Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system

D. Abbaneo, M. Abbas, M. Abbrescia, A. A. Abdelalim, M. Abi Akl, W. Ahmed, W. Ahmed, P. Altieri, R. Aly, C. Asawatangtrakuldee, A. Ashfaq, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, P. Barria, L. Benussi, V. BhopatkarS. Bianco, J. Bos, O. Bouhali, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F. R. Cavallo, A. Celik, M. Choi, K. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, M. M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. De Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Fabrice, M. Ferrini, S. Ferry, P. Giacomelli, J. Gilmore, L. Guiducci, A. Gutierrez, R. M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, Y. G. Jeng, T. Kamon, P. E. Karchin, H. S. Kim, S. Krutelyov, A. Kumar, J. Lee, T. Lenzi, L. Litov, F. Loddo, T. Maerschalk, G. Magazzu, M. Maggi, Y. Maghrbi, A. Magnani, N. Majumdar, P. K. Mal, K. Mandal, A. Marchioro, A. Marinov, J. A. Merlin, A. K. Mohanty, A. Mohapatra, S. Muhammad, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L. M. Pant, P. Paolucci, I. Park, G. Passeggio, B. Pavlov, B. Philipps, M. Phipps, D. Piccolo, H. Postema, G. Pugliese, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, S. Ramkrishna, A. Ranieri, C. Riccardi, A. Rodrigues, L. Ropelewski, S. Roychowdhury, M. S. Ryu, G. Ryu, A. Safonov, A. Sakharov, S. Salva, G. Saviano, A. Sharma, S. K. Swain, J. P. Talvitie, C. Tamma, A. Tatarinov, N. Turini, T. Tuuva, J. Twigger, M. Tytgat, I. Vai, M. Van Stenis, R. Venditi, E. Verhagen, P. Verwilligen, P. Vitulo, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the 1.5 <| η |< 2.2 region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 μrad pitch arranged in eight η-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO2 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 μrad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 ± 0.2 (stat)]%. The azimuthal resolution is found to be [123.5 ± 1.6 (stat)] μrad when operating in the center of the efficiency plateau and using full pulse height information. The resolution can be slightly improved by ∼ 10 μrad when correcting for the bias due to discrete readout strips. The CMS upgrade design calls for readout electronics with binary hit output. When strip clusters are formed correspondingly without charge-weighting and with fixed hit thresholds, a position resolution of [136.8 ± 2.5 stat] μrad is measured, consistent with the expected resolution of strip-pitch/equation μrad. Other η-sectors of the detector show similar response and performance.

Original languageEnglish
Title of host publication2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479960972
DOIs
Publication statusPublished - Mar 10 2016
EventIEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014 - Seattle, United States
Duration: Nov 8 2014Nov 15 2014

Other

OtherIEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014
CountryUnited States
CitySeattle
Period11/8/1411/15/14

Fingerprint

Mesons
photomultiplier tubes
muons
strip
Gases
prototypes
Electrons
readout
detectors
gases
plateaus
sectors
shutdowns
pulse amplitude
high voltages
Technology
spatial resolution
actuators
thresholds
output

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

Cite this

Abbaneo, D., Abbas, M., Abbrescia, M., Abdelalim, A. A., Abi Akl, M., Ahmed, W., ... Zhang, A. (2016). Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system. In 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014 [7431249] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/NSSMIC.2014.7431249

Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system. / Abbaneo, D.; Abbas, M.; Abbrescia, M.; Abdelalim, A. A.; Abi Akl, M.; Ahmed, W.; Ahmed, W.; Altieri, P.; Aly, R.; Asawatangtrakuldee, C.; Ashfaq, A.; Aspell, P.; Assran, Y.; Awan, I.; Bally, S.; Ban, Y.; Banerjee, S.; Barria, P.; Benussi, L.; Bhopatkar, V.; Bianco, S.; Bos, J.; Bouhali, O.; Braibant, S.; Buontempo, S.; Calabria, C.; Caponero, M.; Caputo, C.; Cassese, F.; Castaneda, A.; Cauwenbergh, S.; Cavallo, F. R.; Celik, A.; Choi, M.; Choi, K.; Choi, S.; Christiansen, J.; Cimmino, A.; Colafranceschi, S.; Colaleo, A.; Conde Garcia, A.; Dabrowski, M. M.; De Lentdecker, G.; De Oliveira, R.; De Robertis, G.; Dildick, S.; Dorney, B.; Elmetenawee, W.; Fabrice, G.; Ferrini, M.; Ferry, S.; Giacomelli, P.; Gilmore, J.; Guiducci, L.; Gutierrez, A.; Hadjiiska, R. M.; Hassan, A.; Hauser, J.; Hoepfner, K.; Hohlmann, M.; Hoorani, H.; Jeng, Y. G.; Kamon, T.; Karchin, P. E.; Kim, H. S.; Krutelyov, S.; Kumar, A.; Lee, J.; Lenzi, T.; Litov, L.; Loddo, F.; Maerschalk, T.; Magazzu, G.; Maggi, M.; Maghrbi, Y.; Magnani, A.; Majumdar, N.; Mal, P. K.; Mandal, K.; Marchioro, A.; Marinov, A.; Merlin, J. A.; Mohanty, A. K.; Mohapatra, A.; Muhammad, S.; Mukhopadhyay, S.; Naimuddin, M.; Nuzzo, S.; Oliveri, E.; Pant, L. M.; Paolucci, P.; Park, I.; Passeggio, G.; Pavlov, B.; Philipps, B.; Phipps, M.; Piccolo, D.; Postema, H.; Pugliese, G.; Puig Baranac, A.; Radi, A.; Radogna, R.; Raffone, G.; Ramkrishna, S.; Ranieri, A.; Riccardi, C.; Rodrigues, A.; Ropelewski, L.; Roychowdhury, S.; Ryu, M. S.; Ryu, G.; Safonov, A.; Sakharov, A.; Salva, S.; Saviano, G.; Sharma, A.; Swain, S. K.; Talvitie, J. P.; Tamma, C.; Tatarinov, A.; Turini, N.; Tuuva, T.; Twigger, J.; Tytgat, M.; Vai, I.; Van Stenis, M.; Venditi, R.; Verhagen, E.; Verwilligen, P.; Vitulo, P.; Wang, D.; Wang, M.; Yang, U.; Yang, Y.; Yonamine, R.; Zaganidis, N.; Zenoni, F.; Zhang, A.

