A GEM Detector System for an Upgrade of the CMS Muon Endcaps

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Figure 42: Effective gain (Geff ) and the total gain (Gtot) for different penning parameters. A comparison of the effective gain with Ar/CO2 can be seen in Fig. 43 for one penning parameter rP = 0.6. As can be seen, the effective gain reduces considerably in the case of Ar/CO2 by a factor of 1/2. However, we are using Ar/CO2/CF4 because CF4 being a fast gas gives fast response and an improved time resolution. The time resolution obtained in the case of Ar/CO2/CF4 and Ar/CO2 can be seen in Fig. 45. The average time in case of Ar/CO2/CF4 is 23 ns with a resolution of 0.5 ns while for Ar/CO2, it is 33 ns with a resolution of 1.2 ns. However, the figures in 45 do not show a realistic time resolution because we have not done a primary particle ionization simulation and it just shows the effect of usingCF4 gas. Figure 43: Effective gain comparison for Ar/CO2/CF4 and Ar/CO2 for penning parameter of 0.6 In order to study the Triple-GEM, we simulate three single GEMs and the overall gain Gtgem, is defined as : Gtgem = G1 ∗G2 ∗G3 , where G1, G2 and G3 are the single GEM gains. The Triple-GEM results compared with the gain obtained in GE1/1 prototype II of CMS is seen in the Fig. 44 for the different penning parameters. As can be seen, for a penning parameter ofrP = 0.6, a good agreement is obtained for the different overall potentials of the Triple-GEM configuration as compared to data. 41
Figure 44: Triple-GEM effective gain compared with data Figure 45: Time resolution for single electrons in the case of Ar/CO2/CF4 (left) and Ar/CO2 (right) 42
Page 1 and 2: Available on CMS information server
Page 3 and 4: Abstract This technical proposal ai
Page 5 and 6: 5.3 Simulated chamber properties .
Page 7 and 8: List of Figures 1 CMS transverse se
Page 9 and 10: 49 Simulated total L1 GEM+RPC trigg
Page 11 and 12: List of Tables 1 Performance requir
Page 13 and 14: obtained. The angular resolution is
Page 15 and 16: of the gas rigidity or discharge. S
Page 17 and 18: Figure 3: CATIA model of the CMS en
Page 19 and 20: Therefore, the physics case for add
Page 21 and 22: (r.m.s.) p /p T T ∆ (r.m.s.) T /p
Page 23 and 24: 3 Studies of small and full-scale G
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Page 27 and 28: Figure 16: VFAT2 threshold scan for
Page 29 and 30: (a) (b) Figure 19: (a) Exploded vie
Page 31 and 32: (a) (b) Figure 22: (a) The GE1/1-I
Page 33 and 34: Figure 27: GE1/1-II efficiency perf
Page 35 and 36: instrumented with GEMs, the number
Page 37 and 38: Table 3: Performance overview for a
Page 39 and 40: Figure 34: Exploded view of a Tripl
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Page 43: Figure 40: Loss rate for secondary
Page 47 and 48: Figure 46: Longitudinal view of the
Page 49 and 50: Figure 47: Simulated L1 GEM+RPC tri
Page 51 and 52: Figure 49: Simulated total L1 GEM+R
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Page 71 and 72: 7 Cooling, gas and cabling services
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Page 77 and 78: CMS Triple-GEM production GE1/1 foi
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Page 81 and 82: A twiki page (https://twiki.cern.ch
Page 83 and 84: 12 Publications 2010 2011 1. Charac
Page 85 and 86: References [1] S. Chatrchyan et al.
Page 87 and 88: Appendices 84
Page 89 and 90: Table 22: GE2/1 Mechanics GE2/1long
Page 91 and 92: Table 28: System overview: Endcap 4
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C.4 Product(s) involved 1. GE 1/1 S
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Ideal Realistic Ideal Realistic Ide
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A GEM Detector System for an Upgrade of the CMS Muon Endcaps

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