readout of the chamber which are around the pillar region (bands 500μm). The effect of the pillars is more severe in these regions reaching local efficiency dips of the order of 40%. By scanning only the region in between the pillars the efficiency is uniform along the readout channels and a high efficiency is measured for both layers (above 98%). The Y readout shows higher efficiency owing to the fact that it is right below the resistive strips and thus it accumulates more charge than the X layer.
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The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c π+/p beam.
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  Hit reconstruction efficiency as a function of the extrapolated reference track hit for 2 small T type bulk resistive MM chambers namely TQF, T2. The reference track is reconstructed from 4 Tmm chambers and is then extrapolated to the chamber under study. The two plots on the left correspond to data acquried with the chambers perpendicular to the beam axis while for the two right plots the chambers were inclined by 30 degrees. In both cases the centroid method is used for the reconstruction of the hits. The efficiency dips (5%) appearing every 5 and 2.5 mm respectively correspond to the pillar structure supporting the mesh. The pitch between the pillars and their size are different for the two chambers under study as it is evident from the plots. The TQF chamber has 500 μm wide pillars with a pitch of 5 mm while the T2 pillars are $300μm wide with a pitch of 2.5 mm. In the case of the inclined chambers the particles traverse the chambers under an angle inducing signal in larger number of strips compared to the 0 degrees case. In this case the efficiency is expected to be unaffected by the pillars as it is shown on the two plots corresponding to the 30 degrees case (above 99%).
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Fig. 7: Effect of the pillars on the hit reconstruction
Apart from the efficiency the pillar structure affects also the hit reconstruction intriducing a bias in the hits reconstructed in their region. This effect (bias) is studied using a set of three Tmm chambers to reconstruct a reference track which is then extrapolated to a fourth Tmm chamber. Chambers are kept perpendicular to the beam and the hit in each chamber is reconstructed using the centroid method. In the top plot, the residuals between the hit reconstructed in the chamber under study and the reference tracks are plotted versus the reconstructed hit position. In the bottom plot the reconstructed 2-D hit position in the same chamber is plotted. The position of the pillars is clearly visible in the bottom plot and the observed bias in the reconstructed hit position can be associasated with the position of the pillars comapring the two plots. The bias is evident in each pillar region with a maximum value 150μm.
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The measurements were performed with Tmm type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

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 σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)
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The measurements were performed with Tmm and Tmb type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.
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The measurements were performed with Tmm and Tmb type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

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 σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 550 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 550 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

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 σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)
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The measurements were performed with the MMSW quadruplet operated with an amplification voltage $HVamp = 580 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

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 σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)
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The measurements were performed with the MMSW quadruplet operated with an amplification voltage $HVamp = 580 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.
 
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 σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)
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  Angular distributions reconstructed with a T type MM chamber with the μTPC method for four different chamber inclination angles with respect to the beam axis (10, 20, 30, 40 degrees). The long tails correspond to badly reconstructed tracks because of wrong timing determination or owing to clusters with small number of strips. The mean reconstructed angle is estimated by fitting a gaussian on the peak of the distribution. The angular resolution (width of the gaussian) improves with increasing the incidence angle of the track owing to the fact that there is a larger number of points (strips) to be used for the reconstruction of the track.
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 510 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 510 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

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 Left: Comparison of the mean reconstructed angle for different chamber inclination angles with respect to the beam axis before (blue markers) and after (red markers) the refinement of the μTPC method. When the μTPC method is corrected for the effect of the capacitive coupling between neighboring strips and the charge position assignment in the edges of the cluster a significant reduction in the observed mean reconstructed angle bias is observed. The remaining bias is attributed to the remaining effect of the capacitive coupling between the middle strips of the cluster.
Right: Comparison of the spatial resolution measured for different chamber inclination angles with respect to the beam axis (blue markers) and after (red markers) the refinement of the μTPC method. The refinement of the μTPC method results in a siginficant improvement in the measured spatial resolution (especially for the 10, 20 degrees case). The residual distributions that are used for the extraction of the resolution are fitted with a double gaussian to take into account also the tails. For the resolution plot shown here the resolution is defined as the σ of the core gaussian.
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 510 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 510 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

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META FILEATTACHMENT attachment="apv.pdf" attr="" comment="Micromegas APV integrated charge single channel example" date="1432135045" name="apv.pdf" path="apv.pdf" size="29192" user="ntekas" version="1"
META FILEATTACHMENT attachment="H6_hd.jpg" attr="" comment="Micromegas TB photo" date="1432136777" name="H6_hd.jpg" path="H6_hd.jpg" size="2581887" user="ntekas" version="1"
META FILEATTACHMENT attachment="phiError.pdf" attr="" comment="MC expectation for second coordinate resolution with stereo strips" date="1432198028" name="phiError.pdf" path="phiError.pdf" size="39868" user="ntekas" version="1"
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Revision 152015-05-21 - KonstantinosNtekas

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META TOPICPARENT name="AtlasResults"
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  • MMSW (MM for the Small Wheel): the first 4-layers prototype, 1 m x 0.5 m, in a configuration similar to that of the MM for the NSW. It has two planes with parallel strips (precision) and two planes with (stereo) strips rotated by (+/-) 1.5 degrees with respect to the precision ones for second coordinate measurement. The strip pitch is 415 μm and it has a "floating mesh" as opposed to the bulk technique. The mesh structure has a wire diameter of 30 μm and a pitch of 80 μm. The resistivity used in the resistive strips is 10 MOhm/cm.

All chambers have a 5 mm drift gap and a 128 μm amplification gap.

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When not explicitly specified the chambers were operated with a gas mixture of Ar+7%CO_2, a drift electrical field of 600 V/cm and an amplification HV in the range 540-580 V corresponding to a gain roughly 10000. The chambers are always readout with APV25 chips connected to the SRS system.
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When not explicitly specified the chambers were operated with a gas mixture of Ar+7%CO2, a drift electrical field of 600 V/cm and an amplification HV in the range 540-580 V corresponding to a gain roughly 10000. The chambers are always readout with APV25 chips connected to the SRS system.
 