2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014. Institute of Electrical and Electronics Engineers Inc., 2016. 7431249.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abbaneo, D, Abbas, M, Abbrescia, M, Abdelalim, AA, Abi Akl, M, Ahmed, W, Ahmed, W, Altieri, P, Aly, R, Asawatangtrakuldee, C, Ashfaq, A, Aspell, P, Assran, Y, Awan, I, Bally, S, Ban, Y, Banerjee, S, Barria, P, Benussi, L, Bhopatkar, V, Bianco, S, Bos, J, Bouhali, O, Braibant, S, Buontempo, S, Calabria, C, Caponero, M, Caputo, C, Cassese, F, Castaneda, A, Cauwenbergh, S, Cavallo, FR, Celik, A, Choi, M, Choi, K, Choi, S, Christiansen, J, Cimmino, A, Colafranceschi, S, Colaleo, A, Conde Garcia, A, Dabrowski, MM, De Lentdecker, G, De Oliveira, R, De Robertis, G, Dildick, S, Dorney, B, Elmetenawee, W, Fabrice, G, Ferrini, M, Ferry, S, Giacomelli, P, Gilmore, J, Guiducci, L, Gutierrez, A, Hadjiiska, RM, Hassan, A, Hauser, J, Hoepfner, K, Hohlmann, M, Hoorani, H, Jeng, YG, Kamon, T, Karchin, PE, Kim, HS, Krutelyov, S, Kumar, A, Lee, J, Lenzi, T, Litov, L, Loddo, F, Maerschalk, T, Magazzu, G, Maggi, M, Maghrbi, Y, Magnani, A, Majumdar, N, Mal, PK, Mandal, K, Marchioro, A, Marinov, A, Merlin, JA, Mohanty, AK, Mohapatra, A, Muhammad, S, Mukhopadhyay, S, Naimuddin, M, Nuzzo, S, Oliveri, E, Pant, LM, Paolucci, P, Park, I, Passeggio, G, Pavlov, B, Philipps, B, Phipps, M, Piccolo, D, Postema, H, Pugliese, G, Puig Baranac, A, Radi, A, Radogna, R, Raffone, G, Ramkrishna, S, Ranieri, A, Riccardi, C, Rodrigues, A, Ropelewski, L, Roychowdhury, S, Ryu, MS, Ryu, G, Safonov, A, Sakharov, A, Salva, S, Saviano, G, Sharma, A, Swain, SK, Talvitie, JP, Tamma, C, Tatarinov, A, Turini, N, Tuuva, T, Twigger, J, Tytgat, M, Vai, I, Van Stenis, M, Venditi, R, Verhagen, E, Verwilligen, P, Vitulo, P, Wang, D, Wang, M, Yang, U, Yang, Y, Yonamine, R, Zaganidis, N, Zenoni, F & Zhang, A 2016, Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system. in 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014., 7431249, Institute of Electrical and Electronics Engineers Inc., IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014, Seattle, United States, 11/8/14. https://doi.org/10.1109/NSSMIC.2014.7431249
Abbaneo D, Abbas M, Abbrescia M, Abdelalim AA, Abi Akl M, Ahmed W et al. Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system. In 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014. Institute of Electrical and Electronics Engineers Inc. 2016. 7431249 https://doi.org/10.1109/NSSMIC.2014.7431249
Abbaneo, D. ; Abbas, M. ; Abbrescia, M. ; Abdelalim, A. A. ; Abi Akl, M. ; Ahmed, W. ; Ahmed, W. ; Altieri, P. ; Aly, R. ; Asawatangtrakuldee, C. ; Ashfaq, A. ; Aspell, P. ; Assran, Y. ; Awan, I. ; Bally, S. ; Ban, Y. ; Banerjee, S. ; Barria, P. ; Benussi, L. ; Bhopatkar, V. ; Bianco, S. ; Bos, J. ; Bouhali, O. ; Braibant, S. ; Buontempo, S. ; Calabria, C. ; Caponero, M. ; Caputo, C. ; Cassese, F. ; Castaneda, A. ; Cauwenbergh, S. ; Cavallo, F. R. ; Celik, A. ; Choi, M. ; Choi, K. ; Choi, S. ; Christiansen, J. ; Cimmino, A. ; Colafranceschi, S. ; Colaleo, A. ; Conde Garcia, A. ; Dabrowski, M. M. ; De Lentdecker, G. ; De Oliveira, R. ; De Robertis, G. ; Dildick, S. ; Dorney, B. ; Elmetenawee, W. ; Fabrice, G. ; Ferrini, M. ; Ferry, S. ; Giacomelli, P. ; Gilmore, J. ; Guiducci, L. ; Gutierrez, A. ; Hadjiiska, R. M. ; Hassan, A. ; Hauser, J. ; Hoepfner, K. ; Hohlmann, M. ; Hoorani, H. ; Jeng, Y. G. ; Kamon, T. ; Karchin, P. E. ; Kim, H. S. ; Krutelyov, S. ; Kumar, A. ; Lee, J. ; Lenzi, T. ; Litov, L. ; Loddo, F. ; Maerschalk, T. ; Magazzu, G. ; Maggi, M. ; Maghrbi, Y. ; Magnani, A. ; Majumdar, N. ; Mal, P. K. ; Mandal, K. ; Marchioro, A. ; Marinov, A. ; Merlin, J. A. ; Mohanty, A. K. ; Mohapatra, A. ; Muhammad, S. ; Mukhopadhyay, S. ; Naimuddin, M. ; Nuzzo, S. ; Oliveri, E. ; Pant, L. M. ; Paolucci, P. ; Park, I. ; Passeggio, G. ; Pavlov, B. ; Philipps, B. ; Phipps, M. ; Piccolo, D. ; Postema, H. ; Pugliese, G. ; Puig Baranac, A. ; Radi, A. ; Radogna, R. ; Raffone, G. ; Ramkrishna, S. ; Ranieri, A. ; Riccardi, C. ; Rodrigues, A. ; Ropelewski, L. ; Roychowdhury, S. ; Ryu, M. S. ; Ryu, G. ; Safonov, A. ; Sakharov, A. ; Salva, S. ; Saviano, G. ; Sharma, A. ; Swain, S. K. ; Talvitie, J. P. ; Tamma, C. ; Tatarinov, A. ; Turini, N. ; Tuuva, T. ; Twigger, J. ; Tytgat, M. ; Vai, I. ; Van Stenis, M. ; Venditi, R. ; Verhagen, E. ; Verwilligen, P. ; Vitulo, P. ; Wang, D. ; Wang, M. ; Yang, U. ; Yang, Y. ; Yonamine, R. ; Zaganidis, N. ; Zenoni, F. ; Zhang, A. / Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system. 