Performance of a Large-Area GEM Detector Prototype for the Upgrade of the CMS Muon Endcap System
- Abbaneo, D. et al
- arXiv:1412.0228
 | A quadrant of the CMS muon system with proposed GE1/1 upgrade in red. |
 | GEM and CSC system in each station enlarge the lever arm for a bending angle measurement unaffected by multiple scattering. |
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 | (a) Simulation of the bending angle measurement in the first endcap station (GE1/1-ME1/1) for soft ($\sim$5 GeV) and hard ($\sim$20 GeV) muons\cite{Michael}. (b) Simulation of the inclusive muon trigger rate expected for the LHC Phase 2 as function of the Level-1 p$_{T}$ trigger threshold in \mbox{$1.5 < \mid\eta\mid < 2.2$.}Caption not extracted |
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 | Construction of the 1m-long large-area GE1/1-III prototype in three steps. The instrumentation with APV front-end hybrids and the numbering of eta sectors is shown in (b).Caption not extracted |
 | Experimental setup in the beam line MT6.2-B at FTBF. |
 | GE1/1 cluster charge distribution at 3250V fitted with Landau function. |
 | Strip multiplicity in GE1/1 clusters at 3250V. |
 | Mean strip multiplicity increases with high voltage. |
 | Detection efficiency with different strip threshold cut on pedestal width. |
 | Response uniformity in seven $\eta$-sectors for three different APV positions, i.e. Upper, Middle, and Lower at 3250V. |
 | Charge uniformity for different $\eta$ sectors at 3250V using single-strip single-cluster events. |
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 | Beam profiles: (a) 32 GeV hadron beam. (b) 120 GeV proton beam.Caption not extracted |
 | Correlation of GE1/1 detector hits with hits in first tracker detector. |
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 | Residuals for tracker 1 in $\varphi$(a) Inclusive residual with width \mbox{$\sigma$ = 21 $\mu$rad} and (b) Exclusive residual with width $\sigma$ = 75 $\mu$rad.Caption not extracted |
 | Residuals and angular resolution of the tracking detectors |
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 | (a) Inclusive GE1/1 residual with $\sigma$ = 110.7 $\mu$rad and (b) Exclusive GE1/1 residual with $\sigma$ = 137.9 $\mu$rad using full pulse height information and double-Gaussian fits.Caption not extracted |
 | Resolutions of the GE1/1 detector at the center of sector 5 for different voltages using full pulse height information. |
 | Detection efficiency using VFAT-like binary hit data with three different thresholds. |
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 | (a) Inclusive GE1/1 residual with $\sigma$ = 122.8 $\mu$rad and (b) Exclusive GE1/1 residual with $\sigma$ = 152.5 $\mu$rad using binary hit reconstruction and double-Gaussian fits.Caption not extracted |
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 | (a) and (b) Scatter plots of exclusive residual vs. $\eta$ for 2-strip and 3-strip cluster, respectively, for combined HV Scan data. (c) and (d) Scatter plots of exclusive residual vs. $\eta$ for all strip cluster multiplicities before and after correction, respectively.Caption not extracted |
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 | (a) Resolutions before and after correction for 2-strip cluster. (b) Resolutions before and after correction for 3-strip cluster. (c) Resolutions before and after correction for 2-strip, 3-strip, and 4-strip cluster for high voltage scan. |
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