CMS Silicon Strip Performance Results 2019

Contact: The CMS Tracker DPG conveners (cms-dpg-conveners-tracker@cernNOSPAMPLEASE.ch)
and the Silicon Strip Tracker Performance hypernews (hn-cms-trackerperformance@cernNOSPAMPLEASE.ch).
Public CDS Record: CMS DP-2021/003

Figure in PNG format (click on plot to get PDF) Description
Fraction of the active components for the CMS Silicon Strip detector as a function of the delivered LHC integrated luminosity. Each point represents a single run. Sources of inactive components include: read-out channels excluded from the cabling (typically FEDs), unpowered groups of modules and single APV25 chips or groups of strips masked from the offline reconstruction by a Prompt Calibration loop algorithm [1] identifying very noisy channels based on the median occupancy. The fraction of functional component was very stable during LHC Run 2 and amounts to about 96% of the total number of channels.
Fraction of the active components of the CMS Silicon Strip detector broken down by sub-detector, as a function of the delivered LHC integrated luminosity. Each point represents a single run. Sources of bad components include: read-out channels excluded from the cabling (typically FEDs), unpowered group of modules and single APV25 chips or group of strips masked from the offline reconstruction by a Prompt Calibration loop algorithm [1] identifying very noisy channels based on the median channel occupancy. The fraction of the active component was very stable during LHC Run 2. The larger variations of about 2% observed in the TID- sub-detector are caused by faulty power groups excluded from readout during 2016 and at the beginning of 2017. Being TID a smaller detector it is more susceptible to larger variations even for a low number of additionally lost modules. The difference of a few percents observed between TID+ and TID- sub-detectors is caused by a problematic cooling loop present in TID-.

Figure in PNG format (click on plot to get PDF) Description
Fraction of bad components for the CMS Silicon Strip detector as a function of the delivered LHC integrated luminosity. Each point represents a single run. Sources of bad components include: read-out channels excluded from the cabling (typically FEDs), unpowered groups of modules and single APV25 chips or groups of strips masked from the offline reconstruction by a Prompt Calibration loop algorithm [1] identifying very noisy channels based on the median occupancy. The fraction of the bad components was very stable during LHC Run 2 and amounts to about 4% of the total number of channels.
Fraction of bad components of the CMS Silicon Strip detector broken down by sub-detector, as a function of the delivered LHC integrated luminosity. Each point represents a single run. Sources of bad components include: read-out channels excluded from the cabling (typically FEDs), unpowered group of modules and single APV25 chips or group of strips masked from the offline reconstruction by a Prompt Calibration loop algorithm [1] identifying very noisy channels based on the median channel occupancy. The fraction of the bad components was very stable during LHC Run 2. The larger variations of about 2% observed in the TID- sub-detector are caused by faulty power groups excluded from readout during 2016 and at the beginning of 2017. Being TID a smaller detector it is more susceptible to larger variations even for a low number of additionally lost modules. The difference of a few percents observed between TID+ and TID- sub-detectors is caused by a problematic cooling loop present in TID-.
Cluster charge normalized to the transversed silicon length after offline calibration for each partition of the Silicon Strip detector as a function of the delivered LHC integrated luminosity. Each point represents a single run. Only clusters used to build a track are considered. The Most Probable Value (MPV) from a Landau fit is shown. During local reconstruction a correction is applied to the strip charge signal in order to guarantee stability over time of the cluster charge MPV. Large fluctuations in the cluster charge in the first 20/fb of 2016 data are caused by the saturation of the pre-amplifier of the APV chip [2,3]. The effect had a strong instantaneous luminosity dependence and resulted in the deviation from a Landau distribution. The effect will be partially mitigated with the updated calibration derived for the Legacy reprocessing of the Run 2 data the CMS collaboration has undertaken. The later discontinuities in the trend are due to the updates of the gain and noise/pedestal values.

References

[1] G. Cerminara, B. van Besien "Automated workflows for critical time-dependent calibrations at the CMS experiment" J.Phys.Conf.Ser. 664 (2015) no. 7, 072009 doi:10.1088/1742-6596/664/7/072009
[2] E. Butz “Operation and Performance of the CMS Outer Tracker” PoS Vertex 2017 (2018) 013 doi:10.22323/1.309.0013
[3] Intenal CMS reference CMS Silicon Strip Tracker performance in 2016

-- MarcoMusich - 2019-10-07

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Strip_ChargePerCM_Run2_delivered_prompt_Nb1200_open.pdf r1 manage 274.3 K 2019-10-09 - 15:57 MarcoMusich Updated Cluster charge and S/N
PNGpng Strip_ChargePerCM_Run2_delivered_prompt_Nb1200_open.png r1 manage 162.1 K 2019-10-09 - 15:57 MarcoMusich Updated Cluster charge and S/N
PDFpdf Strip_StoN_Run2_delivered_prompt_Nb1200_open.pdf r1 manage 259.1 K 2019-10-09 - 15:57 MarcoMusich Updated Cluster charge and S/N
PNGpng Strip_StoN_Run2_delivered_prompt_Nb1200_open.png r1 manage 131.2 K 2019-10-09 - 15:57 MarcoMusich Updated Cluster charge and S/N
PDFpdf run2_stripBadComponent.pdf r1 manage 261.4 K 2019-10-09 - 16:15 MarcoMusich Updates Strip Bad Components trends
PNGpng run2_stripBadComponent.png r1 manage 123.1 K 2019-10-09 - 16:15 MarcoMusich Updates Strip Bad Components trends
Unknown file formatroot run2_stripBadComponent.root r1 manage 97.5 K 2021-02-04 - 15:28 TanjaSusa  
PDFpdf run2_stripBadComponent_All.pdf r1 manage 55.7 K 2019-10-09 - 16:15 MarcoMusich Updates Strip Bad Components trends
PNGpng run2_stripBadComponent_All.png r1 manage 42.6 K 2019-10-09 - 16:15 MarcoMusich Updates Strip Bad Components trends
Unknown file formatroot run2_stripBadComponent_All.root r1 manage 20.7 K 2021-02-04 - 15:28 TanjaSusa  
PDFpdf run2_stripFuncionalComponent.pdf r1 manage 259.3 K 2019-10-09 - 16:56 MarcoMusich Fraction of functional components
PNGpng run2_stripFunctionalComponent.png r1 manage 107.0 K 2019-10-09 - 16:56 MarcoMusich Fraction of functional components
PDFpdf run2_stripFunctionalComponent_All.pdf r1 manage 55.6 K 2019-10-09 - 16:56 MarcoMusich Fraction of functional components
PNGpng run2_stripFunctionalComponent_All.png r1 manage 43.7 K 2019-10-09 - 16:56 MarcoMusich Fraction of functional components
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Topic revision: r10 - 2021-04-08 - MarcoMusich
 
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