# Introduction

This page lists the public plots produced within the Tile Calorimeter calibration group. The results present The HV stability and temperature as well as LASER / HV / Cesium comparison.

# Temperature and HV stability (2011)

Stability of the PMT high voltage with respect to its set value, averaging over all PMTs for two periods of 3 and 6 months (top) separated by the maintenance period. The distribution of the differences of the measured and the set HV values for all PMTs over the period considered is also shown (bottom).
Contact: Diane.Cinca@cern.ch

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Stability of the temperature, as measured at one PMT in each drawer, averaging over all drawers and presented for two periods of 3 and 6 months separated by the maintenance period (top). The distribution of the values for individual drawers over the whole period is also shown (bottom).}
Contact: Diane.Cinca@cern.ch

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# HV stability

The ATLAS Tile Calorimeter contains 256 modules and almost 10 000 channels, each of them being fed by a specific High Voltage (HV). A common input HV (HVin) is provided to every module (830 or 950 V), and is subsequently adjusted to the desired HV (HVset) for each PMT by the regulation loop located on the HVopto electronic card. HVset value is set via the HVmicro card communicating with the HVopto cards with a frequency of ~1 Hz. Once regulated, the value of the HV is read (HVread), and sent to the HVmicro card to be stored in databases, and then the regulated HV provided to the PMT (HVout). HVmicro card handles the communication with the Detector Control System (DCS), mediated by the CANbus (frequency ~ 0.1 Hz).
Contact: Loic Valery lvalery@cern.ch

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Distribution of $\mu_i$ for all the channels of the Tile Calorimeter. $\mu_i$ is the mean of the gaussian fit of $\Delta HV=HV_i^{\text{meas}}-HV_i^{\text{set}}$ for a given channel $i$ (at least 10000 entries by channel). This distribution shows that the regulation loop behaves very well, and ensures a good agreement between the setting $HV_i^{\text{set}}$ and the applied high voltage $HV_i^{\text{meas}}$. The channels flagged as unstable (less than a few 0.1 \% of the whole channels of the Tile Calorimeter), belonging to a module switched off or in emergency mode, and the MBTS channels are removed. Consequently 9352 channels are used in this plot. Maintenance periods are also removed.
Contact: Loic Valery lvalery@cern.ch

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Evolution of $\Delta HV = HV_i^{\text{meas}}-HV_i^{\text{set}}$ for the four partitions of the Tile Calorimeter. One point represents the averaged value of $\Delta HV$ over the whole partition during 3 days. For a given partition, the variation of the distribution is lower than 0.05 V, demonstrating the stability of the HV during the whole 2012-2013 run. The channels flagged as unstable (less than a few 0.1 \% of the whole channels of the Tile Calorimeter), belonging to a module switched off or in emergency mode, and the MBTS channels are removed. Consequently 9352 channels are used in this plot. Maintenance periods are also removed.
Contact: Loic Valery lvalery@cern.ch

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Distribution of $\mu_i^G$ for the channels of the Tile Calorimeter (almost 10000 channels). $\mu_i^G$ is the mean of the gaussian fit of the $\Delta G$ (gain variation) distribution for a given channel $i$. The gain is computed using the general formula relating the applied HV and the gain of the PMT. This distribution shows that the channels verifying HV quality criteria behave very well with respect to the gain. The channels flagged as unstable (less than a few 0.1 \% of the whole channels of the Tile Calorimeter), belonging to a module switched off or in emergency mode, and the MBTS channels are removed. Consequently 9352 channels are used in this plot. Maintenance periods are also removed.
Contact: Loic Valery lvalery@cern.ch

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Evolution of gain computed from the HV for the four partitions of the Tile Calorimeter. One point represents the averaged value of the gain over the whole partition during 3 days. This plot illustrates that the gain is stable within 0.05 \% during the whole 2012-2013 run. The channels flagged as unstable (less than a few 0.1 \% of the whole channels of the Tile Calorimeter), belonging to a module switched off or in emergency mode, and the MBTS channels are removed. Consequently 9352 channels are used in this plot. Maintenance periods are also removed.
Contact: Loic Valery lvalery@cern.ch

