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

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Contents 1 Endcap muon system 9 1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.2 CSC (Cathode Strip Chambers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.3 RPC (Resistive Plate Chambers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.4 Muon system redundancy and extension up toη = 2.4 . . . . . . . . . . . . . . . . . . . . . . . 10 1.5 Performance requirements for high-η muon detectors . . . . . . . . . . . . . . . . . . . . . . . . 10 1.6 Present experience with MPGDs in experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.7 High-η muon detectors proposed for LS2 (2017-2018) . . . . . . . . . . . . . . . . . . . . . . . 12 2 Impact of high-η upgrade on muon reconstruction 15 2.1 Muon system redundancy and extension up toη = 2.4 . . . . . . . . . . . . . . . . . . . . . . . 15 2.2 Multiple scattering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.3 Muon track reconstruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3 Studies of small and full-scale GEM prototypes 20 3.1 Initial prototypes for choosing among MPGD technologies . . . . . . . . . . . . . . . . . . . . . 20 3.2 Triple-GEM prototypes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.3 Single-mask GEM production technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.4 Test beam measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.4.1 Data analysis and results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4.2 Standard double-mask Triple-GEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4.3 Single-mask Triple-GEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.4.4 Performance summary for small prototypes . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.5 Full-size Triple-GEM prototype . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.5.1 Prototype description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.5.2 Test beam setups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.5.3 Prototype performances in beam test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.5.4 Conclusion from measurements with full-size prototypes . . . . . . . . . . . . . . . . . . 31 3.6 Present status and improved detector assembly technique . . . . . . . . . . . . . . . . . . . . . . 31 4 Simulation studies 35 4.1 The GEM detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.2 Study of the transport parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.3 Gain studies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.4 Avalanche simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5 Muon triggering with GEM detectors in the high-η region 43 5.1 Trigger emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.2 GEM geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 1
5.3 Simulated chamber properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 5.4 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 5.5 Assembly laboratory (TIF - Tracker Integration Facility, building 186) . . . . . . . . . . . . . . . 53 5.6 Production of GEM foils and assembly of GE1/1 detector . . . . . . . . . . . . . . . . . . . . . . 54 6 Electronics system 56 6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 6.2 On-detector electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 6.2.1 The GEM chamber (from an electrical perspective) . . . . . . . . . . . . . . . . . . . . . 56 6.2.2 The front-end ASIC development - VFAT2 to VFAT3 and GdSP . . . . . . . . . . . . . . 57 6.3 Off-detector electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 6.4 System considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 6.4.1 General system view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 6.4.2 Segmentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 6.4.3 Electronics power consumption for a 3·10 chamber. . . . . . . . . . . . . . . . . . . . . . 63 6.5 Project planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 6.6 Cost: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6.6.1 On-detector costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 6.6.2 Off-detector: components for aµTCA crate . . . . . . . . . . . . . . . . . . . . . . . . . 66 6.6.3 GE1/1 system cost estimate (on and off-detector) . . . . . . . . . . . . . . . . . . . . . . 67 7 Cooling, gas and cabling services 68 7.1 Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7.2 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 8 Schedule and milestones toward GE1/1 and 2/1 installation in LS2 73 9 Budget and resources 75 10 Collaboration structure 77 11 Summary and conclusion 79 12 Publications 80 13 Conference contributions 80 Appendices 84 A Parameters describing the GEi/1 systems 85 B Integration and installation within CMS high-η envelope 87 B.1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 2
Page 1 and 2: Available on CMS information server
Page 3: Abstract This technical proposal ai
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
Page 25 and 26: Figure 11: Positions of small Tripl
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
Page 41 and 42: Figure 37: Lorentz angles for the g
Page 43 and 44: Figure 40: Loss rate for secondary
Page 45 and 46: Figure 44: Triple-GEM effective gai
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
Page 53 and 54: Ideal Realistic Ideal Realistic Ide
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Ideal Realistic Ideal Realistic Ide
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Figure 56: TIF gas system. 5.6 Prod
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6 Electronics system 6.1 Introducti
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ates and the need for compatibility
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GdSP Preamp Shaper 64 or 128 channe
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algorithm, the GemTBs input data ba
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Table 6: Power estimate for the mai
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Cost for components for 3·10 chamb
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7 Cooling, gas and cabling services
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Figure 71: Layout of the pump compr
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Figure 74: Endcap cooling system, m
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CMS Triple-GEM production GE1/1 foi
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Table 18: Budget and resources base
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A twiki page (https://twiki.cern.ch
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12 Publications 2010 2011 1. Charac
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References [1] S. Chatrchyan et al.
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Appendices 84
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Table 22: GE2/1 Mechanics GE2/1long
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Table 28: System overview: Endcap 4
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Notice that pivot and feet must bot
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C.4 Product(s) involved 1. GE 1/1 S
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A GEM Detector System for an Upgrade of the CMS Muon Endcaps

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