H6_hd.jpg
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Fig. 2: Integrated charge for one APV channel for a single event
apv.pdf
apv_function.pdf
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Fig. 2: Integrated charge for one APV channel for a single event
Typical integrated charge from one MicroMegas strip readout with the APV25 hybrid cards (through the Scalable Readout System) operated at 40 MHz with 27 samples. A fit with a Fermi-Dirac function with an additional baseline is performed to determine the strip-hit time, which is defined as the inflection point of the fitted function. Strip-hit charge is measured in the anlayses from the maximum of this distribution or from the plateau of the FD function, in both cases subtracting the fitted baseline.
 
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Fig. 2: Event display (μTPC and Centroid)
display3.pdf
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apv.pdf apv_function.pdf

Fig. 2: Event display (μTPC and Centroid)
Display of an event acquired with chamber T4 on particles with a 30 degrees inclination during a test beam at H4. (Bottom) charge read by each of the strips. (Top) reconstructed centroid and μTPC track.

display3.pdf
 
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Fig. 2: Efficiency map
2D hit reconstruction in a Tmm chamber during a high statistics run. For this study the chamber was kept perpendicular to the beam axis. The hit position in both X and Y readouts is calculated using the centroid method and only events with a single cluster per readout (perpendicular tracks) are used. The inefficient spots appearing every 2.5 mm, corresponding to the pillar structure supporting the mesh of the chamber, are visible. Four different representations of the same plot are shown.
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The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of $HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c $&pi+/p beam.
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The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c π+/p beam.
 

tmm2_pillars_colz_log_newaxes.pdf tmm2_pillars_colz.pdf
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Fig. 2: Efficiency map
Hit reconstruction efficiency as a function of the extrapolated reference track hit position for a 2D readout chamber of Tmm type. The reference track is reconstructed from 3 Tmm chambers and is then extrapolated to the fourth Tmm under study. Left column corresponds to X and right column corresponds to Y.

The first row shows the efficiency for an irradiated area 20 mm wide. The efficiency dips 15% appearing every 2.5 mm correspond to the pillar structure supporting the mesh. The second row focuses only on selected areas on the Y readout of the chamber which are around the pillar region (bands 500μm). The effect of the pillars is more severe in these regions reaching local efficiency dips of the order of 40%. By scanning only the region in between the pillars the efficiency is uniform along the readout channels and a high efficiency is measured for both layers (above 98%). The Y readout shows higher efficiency owing to the fact that it is right below the resistive strips and thus it accumulates more charge than the X layer.

The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c π+/p beam.

efficiency_tmm_pillarregions_centroid_perpendiculartracks.pdf

Fig. 2: Efficiency map

Hit reconstruction efficiency as a function of the extrapolated reference track hit for 2 small T type bulk resistive MM chambers namely TQF, T2. The reference track is reconstructed from 4 Tmm chambers and is then extrapolated to the chamber under study. The two plots on the left correspond to data acquried with the chambers perpendicular to the beam axis while for the two right plots the chambers were inclined by 30 degrees. In both cases the centroid method is used for the reconstruction of the hits. The efficiency dips (5%) appearing every 5 and 2.5 mm respectively correspond to the pillar structure supporting the mesh. The pitch between the pillars and their size are different for the two chambers under study as it is evident from the plots. The TQF chamber has 500 μm wide pillars with a pitch of 5 mm while the T2 pillars are $300μm wide with a pitch of 2.5 mm. In the case of the inclined chambers the particles traverse the chambers under an angle inducing signal in larger number of strips compared to the 0 degrees case. In this case the efficiency is expected to be unaffected by the pillars as it is shown on the two plots corresponding to the 30 degrees case (above 99%).

The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during PS/T10 with a 6 GeV/c π+/p$ beam.

efficiency_tqf_t2_centroid_perpendiculartracks_angletext.pdf
efficiency_tqf_t2_centroid_30degtracks_angletext.pdf

Fig. 7: Effect of the pillars on the hit reconstruction
Apart from the efficiency the pillar structure affects also the hit reconstruction intriducing a bias in the hits reconstructed in their region. This effect (bias) is studied using a set of three Tmm chambers to reconstruct a reference track which is then extrapolated to a fourth Tmm chamber. Chambers are kept perpendicular to the beam and the hit in each chamber is reconstructed using the centroid method. In the top plot, the residuals between the hit reconstructed in the chamber under study and the reference tracks are plotted versus the reconstructed hit position. In the bottom plot the reconstructed 2-D hit position in the same chamber is plotted. The position of the pillars is clearly visible in the bottom plot and the observed bias in the reconstructed hit position can be associasated with the position of the pillars comapring the two plots. The bias is evident in each pillar region with a maximum value 150μm.

The measurements were performed with Tmm type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

tmm_pillarseffect_centroid_perpendiculartracks_aligned.pdf

Fig. 4: Spatial resolution of precision coordinate of Tmm/Tmb chambers

Residual distributions from the hit position difference between a Tmm and a Tmb chamber, divided by √2 (assuming similar resolution for both chambers sice the effect of the different pillar pattern is negligible), featuring a 2D readout. The left plot corresponds to the residuals of the X readouts while the right one shows the Y hit residuals. For this measurement the chambers were kept perpendicular to the beam and the hit reconstruction was done using the centroid method selecting single cluster events in both chambers. A similar performance, in terms of spatial resolution, for X and Y readouts is observed.

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)

The measurements were performed with Tmm and Tmb type MM bulk resistive chambers operated with an amplification voltage HVamp = 540 V. The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

spatial_resolution_tmm_tmb_x.pdf spatial_resolution_tmm_tmb_x.pdf

Fig. 6: Spatial resolution of the T chambers
Residual distributions from the hit position difference between two T type MM chambers (T2,T4) , divided by √2. For this measurement the chambers were kept perpendicular to the beam and the hit reconstruction was done using the centroid method selecting single cluster events in both chambers.

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)

The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 550 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

residuals_t2_t4_H4.pdf

Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype. Residuals between the first and the second layer of the MMSW, both with strips measuring the precision coordinate, divided by √2 (assuming similar resolution for both layers).

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)

The measurements were performed with the MMSW quadruplet operated with an amplification voltage $HVamp = 580 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

spatial_resolution_mmsw1_layer1layer2.pdf

Fig. 4: Spatial resolution of precision coordinate of the MMSW
Left: Residuals between the second and the combination of the two stereo readout layers. Right: Residuals between the first and the combination of the two stereo readout layers. The residuals are divided by √1.5 (assuming similar resolution for all 3 layers) because the second hit is reconstructed by combining the two stereo layers (T.Alexopoulos et al., ATL-MUON-INT-2014-005}).\The observed degradation of the measured spatial resolution is mainly owing to the multiple scattering in the material between the layers under study and thus is proportional to the distance separating them (L1,2<L2,34<L1,34). The worse resolution measured compared to the Tmm case is mainly attributed to the different strip pitch.

