Charged particle detection performance of Gas Electron Multiplier (GEM) detectors for the upgrade of CMS endcap muon system at the CERN LHC

D Abbaneo ,L Ropelewski,G Saviano,A Marchioro,G Rashevski,S Ferry,S Cauwenbergh,M Van Stenis,G Passeggio,H Postema,S Banerjee,G Raffone,O Aboamer,S Salva,A Madorsky,R Sharma,S Braibant,M Naimuddin,V Barashko,F Guilloux,T Lenzi,Y Ban,S Krutelyov,A Ranieri,A Vorobyev,N Zaganidis,F Loddo,M Abi Akl,P Aspell,G De Robertis,A Puig Baranac,G De Lentdecker,B Philipps,J Bos ,A Çelik ,M Maggi ,I K Furic ,N Majumdar ,Erik Verhagen ,V Golovtsov ,A Fenyvesi ,A Ahmad ,M Hohlmann ,B Pavlov ,A Braghieri ,S Bianco ,G Endrőczi ,H R Hoorani ,W Ahmed ,B Dorney ,P Mal ,A Tatarinov ,Z Szillási ,A Castaneda ,S Roychowdhury ,M Choi ,E Oliveri ,S Nuzzo ,M Tytgat ,P Paolucci ,C Calabria ,D Piccolo ,P Barria ,L Guiducci ,P Giacomelli ,Aashaq Shah ,A Safonov ,M Dabrowski ,F Errico ,M Wang ,Supratik Mukhopadhyay ,J Talvitie ,Rui De Oliveira ,S Bally ,R Venditti ,A Colaleo ,S Muhammad ,K Höepfner ,A K Mohanty ,L M Pant ,L Litov ,A Magnani ,J Hauser ,A Conde Garcia ,G Ryu ,N Béni ,M S Ryu ,Y G Jeng ,Ajay Kumar ,J Molnár ,P E Karchin ,M Caponero ,P Vitulo ,A Cimmino ,L Benussi ,T Tuuva ,F R Cavallo ,G Mitselmakher ,P Altieri ,R Yonamine ,P Iaydjiev ,R Radogna ,S Buontempo ,I Park ,Yadan Yang ,V Bhopatkar ,M Shopova ,I Vai ,C Riccardi ,Gyorgy Bencze ,O Bouhali ,S Swain ,J Christiansen ,S Volkov ,S Choi ,M Abbrescia ,J A Merlin ,D Wang ,A Mohapatra ,Y Assran ,H Kim ,T Maerschalk ,S Dildick ,G Sultanov ,K Mandal ,A Korytov ,R Hadjiiska ,U K Yang ,P Verwilligen ,D Acosta ,J Sturdy ,C Asawatangtrakuldee ,C Caputo ,A Gutiérrez ,Francesco Peluso Cassese ,J Gilmore ,M Rodozov ,A Aleksandrov ,M Abbas ,S Czellár ,J Lee ,A Malta Rodrigues ,A Radi ,A Sharma ,I Awan ,T Kamon ,S Colafranceschi ,A Marinov ,F Zenoni ,A Zhang

doi:10.1109/nssmic.2015.7581797

Abstract

The Compact Muon Solenoid (CMS) detector is one of the two general-purpose detectors at the CERN LHC. LHC will provide exceptional high instantaneous and integrated luminosity after second long shutdown. The forward region |η| ≥ 1:5 of CMS detector will face extremely high particle rates in tens of kHz/cm2 and hence it will affect the momentum resolution, efficiency and longevity of the muon detectors. Here, η is pseudorapidity defined as η = −ln(tan(θ/2)), where θ is the polar angle measured from z-axis. To overcome these issues the CMSGEM collaboration has proposed to install new large size rate capable Triple Gas Electron Multiplier (GEM) detectors in the forward region of CMS muon system. The first set of Triple GEM detectors will be installed in the GE1/1 region (1:6 2 (70/30) and Ar/CO 2 /CF 4 (45/15/40). In 2014, good quality data was collected during test beam campaigns. In this paper, the performance of the detectors is summarized based on their tracking efficiency and time resolution.

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