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Distribution of μiΔHV for all stable channels in 2015. μiΔHV is the average value of ∆HVi in the stable periods and ∆HVi is the difference between HVimeasand HVireq .The left-most and right-most bins are the total number of channels with μiΔHV≤−10 V and μiΔHV≥ 10 V respectively.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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Distribution of σiΔHV (standard variation of all values of ∆HVi) for all channels in 2015. The right-most bin is the total number of channels with σi≥ 1 V. The zero sigma channels are LBA10 and EBC21 which were off during the full period.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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Distribution of μiΔHV for all stable channels in 2016. μiΔHV is the average value of ∆HVi in the stable periods and ∆HVi is the difference between HVimeasand HVireq .The left-most and right-most bins are the total number of channels with μiΔHV≤−10 V and μiΔHV≥ 10 V respectively.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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Distribution of σiΔHV (standard variation of all values of ∆HVi) for all channels in 2016. The right-most bin is the total number of channels with σi≥ 1 V.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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Distribution of μiΔHV for all stable channels in 2017. μiΔHV is the average value of ∆HVi in the stable periods and ∆HVi is the difference between HVimeasand HVireq .The left-most and right-most bins are the total number of channels with μiΔHV≤−10 V and μiΔHV≥ 10 V respectively.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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Distribution of σiΔHV (standard variation of all values of ∆HVi) for all channels in 2017. The right-most bin is the total number of channels with σi≥ 1 V.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[png][pdf]

Distribution of μiΔHV for all stable channels in 2018. μiΔHV is the average value of ∆HVi in the stable periods and ∆HVi is the difference between HVimeasand HVireq .The left-most and right-most bins are the total number of channels with μiΔHV≤−10 V and μiΔHV≥ 10 V respectively.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[png][pdf]

Distribution of σiΔHV (standard variation of all values of ∆HVi) for all channels in 2018. The right-most bin is the total number of channels with σi≥ 1 V.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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History of the power supplies status for all TileCal in 2015. Dark green means HVinat −830V, bright green at −950V, black is off, yellow is unknown HVinvalue, blue is not regulated mode. Asterisk indicates the problematic modules.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

History of the power supplies status for all TileCal in 2016. Dark green means HVinat −830V, bright green at −950V, black is off, yellow is unknown HVinvalue, blue is not regulated mode. Asterisk indicates the problematic modules.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

History of the power supplies status for all TileCal in 2017. Dark green means HVinat −830V, bright green at −950V, black is off, yellow is unknown HVinvalue, blue is not regulated mode. Asterisk indicates the problematic modules.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

History of the power supplies status for all TileCal in 2018. Dark green means HVinat −830V, bright green at −950V, black is off, yellow is unknown HVinvalue, blue is not regulated mode. Asterisk indicates the problematic modules.
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

Map of TileCal, with the status of all channels in 2015. Green channels are good, yellow channels are stable but with a large offset, red channels are unstable. Black channels are off and blue channels have a bad setting ( HVireq is not in the allowed range).
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

Map of TileCal, with the status of all channels in 2016. Green channels are good, yellow channels are stable but with a large offset, red channels are unstable. Black channels are off and blue channels have a bad setting ( HVireq is not in the allowed range).
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

Map of TileCal, with the status of all channels in 2017. Green channels are good, yellow channels are stable but with a large offset, red channels are unstable. Black channels are off and blue channels have a bad setting ( HVireq is not in the allowed range).
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

[pdf]

Map of TileCal, with the status of all channels in 2018. Green channels are good, yellow channels are stable but with a large offset, red channels are unstable. Black channels are off and blue channels have a bad setting ( HVireq is not in the allowed range).
Contact: Merve Nazlim Agaras merve.nazlim.agaras@cernNOSPAMPLEASE.ch David Calvet calvet@in2p3NOSPAMPLEASE.fr
Date: 29 August 2019

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# LASER / HV / Cesium comparison (2012)

Over all the HV channels of the TileCal (almost 10000 channels), 15 are detected as unstable, representing less than 0.2 % of the whole channels. The channel corresponding to the PMT30 of the module EBC64 is the one with the largest instability. This plot presents the comparison between the gain expected from the HV instability (blue dots), the one mesured by the LASER (red squares) and the cesium (greens dots) systems during the whole 2012 run. One HV point represents the averaged gain variation over one hour. The vertical structures are due to ON/OFF switchings. It can be seen that the agreement between the 3 methods is very good , meaning that even large variations can be detected and handled by the monitoring and calibration systems of the Tile Calorimeter.
Contact: Loic Valery lvalery@cern.ch

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