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)

The measurements were performed with the MMSW quadruplet operated with an amplification voltage $HVamp = 580 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

spatial_resolution_mmsw1_layer2layer34.pdf spatial_resolution_mmsw1_layer1layer34.pdf

Fig. 5: Spatial resolution of second coordinate of the MMSW
Left : Residual distributions from the hit position difference between the 2nd coordinate hit, reconstructed using the stereo readout 3 and 4 layers of MMSW, with a 2nd coordinate hit reconstructed in one reference chamber at a distance 20 cm from the first plane of the MMSW. Both chambers wee perpendicular to the beam axis and the hit per layer is reconstructed using the centroid method. Right : MC simulation of the ratio between the resolution of the 2nd hit reconstructed combining two stereo layers with the precision coordinate resolution of each stereo layer as a function of the stereo angle value (T.Alexopoulos et al., ATL-MUON-INT-2014-005). For a stereo angle of 1.5 degrees, as in the MMSW case, we expect this ratio to be 27 which is in good agreement with our measurement.

σcore corresponds to the width of the core gaussian while σweight is the weighted average of the two gaussians
σweight2=fcoreσcore2+ftailsσtails2, fcore,tails=pcore,tailsσcore,tails/(pcoreσcore+ptailsσtails)

The measurements were performed with the MMSW quadruplet operated with an amplification voltage $HVamp = 580 V. The data were acquired during PS/T9 with a 6 GeV/c π+/p$ beam.

spatial_resolution_mmsw1_layer34ytmm6y.pdf phiError.pdf

Fig. 5: μTPC refinement - Angular Dsitributions

Angular distributions reconstructed with a T type MM chamber with the μTPC method for four different chamber inclination angles with respect to the beam axis (10, 20, 30, 40 degrees). The long tails correspond to badly reconstructed tracks because of wrong timing determination or owing to clusters with small number of strips. The mean reconstructed angle is estimated by fitting a gaussian on the peak of the distribution. The angular resolution (width of the gaussian) improves with increasing the incidence angle of the track owing to the fact that there is a larger number of points (strips) to be used for the reconstruction of the track.

The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 510 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.

angle_10deg_aftercor.pdf
angle_30deg_aftercor.pdf
angle_20deg_aftercor.pdf
angle_40deg_aftercor.pdf
 
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Fig. 5: μTPC refinement - Angle Reconstruction and Spatial Resolution
 
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Fig. 3: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
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Left: Comparison of the mean reconstructed angle for different chamber inclination angles with respect to the beam axis before (blue markers) and after (red markers) the refinement of the μTPC method. When the μTPC method is corrected for the effect of the capacitive coupling between neighboring strips and the charge position assignment in the edges of the cluster a significant reduction in the observed mean reconstructed angle bias is observed. The remaining bias is attributed to the remaining effect of the capacitive coupling between the middle strips of the cluster.
Right: Comparison of the spatial resolution measured for different chamber inclination angles with respect to the beam axis (blue markers) and after (red markers) the refinement of the μTPC method. The refinement of the μTPC method results in a siginficant improvement in the measured spatial resolution (especially for the 10, 20 degrees case). The residual distributions that are used for the extraction of the resolution are fitted with a double gaussian to take into account also the tails. For the resolution plot shown here the resolution is defined as the σ of the core gaussian.
 
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Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer1layer2.pdf
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The measurements were performed with T type MM bulk resistive chambers operated with an amplification voltage HVamp = 510 V.The data were acquired during SPS/H4 testbeam with a 150 GeV/c μ/π+ beam.
 
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Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer2layer34.pdf
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Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer1layer34.pdf
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reco_angle_beforeaftercor_errors.pdf spatial_resolution_utpc_beforeaftercor_atlasnsw.pdf

 
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Fig. 5: Spatial resolution of second coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer34ytmm6y.pdf
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Fig. 10: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
 
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META FILEATTACHMENT attachment="apv_function.pdf" attr="" comment="Micromegas APV integrated charge single channel example" date="1432135045" name="apv_function.pdf" path="apv_function.pdf" size="34031" user="ntekas" version="1"
META FILEATTACHMENT attachment="apv.pdf" attr="" comment="Micromegas APV integrated charge single channel example" date="1432135045" name="apv.pdf" path="apv.pdf" size="29192" user="ntekas" version="1"
META FILEATTACHMENT attachment="H6_hd.jpg" attr="" comment="Micromegas TB photo" date="1432136777" name="H6_hd.jpg" path="H6_hd.jpg" size="2581887" user="ntekas" version="1"
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META FILEATTACHMENT attachment="phiError.pdf" attr="" comment="MC expectation for second coordinate resolution with stereo strips" date="1432198028" name="phiError.pdf" path="phiError.pdf" size="39868" user="ntekas" version="1"

Revision 142015-05-20 - KonstantinosNtekas

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META TOPICPARENT name="AtlasResults"
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Public Talks at conferences