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014. Institute of Electrical and Electronics Engineers Inc., 2016.
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title = "Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system",
abstract = "Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the 1.5 <| η |< 2.2 region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 μrad pitch arranged in eight η-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO2 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 μrad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 ± 0.2 (stat)]{\%}. The azimuthal resolution is found to be [123.5 ± 1.6 (stat)] μrad when operating in the center of the efficiency plateau and using full pulse height information. The resolution can be slightly improved by ∼ 10 μrad when correcting for the bias due to discrete readout strips. The CMS upgrade design calls for readout electronics with binary hit output. When strip clusters are formed correspondingly without charge-weighting and with fixed hit thresholds, a position resolution of [136.8 ± 2.5 stat] μrad is measured, consistent with the expected resolution of strip-pitch/equation μrad. Other η-sectors of the detector show similar response and performance.",
author = "D. Abbaneo and M. Abbas and M. Abbrescia and Abdelalim, {A. A.} and {Abi Akl}, M. and W. Ahmed and W. Ahmed and P. Altieri and R. Aly and C. Asawatangtrakuldee and A. Ashfaq and P. Aspell and Y. Assran and I. Awan and S. Bally and Y. Ban and S. Banerjee and P. Barria and L. Benussi and V. Bhopatkar and S. Bianco and J. Bos and O. Bouhali and S. Braibant and S. Buontempo and C. Calabria and M. Caponero and C. Caputo and F. Cassese and A. Castaneda and S. Cauwenbergh and Cavallo, {F. R.} and A. Celik and M. Choi and K. Choi and S. Choi and J. Christiansen and A. Cimmino and S. Colafranceschi and A. Colaleo and {Conde Garcia}, A. and Dabrowski, {M. M.} and {De Lentdecker}, G. and {De Oliveira}, R. and {De Robertis}, G. and S. Dildick and B. Dorney and W. Elmetenawee and G. Fabrice and M. Ferrini and S. Ferry and P. Giacomelli and J. Gilmore and L. Guiducci and A. Gutierrez and Hadjiiska, {R. M.} and A. Hassan and J. Hauser and K. Hoepfner and M. Hohlmann and H. Hoorani and Jeng, {Y. G.} and T. Kamon and Karchin, {P. E.} and Kim, {H. S.} and S. Krutelyov and A. Kumar and J. Lee and T. Lenzi and L. Litov and F. Loddo and T. Maerschalk and G. Magazzu and M. Maggi and Y. Maghrbi and A. Magnani and N. Majumdar and Mal, {P. K.} and K. Mandal and A. Marchioro and A. Marinov and Merlin, {J. A.} and Mohanty, {A. K.} and A. Mohapatra and S. Muhammad and S. Mukhopadhyay and M. Naimuddin and S. Nuzzo and E. Oliveri and Pant, {L. M.} and P. Paolucci and I. Park and G. Passeggio and B. Pavlov and B. Philipps and M. Phipps and D. Piccolo and H. Postema and G. Pugliese and {Puig Baranac}, A. and A. Radi and R. Radogna and G. Raffone and S. Ramkrishna and A. Ranieri and C. Riccardi and A. Rodrigues and L. Ropelewski and S. Roychowdhury and Ryu, {M. S.} and G. Ryu and A. Safonov and A. Sakharov and S. Salva and G. Saviano and A. Sharma and Swain, {S. K.} and Talvitie, {J. P.} and C. Tamma and A. Tatarinov and N. Turini and T. Tuuva and J. Twigger and M. Tytgat and I. Vai and {Van Stenis}, M. and R. Venditi and E. Verhagen and P. Verwilligen and P. Vitulo and D. Wang and M. Wang and U. Yang and Y. Yang and R. Yonamine and N. Zaganidis and F. Zenoni and A. Zhang",
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TY - GEN

