Layout and assembly technique of the GEM chambers for the upgrade of the CMS first muon endcap station

Journal Article · 31 January 2019 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2018.11.061 · OSTI ID:1608240

Abbaneo, D. ^[1]; Abbas, M.; Abbrescia, M.; Abdalla, H.; Ahmad, A.; Ahmed, A.; Ahmed, W.; Ali, C.; Asghar, I.; Aspell, P.; Assran, Y.; Avila, C.; Ban, Y.; Band, R.; Bansal, S.; Bencze, G.; Beni, N.; Benussi, L.; Bhatnagar, V.; Bhopatkar, V. ; Bianco, M.; Bianco, S.; Borgonovi, L.; Bouhali, O.; Braghieri, A.; Braibant-Giacomelli, S.; Bravo, C.; Cafaro, V.; Calabria, C.; Salazar, C.; Caponero, M.; Cassese, F.; Hernandez, A.; Cavallo, F.; Cavallo, N.; Choi, Y.; Colafranceschi, S.; Colaleo, A.; Garcia, A. Conde; Dalchenko, M.; De Lentdecker, G.; Dell Olio, D.; De Robertis, G.; Dildick, S.; Dorney, B.; Endroczi, G.; Erbacher, R.; Errico, F.; Fallavollita, F.; Fontanesi, E.; Franco, M.; Giacomelli, P.; Gigli, S.; Gilmore, J.; Giordano, V.; Gola, M.; Gruchala, M.; Guiducci, L.; Gupta, R.; Gutierrez, A.; Hadjiiska, R.; Hakkarainen, T.; Hauser, J.; Heidemann, C.; Hoepfner, K.; Hohlmann, M.; Hoorani, H.; Huang, H.; Huang, Q.; Huang, T.; Iaydjiev, P.; Inseok, Y.; Irshad, A.; Jeng, Y.; Jha, V.; Juodagalvis, A.; Juska, E.; Kamon, T.; Karchin, P.; Kaur, A.; Keller, H.; Khan, W.; Kim, J.; Kim, H.; King, R.; Kumar, A.; Kumari, P.; Lacalamita, N.; Lee, J.; Lenzi, T.; Leonard, A.; Levin, A.; Li, Q.; Licciulli, F.; Litov, L.; Loddo, F.; Lohan, M.; Maggi, M.; Magnani, A.; Majumdar, N.; Malhotra, S.; Marinov, A.; Martirodonna, S.; McColl, N.; McLean, C.; Merlin, J.; Mishra, D.; Mocellin, G.; Mohamed, S.; Mohamed, T.; Molnar, J.; Moureaux, L.; Muhammad, S.; Mukhopadhyay, S.; Murtaza, S.; Naimuddin, M.; Vanegas, N.; Netrakanti, P.; Nuzzo, S.; Oliveira, R.; Pant, L.; Paolucci, P.; Park, I.; Passamonti, L.; Passeggio, G.; Pastore, C.; Pavlov, B.; Peck, A.; Petrow, H.; Philipps, B.; Piccolo, D.; Pierluigi, D.; Primavera, F.; Radogna, R.; Raffone, G.; Rahmani, M.; Ranieri, A.; Rapsevicius, V.; Rashevski, G.; Ressegotti, M.; Riccardi, C.; Rodozov, M.; Romano, E.; Roskas, C.; Rout, P.; Russo, A.; Safonov, A.; Saltzberg, D.; Saviano, G.; Shah, A. H.; Sharma, A.; Sharma, R.; Shopova, M.; Simone, F.; Singh, J. B.; Soldani, E.; Starling, E.; Sturdy, J.; Sultan, A.; Sultanov, G.; Szillasi, Z.; Thyssen, F.; Tuuva, T.; Tytgat, M.; Ujvari, B.; Vai, I.; Venditti, R.; Verwilligen, P.; Vitulo, P.; Wang, D.; Yang, Y.; Yang, U.; Yonamine, R.; Yu, I.; Zaleski, S.

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1. UCLA

Triple-GEM detector technology was recently selected by CMS for a part of the upgrade of its forward muon detector system as GEM detectors provide a stable operation in the high radiation environment expected during the future High-Luminosity phase of the Large Hadron Collider (HL-LHC). In a first step, GEM chambers (detectors) will be installed in the innermost muon endcap station in the 1.6<|η|<2.2 pseudo-rapidity region, mainly to control level-1 muon trigger rates after the second LHC Long Shutdown. These new chambers will add redundancy to the muon system in the η-region where the background rates are high, and the bending of the muon trajectories due to the CMS magnetic field is small. A novel construction technique for such chambers has been developed in such a way where foils are mounted onto a single stack and then uniformly stretched mechanically, avoiding the use of spacers and glue inside the active gas volume. We describe the layout, the stretching mechanism and the overall assembly technique of such GEM chambers.

• Research Organization: Univ. of California, Los Angeles, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Contributing Organization: CMS Collaboration
• Grant/Contract Number: SC0009937
• OSTI ID: 1608240
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Journal Issue: C Vol. 918; ISSN 0168-9002
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English