Public Plots

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Fig. 1: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
Fig. 2: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_precision_coordinate.png
Fig. 2: Spatial resolution of second coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_second_coordinate.png
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In the following, performance studies of Micromegas detectors performed with test-beams on several small (10x10 cm2) / medium(1x0.5 m2) size resistive chambers will be reported.
In particular the chambers that will be referred to are:
  • Tmm type bulk resistive MM(Tmm2,..., 6) with 10 cm x10 cm active area, with strips 150 μm wide and with a pitch of 250 μm. The resistive strips follow the readout strips geometry with resistivity 40 MOhm/cm. The woven stainless steel mesh structure has a wire diameter of 18 μm and is segmented in 400 lines/inch corresponding to a mesh pitch of &approx 63.5 μm. The support pillars have a diameter of 300 μm with a pitch of 2.5 mm.
  • Tmb similar to Tmm type. The support pillars have a diameter of 500 μm with a pitch of 5 mm.
  • T type bulk resistive MM (T1,..., T8) with 10 cm x 10 cm active area, readout strips 300 μm wide with 400 μm pitch. The resistive strips follow the readout strips geometry with resistivity 20 MOhm/cm. The woven stainless steel mesh structure has a wire diameter of 18 μm and is segmented in 400 lines/inch corresponding to a mesh pitch of 63.5μm. The drift electrode had also a mesh structure with a density of 325 lines/inch (wires of 30 μm diameter with a pitch of 80 μm).
  • TQF chamber similar to T type but with four areas of different resistive strip pattern with respect to the readout strips (normal, half pitch offset, -1 degree and +2 degrees rotation). The resistivity is a bit lower than the T 10 MOhm/cm
  • MMSW (MM for the Small Wheel): the first 4-layers prototype, 1 m x 0.5 m, in a configuration similar to that of the MM for the NSW. It has two planes with parallel strips (precision) and two planes with (stereo) strips rotated by (+/-) 1.5 degrees with respect to the precision ones for second coordinate measurement. The strip pitch is 415 μm and it has a "floating mesh" as opposed to the bulk technique. The mesh structure has a wire diameter of 30 μm and a pitch of 80 μm. The resistivity used in the resistive strips is 10 MOhm/cm.

All chambers have a 5 mm drift gap and a 128 μm amplification gap. When not explicitly specified the chambers were operated with a gas mixture of Ar+7%CO_2, a drift electrical field of 600 V/cm and an amplification HV in the range 540-580 V corresponding to a gain roughly 10000. The chambers are always readout with APV25 chips connected to the SRS system.

H6_hd.jpg

Fig. 2: Integrated charge for one APV channel for a single event
apv.pdf
apv_function.pdf
Fig. 2: Event display (μTPC and Centroid)
display3.pdf

Fig. 2: Efficiency map
2D hit reconstruction in a Tmm chamber during a high statistics run. For this study the chamber was kept perpendicular to the beam axis. The hit position in both X and Y readouts is calculated using the centroid method and only events with a single cluster per readout (perpendicular tracks) are used. The inefficient spots appearing every 2.5 mm, corresponding to the pillar structure supporting the mesh of the chamber, are visible. Four different representations of the same plot are shown.
The measurements were performed with a Tmm type MM bulk resistive chamber operated with an amplification voltage of $HVamp = 540 V. The data were acquired during PS/T9 with a 10 GeV/c $&pi+/p beam.

tmm2_pillars_colz_log_newaxes.pdf tmm2_pillars_colz.pdf

Fig. 3: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer1layer2.pdf
Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer2layer34.pdf
Fig. 4: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer1layer34.pdf
Fig. 5: Spatial resolution of second coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
spatial_resolution_mmsw1_layer34ytmm6y.pdf
 

sTGC Results and Plots

sTGC Chamber Construction

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META FILEATTACHMENT attachment="sTGC_standalone_residuals_exc.png" attr="" comment="sTGC standalone exclusive resolution" date="1416356815" name="sTGC_standalone_residuals_exc.png" path="sTGC_standalone_residuals_exc.png" size="134802" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_residual_pixel.png" attr="" comment="sTGC residual with respect to a pixel track" date="1416423425" name="sTGC_residual_pixel.png" path="sTGC_residual_pixel.png" size="46562" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_serializer_performance.png" attr="" comment="sTGC serializer performance" date="1417459838" name="sTGC_serializer_performance.png" path="sTGC_serializer_performance.png" size="277911" user="ostelzer" version="1"
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META FILEATTACHMENT attachment="angle_10deg_aftercor.pdf" attr="" comment="Micromegas angular distribution for 10 degrees" date="1432133573" name="angle_10deg_aftercor.pdf" path="angle_10deg_aftercor.pdf" size="16025" user="ntekas" version="1"
META FILEATTACHMENT attachment="angle_20deg_aftercor.pdf" attr="" comment="Micromegas angular distribution for 20 degrees" date="1432133573" name="angle_20deg_aftercor.pdf" path="angle_20deg_aftercor.pdf" size="16177" user="ntekas" version="1"
META FILEATTACHMENT attachment="angle_30deg_aftercor.pdf" attr="" comment="Micromegas angular distribution for 30 degrees" date="1432133573" name="angle_30deg_aftercor.pdf" path="angle_30deg_aftercor.pdf" size="16365" user="ntekas" version="1"
META FILEATTACHMENT attachment="angle_40deg_aftercor.pdf" attr="" comment="Micromegas angular distribution for 40 degrees" date="1432133573" name="angle_40deg_aftercor.pdf" path="angle_40deg_aftercor.pdf" size="16246" user="ntekas" version="1"
META FILEATTACHMENT attachment="efficiency_tmm_pillarregions_centroid_perpendiculartracks.pdf" attr="" comment="Micromegas efficiency map for different regions with respect to the pillars" date="1432133573" name="efficiency_tmm_pillarregions_centroid_perpendiculartracks.pdf" path="efficiency_tmm_pillarregions_centroid_perpendiculartracks.pdf" size="32060" user="ntekas" version="1"
META FILEATTACHMENT attachment="efficiency_tqf_t2_centroid_30degtracks_angletext.pdf" attr="" comment="Micromegas efficiency map for 30 degrees inclination angle" date="1432133573" name="efficiency_tqf_t2_centroid_30degtracks_angletext.pdf" path="efficiency_tqf_t2_centroid_30degtracks_angletext.pdf" size="19074" user="ntekas" version="1"
META FILEATTACHMENT attachment="efficiency_tqf_t2_centroid_perpendiculartracks_angletext.pdf" attr="" comment="Micromegas efficiency map for 0 degrees inclination angle" date="1432133573" name="efficiency_tqf_t2_centroid_perpendiculartracks_angletext.pdf" path="efficiency_tqf_t2_centroid_perpendiculartracks_angletext.pdf" size="19976" user="ntekas" version="1"
META FILEATTACHMENT attachment="reco_angle_beforeaftercor_errors.pdf" attr="" comment="Micromegas reconstructed angle before and after the utpc refinement" date="1432133573" name="reco_angle_beforeaftercor_errors.pdf" path="reco_angle_beforeaftercor_errors.pdf" size="16115" user="ntekas" version="1"
META FILEATTACHMENT attachment="residuals_t2_t4_H4.pdf" attr="" comment="Micromegas resolution for T chamber type" date="1432133573" name="residuals_t2_t4_H4.pdf" path="residuals_t2_t4_H4.pdf" size="18535" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_mmsw1_layer1layer2.pdf" attr="" comment="MMSW precision coordinate resolution (layer1-layer2)" date="1432133573" name="spatial_resolution_mmsw1_layer1layer2.pdf" path="spatial_resolution_mmsw1_layer1layer2.pdf" size="18779" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_mmsw1_layer1layer34.pdf" attr="" comment="MMSW precision coordinate resolution using the stereo strips(layer1-layer34)" date="1432133682" name="spatial_resolution_mmsw1_layer1layer34.pdf" path="spatial_resolution_mmsw1_layer1layer34.pdf" size="18717" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_mmsw1_layer2layer34.pdf" attr="" comment="MMSW precision coordinate resolution using the stereo strips (layer2-layer34)" date="1432133682" name="spatial_resolution_mmsw1_layer2layer34.pdf" path="spatial_resolution_mmsw1_layer2layer34.pdf" size="19138" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_mmsw1_layer34ytmm6y.pdf" attr="" comment="MMSW second coordinate resolution using the stereo strips" date="1432133682" name="spatial_resolution_mmsw1_layer34ytmm6y.pdf" path="spatial_resolution_mmsw1_layer34ytmm6y.pdf" size="19228" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_tmm_tmb_x.pdf" attr="" comment="Micromegas resolution for Tmm chamber type (X readout)" date="1432133682" name="spatial_resolution_tmm_tmb_x.pdf" path="spatial_resolution_tmm_tmb_x.pdf" size="18474" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_tmm_tmb_y.pdf" attr="" comment="Micromegas resolution for Tmm chamber type (Y readout)" date="1432133682" name="spatial_resolution_tmm_tmb_y.pdf" path="spatial_resolution_tmm_tmb_y.pdf" size="17932" user="ntekas" version="1"
META FILEATTACHMENT attachment="spatial_resolution_utpc_beforeaftercor_atlasnsw.pdf" attr="" comment="Micromegas resolution for T chamber type with utpc before and after the refinement of the method" date="1432133682" name="spatial_resolution_utpc_beforeaftercor_atlasnsw.pdf" path="spatial_resolution_utpc_beforeaftercor_atlasnsw.pdf" size="14869" user="ntekas" version="1"
META FILEATTACHMENT attachment="tmm_pillarseffect_centroid_perpendiculartracks_aligned.pdf" attr="" comment="Micromegas effect of the pillars (bias) on the hit reconstruction" date="1432133682" name="tmm_pillarseffect_centroid_perpendiculartracks_aligned.pdf" path="tmm_pillarseffect_centroid_perpendiculartracks_aligned.pdf" size="484472" user="ntekas" version="1"
META FILEATTACHMENT attachment="tmm2_pillars_colz_log_newaxes.pdf" attr="" comment="Micromegas efficiency map from 2d hit reconstruction (col3)" date="1432133682" name="tmm2_pillars_colz_log_newaxes.pdf" path="tmm2_pillars_colz_log_newaxes.pdf" size="1303515" user="ntekas" version="1"
META FILEATTACHMENT attachment="tmm2_pillars_colz.pdf" attr="" comment="Micromegas efficiency map from 2d hit reconstruction (col1)" date="1432133682" name="tmm2_pillars_colz.pdf" path="tmm2_pillars_colz.pdf" size="267914" user="ntekas" version="1"
META FILEATTACHMENT attachment="tmm2_pillars_colz3.pdf" attr="" comment="Micromegas efficiency map from 2d hit reconstruction (col2)" date="1432133682" name="tmm2_pillars_colz3.pdf" path="tmm2_pillars_colz3.pdf" size="835671" user="ntekas" version="1"
META FILEATTACHMENT attachment="tmm2_pillars_scatter.pdf" attr="" comment="Micromegas efficiency map from 2d hit reconstruction (scatterplot)" date="1432133752" name="tmm2_pillars_scatter.pdf" path="tmm2_pillars_scatter.pdf" size="863353" user="ntekas" version="1"
META FILEATTACHMENT attachment="display3.pdf" attr="" comment="Micromegas track evt display" date="1432134816" name="display3.pdf" path="display3.pdf" size="16738" user="ntekas" version="1"
META FILEATTACHMENT attachment="apv_function.pdf" attr="" comment="Micromegas APV integrated charge single channel example" date="1432135045" name="apv_function.pdf" path="apv_function.pdf" size="34031" user="ntekas" version="1"
META FILEATTACHMENT attachment="apv.pdf" attr="" comment="Micromegas APV integrated charge single channel example" date="1432135045" name="apv.pdf" path="apv.pdf" size="29192" user="ntekas" version="1"
META FILEATTACHMENT attachment="H6_hd.jpg" attr="" comment="Micromegas TB photo" date="1432136777" name="H6_hd.jpg" path="H6_hd.jpg" size="2581887" user="ntekas" version="1"

Revision 132014-12-08 - MarcoSessa

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  Here is a list of Muon System talks given at conferences.
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Here is a list of NSW, sTGC and MM talks given at conferences.
 

MicroMegas Results and Plots

MM Chamber Construction

Public Talks at conferences

Revision 122014-12-04 - MarcoSessa

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MM Chamber Construction

Public Talks at conferences

Public Plots

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Fig. 1: Here goes the plot title/short content description and the upload date
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MyPlotName.png
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MyPlotName.png
 

MM Performance

Public Talks at conferences

Public Plots

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Fig. 1: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
Fig. 2: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_precision_coordinate.png
Fig. 2: Spatial resolution of second coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_second_coordinate.png
 
Added:
>
>
Fig. 1: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
Fig. 2: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_precision_coordinate.png
Fig. 2: Spatial resolution of second coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_second_coordinate.png
 

sTGC Results and Plots

sTGC Chamber Construction

Public Talks at conferences

Public Plots

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Fig. 1: Here goes the plot title/short content description and the upload date
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MyPlotName.png
 
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Fig. 1: Here goes the plot title/short content description and the upload date
And here goes the detailed and background information
MyPlotName.png
 

sTGC Performance

Public Talks at conferences

Public Plots

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Fig. 2: Inclusive sTGC residual
The reference track is built from all four hits in the sTGC quadruplet.
sTGC_standalone_residuals_inc.png
Fig. 2: Exclusive sTGC residual
The reference track is built from three hits in the sTGC quadruplet, excluding the first hit for which the residual is computed.
sTGC_standalone_residuals_exc.png
Fig. 2: sTGC residual
The reference track is built from hits in three pixel layers before and after the sTGC quadruplet.
sTGC_residual_pixel.png
 
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Fig. 2: Inclusive sTGC residual
The reference track is built from all four hits in the sTGC quadruplet.
sTGC_standalone_residuals_inc.png
Fig. 2: Exclusive sTGC residual
The reference track is built from three hits in the sTGC quadruplet, excluding the first hit for which the residual is computed.
sTGC_standalone_residuals_exc.png
Fig. 2: sTGC residual
The reference track is built from hits in three pixel layers before and after the sTGC quadruplet.
sTGC_residual_pixel.png
 

Combined Results and Plots

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Fig. 1: Here goes the plot title/short content description and the upload date
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MyPlotName.png
 
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And here goes the detailed and background information
MyPlotName.png
 

Electronics

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Fig. 1: Performance of sTGC serializer: "Eye" diagram
The sTGC trigger data serializer (TDS) ASIC chip is responsible for the preparation of trigger data for both pads and strips with additional task of serializing data for transmission to the circuits on the rim of the NSW detector. The serializer is realized in IBM 130 nm CMOS technology. It is adapted from the CERN GBT serializer, with changed architecture from loading 120 bits at 40 MHz to loading 30 bits in parallel at 160 MHz. The serial output is at 4.8 Gbps. The eye diagram is evaluated in a 12.5 GHz bandwidth, 50 GS/s oscilloscope with a PRBS-31 pattern. The height of the eye is measured to be about 540 mV, and the width is about 180.3 ps. Jitter analysis shows that the total jitter at a bit-error-ratio (BER) of 1E-12 is 49.7 ps. A BER test with embedded PRBS checker inside a Xilinx 7 FPGA was also performed. An error free running of three days has been achieved, which corresponds to a BER less than 1 E-15.
sTGC_serializer_performance.png
>
>
Fig. 1: Performance of sTGC serializer: "Eye" diagram
The sTGC trigger data serializer (TDS) ASIC chip is responsible for the preparation of trigger data for both pads and strips with additional task of serializing data for transmission to the circuits on the rim of the NSW detector. The serializer is realized in IBM 130 nm CMOS technology. It is adapted from the CERN GBT serializer, with changed architecture from loading 120 bits at 40 MHz to loading 30 bits in parallel at 160 MHz. The serial output is at 4.8 Gbps. The eye diagram is evaluated in a 12.5 GHz bandwidth, 50 GS/s oscilloscope with a PRBS-31 pattern. The height of the eye is measured to be about 540 mV, and the width is about 180.3 ps. Jitter analysis shows that the total jitter at a bit-error-ratio (BER) of 1E-12 is 49.7 ps. A BER test with embedded PRBS checker inside a Xilinx 7 FPGA was also performed. An error free running of three days has been achieved, which corresponds to a BER less than 1 E-15.
sTGC_serializer_performance.png
 

Revision 112014-12-01 - OliverStelzerChilton

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META TOPICPARENT name="AtlasResults"
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Electronics

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Fig. 1: Performance of sTGC serializer: "Eye" diagram
The sTGC trigger data serializer (TDS) ASIC chip is responsible for the preparation of trigger data for both pads and strips with additional task of serializing data for transmission to the circuits on the rim of the NSW detector. The serializer is realized in IBM 130 nm CMOS technology. It is adapted from the CERN GBT serializer, with changed architecture from loading 120 bits at 40 MHz to loading 30 bits in parallel at 160 MHz. The serial output is at 4.8 Gbps. The eye diagram is evaluated in a 12.5 GHz bandwidth, 50 GS/s oscilloscope with a PRBS-31 pattern. The height of the eye is measured to be about 540 mV, and the width is about 180.3 ps. Jitter analysis shows that the total jitter at a bit-error-ratio (BER) of 1E-12 is 49.7 ps, which includes about 3.26 ps random jitter and about 9.78 ps deterministic jitter. A BER test with embedded PRBS checker inside a Xilinx 7 FPGA was also performed. An error free running of three days has been achieved, which corresponds to a BER less than 1 E-15.
sTGC_serializer_performance.png
>
>
Fig. 1: Performance of sTGC serializer: "Eye" diagram
The sTGC trigger data serializer (TDS) ASIC chip is responsible for the preparation of trigger data for both pads and strips with additional task of serializing data for transmission to the circuits on the rim of the NSW detector. The serializer is realized in IBM 130 nm CMOS technology. It is adapted from the CERN GBT serializer, with changed architecture from loading 120 bits at 40 MHz to loading 30 bits in parallel at 160 MHz. The serial output is at 4.8 Gbps. The eye diagram is evaluated in a 12.5 GHz bandwidth, 50 GS/s oscilloscope with a PRBS-31 pattern. The height of the eye is measured to be about 540 mV, and the width is about 180.3 ps. Jitter analysis shows that the total jitter at a bit-error-ratio (BER) of 1E-12 is 49.7 ps. A BER test with embedded PRBS checker inside a Xilinx 7 FPGA was also performed. An error free running of three days has been achieved, which corresponds to a BER less than 1 E-15.
sTGC_serializer_performance.png
 


Revision 102014-12-01 - OliverStelzerChilton

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Electronics

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Fig. 1: Here goes the plot title/short content description and the upload date
And here goes the detailed and background information
MyPlotName.png
>
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Fig. 1: Performance of sTGC serializer: "Eye" diagram
The sTGC trigger data serializer (TDS) ASIC chip is responsible for the preparation of trigger data for both pads and strips with additional task of serializing data for transmission to the circuits on the rim of the NSW detector. The serializer is realized in IBM 130 nm CMOS technology. It is adapted from the CERN GBT serializer, with changed architecture from loading 120 bits at 40 MHz to loading 30 bits in parallel at 160 MHz. The serial output is at 4.8 Gbps. The eye diagram is evaluated in a 12.5 GHz bandwidth, 50 GS/s oscilloscope with a PRBS-31 pattern. The height of the eye is measured to be about 540 mV, and the width is about 180.3 ps. Jitter analysis shows that the total jitter at a bit-error-ratio (BER) of 1E-12 is 49.7 ps, which includes about 3.26 ps random jitter and about 9.78 ps deterministic jitter. A BER test with embedded PRBS checker inside a Xilinx 7 FPGA was also performed. An error free running of three days has been achieved, which corresponds to a BER less than 1 E-15.
sTGC_serializer_performance.png
 


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META FILEATTACHMENT attachment="sTGC_standalone_residuals_inc.png" attr="" comment="sTGC standalone inclusive resolution" date="1416356769" name="sTGC_standalone_residuals_inc.png" path="sTGC_standalone_residuals_inc.png" size="119560" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_standalone_residuals_exc.png" attr="" comment="sTGC standalone exclusive resolution" date="1416356815" name="sTGC_standalone_residuals_exc.png" path="sTGC_standalone_residuals_exc.png" size="134802" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_residual_pixel.png" attr="" comment="sTGC residual with respect to a pixel track" date="1416423425" name="sTGC_residual_pixel.png" path="sTGC_residual_pixel.png" size="46562" user="ostelzer" version="1"
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META FILEATTACHMENT attachment="sTGC_serializer_performance.png" attr="" comment="sTGC serializer performance" date="1417459838" name="sTGC_serializer_performance.png" path="sTGC_serializer_performance.png" size="277911" user="ostelzer" version="1"

Revision 92014-11-19 - OliverStelzerChilton

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Fig. 2: Inclusive sTGC residual
The reference track is built from all four hits in the sTGC quadruplet.
sTGC_standalone_residuals_inc.png
Fig. 2: Exclusive sTGC residual
The reference track is built from three hits in the sTGC quadruplet, excluding the first hit for which the residual is computed.
sTGC_standalone_residuals_exc.png
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Fig. 2: sTGC residual
The reference track is built from hits in three pixel layers before and after the sTGC quadruplet.
sTGC_residual_pixel.png
 
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META FILEATTACHMENT attachment="mmsw_second_coordinate.png" attr="" comment="MMSW second coordinate resolution" date="1416271190" name="mmsw_second_coordinate.png" path="mmsw_second_coordinate.png" size="42073" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_standalone_residuals_inc.png" attr="" comment="sTGC standalone inclusive resolution" date="1416356769" name="sTGC_standalone_residuals_inc.png" path="sTGC_standalone_residuals_inc.png" size="119560" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_standalone_residuals_exc.png" attr="" comment="sTGC standalone exclusive resolution" date="1416356815" name="sTGC_standalone_residuals_exc.png" path="sTGC_standalone_residuals_exc.png" size="134802" user="ostelzer" version="1"
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META FILEATTACHMENT attachment="sTGC_residual_pixel.png" attr="" comment="sTGC residual with respect to a pixel track" date="1416423425" name="sTGC_residual_pixel.png" path="sTGC_residual_pixel.png" size="46562" user="ostelzer" version="1"

Revision 82014-11-19 - OliverStelzerChilton

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Public Talks at conferences

Public Plots

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Fig. 2: Inclusive sTGC residual
The reference track is built from all four hits in the sTGC quadruplet.
sTGC_standalone_residuals_inc.png
Fig. 2: Exclusive sTGC residual
The reference track is built from three hits in the sTGC quadruplet, excluding the first hit for which the residual is computed.
sTGC_standalone_residuals_exc.png
 

Combined Results and Plots

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META FILEATTACHMENT attachment="mm_single_plane_spatial_resolution.png" attr="" comment="MM single plane spatial resolution vs incident angle" date="1416271073" name="mm_single_plane_spatial_resolution.png" path="mm_single_plane_spatial_resolution.png" size="19584" user="ostelzer" version="1"
META FILEATTACHMENT attachment="mmsw_precision_coordinate.png" attr="" comment="MMSW precision coordinate resolution" date="1416271148" name="mmsw_precision_coordinate.png" path="mmsw_precision_coordinate.png" size="37157" user="ostelzer" version="1"
META FILEATTACHMENT attachment="mmsw_second_coordinate.png" attr="" comment="MMSW second coordinate resolution" date="1416271190" name="mmsw_second_coordinate.png" path="mmsw_second_coordinate.png" size="42073" user="ostelzer" version="1"
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META FILEATTACHMENT attachment="sTGC_standalone_residuals_inc.png" attr="" comment="sTGC standalone inclusive resolution" date="1416356769" name="sTGC_standalone_residuals_inc.png" path="sTGC_standalone_residuals_inc.png" size="119560" user="ostelzer" version="1"
META FILEATTACHMENT attachment="sTGC_standalone_residuals_exc.png" attr="" comment="sTGC standalone exclusive resolution" date="1416356815" name="sTGC_standalone_residuals_exc.png" path="sTGC_standalone_residuals_exc.png" size="134802" user="ostelzer" version="1"

Revision 72014-11-18 - OliverStelzerChilton

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 Here is the Technical Design Report from 2013. The link also provides access to the individual figures of the TDR.

Conference Contributions

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Here is a list of Muon System talks given at conferences.
 

MicroMegas Results and Plots

MM Chamber Construction

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Public Talks at conferences

Public Plots

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Fig. 1: Spatial resolution of a single Micromegas chamber vs incident angle
Spatial resolution using the charge centroid method (blue triangles), the μTPC method (full red circles) and the combination of the two (black open circles) as a function of the particle incident angle. The resolution is obtained from the residual distribution of the hit position difference between two Micromegas chambers separated by a small distance.
mm_single_plane_spatial_resolution.png
Fig. 2: Spatial resolution of precision coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_precision_coordinate.png
Fig. 2: Spatial resolution of second coordinate of the MMSW
The MMSW is the Micromegas Quadruplet Prototype.
mmsw_second_coordinate.png
 
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sTGC Results and Plots

sTGC Chamber Construction

Public Talks at conferences

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<!-- Once this page has been reviewed, please add the name and the date e.g. StephenHaywood - 31 Oct 2006 -->
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META FILEATTACHMENT attachment="mm_single_plane_spatial_resolution.png" attr="" comment="MM single plane spatial resolution vs incident angle" date="1416271073" name="mm_single_plane_spatial_resolution.png" path="mm_single_plane_spatial_resolution.png" size="19584" user="ostelzer" version="1"
META FILEATTACHMENT attachment="mmsw_precision_coordinate.png" attr="" comment="MMSW precision coordinate resolution" date="1416271148" name="mmsw_precision_coordinate.png" path="mmsw_precision_coordinate.png" size="37157" user="ostelzer" version="1"
META FILEATTACHMENT attachment="mmsw_second_coordinate.png" attr="" comment="MMSW second coordinate resolution" date="1416271190" name="mmsw_second_coordinate.png" path="mmsw_second_coordinate.png" size="42073" user="ostelzer" version="1"

Revision 62014-11-14 - StephanieZimmermann

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 The plots shown below have been approved by the NSW Project and may be shown by ATLAS speakers at conferences. Do not add plots on your own but contact the NSW project leader to arrange a plot approval.

Plot Approval Procedure

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Plots concerning NSW detector performance including test beam and/or module-0 results can only be shown publicly if approved. Plots are approved by the NSW project leader after a discussion in the NSW Steering Group. Before requesting the approval of a plot, it should be presented, discussed and agreed on in the appropriate MicroMegas or sTGC Weekly meeting.
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Plots and data concerning NSW detector performance, including test beam and/or module-0 results, can only be shown publicly if approved. Plots/results are approved by the NSW project leader after a discussion in the NSW Steering Group. Before requesting the approval of a plot, it should be presented, discussed and agreed on in the appropriate community, eg using the MicroMegas or sTGC Weekly meetings.
 
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The plot approval procedure is in place since October 2014, it was defined together with and endorsed by the Muon IB in its session on October 16 2014.
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The official plot approval procedure is in place since October 2014, it was defined together with and endorsed by the Muon IB in its session on October 16 2014.
 

Technical Design Report

Here is the Technical Design Report from 2013. The link also provides access to the individual figures of the TDR.

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Conference Contributions

 

MicroMegas Results and Plots

MM Chamber Construction

Public Talks at conferences

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Electronics

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MicroMegas Results and Plots

MM Chamber Construction

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Public Talks at conferences

Public Plots

 
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MM Performance

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Public Talks at conferences

Public Plots

 
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sTGC Results and Plots

sTGC Chamber Construction

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Public Talks at conferences

Public Plots

 
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sTGC Performance

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Public Talks at conferences

Public Plots

 
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 The plots shown below have been approved by the NSW Project and may be shown by ATLAS speakers at conferences. Do not add plots on your own but contact the NSW project leader to arrange a plot approval.

Plot Approval Procedure

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Plots concerning NSW detector performance including test beam and/or module-0 results can only be shown publicly if approved. Plots are approved by the NSW project leader after a discussion in the NSW Steering Group. Before requesting the approval of a plot, it should be presented and discussed in the appropriate MicroMegas or sTGC Weekly meeting.
>
>
Plots concerning NSW detector performance including test beam and/or module-0 results can only be shown publicly if approved. Plots are approved by the NSW project leader after a discussion in the NSW Steering Group. Before requesting the approval of a plot, it should be presented, discussed and agreed on in the appropriate MicroMegas or sTGC Weekly meeting.
  The plot approval procedure is in place since October 2014, it was defined together with and endorsed by the Muon IB in its session on October 16 2014.

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Introduction

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The plots shown below have been approved by the NSW Project and may be shown by ATLAS speakers at conferences. Do not add plots on your own but contact the NSW project leader to arrange a plot approval.
>
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The plots shown below have been approved by the NSW Project and may be shown by ATLAS speakers at conferences. Do not add plots on your own but contact the NSW project leader to arrange a plot approval.
 

Plot Approval Procedure

Plots concerning NSW detector performance including test beam and/or module-0 results can only be shown publicly if approved. Plots are approved by the NSW project leader after a discussion in the NSW Steering Group. Before requesting the approval of a plot, it should be presented and discussed in the appropriate MicroMegas or sTGC Weekly meeting.
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MicroMegas Results and Plots

MM Chamber Construction

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Fig. 1: Here goes the plot title/short content description and the upload date
And here goes the detailed and background information
MyPlotName.png
 

MM Performance

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Fig. 1: Here goes the plot title/short content description and the upload date
And here goes the detailed and background information
MyPlotName.png
 

sTGC Results and Plots

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sTGC Chamber construction

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sTGC Chamber Construction

Fig. 1: Here goes the plot title/short content description and the upload date
And here goes the detailed and background information
MyPlotName.png
 

sTGC Performance

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Fig. 1: Here goes the plot title/short content description and the upload date
And here goes the detailed and background information
MyPlotName.png
 

Combined Results and Plots

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Revision 22014-10-31 - StephanieZimmermann

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Introduction

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The plots shown below have been approved by the NSW Project and may be shown by ATLAS speakers at conferences. Do not add plots on your own but contact the NSW project leader to arrange a plot approval.

Plot Approval Procedure

Plots concerning NSW detector performance including test beam and/or module-0 results can only be shown publicly if approved. Plots are approved by the NSW project leader after a discussion in the NSW Steering Group. Before requesting the approval of a plot, it should be presented and discussed in the appropriate MicroMegas or sTGC Weekly meeting.
 
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<!-- Add an introduction here, describing the purpose of this topic. -->
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The plot approval procedure is in place since October 2014, it was defined together with and endorsed by the Muon IB in its session on October 16 2014.
 

Technical Design Report

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Here is the Technical Design Report from 2013.
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Here is the Technical Design Report from 2013. The link also provides access to the individual figures of the TDR.

MicroMegas Results and Plots

MM Chamber Construction

MM Performance

sTGC Results and Plots

sTGC Chamber construction

sTGC Performance

Combined Results and Plots

 

<!-- For significant updates to the topic, consider adding your 'signature' (beneath this editing box) -->
Major updates:
Changed:
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-- BeateHeinemann - 2014-10-31
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-- Main.Stephanie.Zimmermann - 2014-10-31
 
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Revision 12014-10-31 - BeateHeinemann

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META TOPICPARENT name="AtlasResults"

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NSWPublicResults

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Introduction

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Technical Design Report

Here is the Technical Design Report from 2013.


<!-- For significant updates to the topic, consider adding your 'signature' (beneath this editing box) -->
Major updates:
-- BeateHeinemann - 2014-10-31

<!-- Person responsible for the page: 
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Or replace the complete REVINFO tag (including percentages symbols) with a name in the form TwikiUsersName -->
Responsible: BeateHeinemann
Subject: public
<!-- Once this page has been reviewed, please add the name and the date e.g. StephenHaywood - 31 Oct 2006 -->
 
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