T1 - Performance of a large-area GEM detector prototype for the upgrade of the CMS muon endcap system

AU - Abbaneo, D.

AU - Abbas, M.

AU - Abbrescia, M.

AU - Abdelalim, A. A.

AU - Abi Akl, M.

AU - Ahmed, W.

AU - Ahmed, W.

AU - Altieri, P.

AU - Aly, R.

AU - Asawatangtrakuldee, C.

AU - Ashfaq, A.

AU - Aspell, P.

AU - Assran, Y.

AU - Awan, I.

AU - Bally, S.

AU - Ban, Y.

AU - Banerjee, S.

AU - Barria, P.

AU - Benussi, L.

AU - Bhopatkar, V.

AU - Bianco, S.

AU - Bos, J.

AU - Bouhali, O.

AU - Braibant, S.

AU - Buontempo, S.

AU - Calabria, C.

AU - Caponero, M.

AU - Caputo, C.

AU - Cassese, F.

AU - Castaneda, A.

AU - Cauwenbergh, S.

AU - Cavallo, F. R.

AU - Celik, A.

AU - Choi, M.

AU - Choi, K.

AU - Choi, S.

AU - Christiansen, J.

AU - Cimmino, A.

AU - Colafranceschi, S.

AU - Colaleo, A.

AU - Conde Garcia, A.

AU - Dabrowski, M. M.

AU - De Lentdecker, G.

AU - De Oliveira, R.

AU - De Robertis, G.

AU - Dildick, S.

AU - Dorney, B.

AU - Elmetenawee, W.

AU - Fabrice, G.

AU - Ferrini, M.

AU - Ferry, S.

AU - Giacomelli, P.

AU - Gilmore, J.

AU - Guiducci, L.

AU - Gutierrez, A.

AU - Hadjiiska, R. M.

AU - Hassan, A.

AU - Hauser, J.

AU - Hoepfner, K.

AU - Hohlmann, M.

AU - Hoorani, H.

AU - Jeng, Y. G.

AU - Kamon, T.

AU - Karchin, P. E.

AU - Kim, H. S.

AU - Krutelyov, S.

AU - Kumar, A.

AU - Lee, J.

AU - Lenzi, T.

AU - Litov, L.

AU - Loddo, F.

AU - Maerschalk, T.

AU - Magazzu, G.

AU - Maggi, M.

AU - Maghrbi, Y.

AU - Magnani, A.

AU - Majumdar, N.

AU - Mal, P. K.

AU - Mandal, K.

AU - Marchioro, A.

AU - Marinov, A.

AU - Merlin, J. A.

AU - Mohanty, A. K.

AU - Mohapatra, A.

AU - Muhammad, S.

AU - Mukhopadhyay, S.

AU - Naimuddin, M.

AU - Nuzzo, S.

AU - Oliveri, E.

AU - Pant, L. M.

AU - Paolucci, P.

AU - Park, I.

AU - Passeggio, G.

AU - Pavlov, B.

AU - Philipps, B.

AU - Phipps, M.

AU - Piccolo, D.

AU - Postema, H.

AU - Pugliese, G.

AU - Puig Baranac, A.

AU - Radi, A.

AU - Radogna, R.

AU - Raffone, G.

AU - Ramkrishna, S.

AU - Ranieri, A.

AU - Riccardi, C.

AU - Rodrigues, A.

AU - Ropelewski, L.

AU - Roychowdhury, S.

AU - Ryu, M. S.

AU - Ryu, G.

AU - Safonov, A.

AU - Sakharov, A.

AU - Salva, S.

AU - Saviano, G.

AU - Sharma, A.

AU - Swain, S. K.

AU - Talvitie, J. P.

AU - Tamma, C.

AU - Tatarinov, A.

AU - Turini, N.

AU - Tuuva, T.

AU - Twigger, J.

AU - Tytgat, M.

AU - Vai, I.

AU - Van Stenis, M.

AU - Venditi, R.

AU - Verhagen, E.

AU - Verwilligen, P.

AU - Vitulo, P.

AU - Wang, D.

AU - Wang, M.

AU - Yang, U.

AU - Yang, Y.

AU - Yonamine, R.

AU - Zaganidis, N.

AU - Zenoni, F.

AU - Zhang, A.

PY - 2016/3/10

Y1 - 2016/3/10

N2 - Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the 1.5 <| η |< 2.2 region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 μrad pitch arranged in eight η-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO2 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 μrad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 ± 0.2 (stat)]%. The azimuthal resolution is found to be [123.5 ± 1.6 (stat)] μrad when operating in the center of the efficiency plateau and using full pulse height information. The resolution can be slightly improved by ∼ 10 μrad when correcting for the bias due to discrete readout strips. The CMS upgrade design calls for readout electronics with binary hit output. When strip clusters are formed correspondingly without charge-weighting and with fixed hit thresholds, a position resolution of [136.8 ± 2.5 stat] μrad is measured, consistent with the expected resolution of strip-pitch/equation μrad. Other η-sectors of the detector show similar response and performance.

AB - Gas Electron Multiplier (GEM) technology is being considered for the forward muon upgrade of the CMS experiment in Phase 2 of the CERN LHC. Its first implementation is planned for the GE1/1 system in the 1.5 <| η |< 2.2 region of the muon endcap mainly to control muon level-1 trigger rates after the second long LHC shutdown. A GE1/1 triple-GEM detector is read out by 3,072 radial strips with 455 μrad pitch arranged in eight η-sectors. We assembled a full-size GE1/1 prototype of 1m length at Florida Tech and tested it in 20-120 GeV hadron beams at Fermilab using Ar/CO2 70:30 and the RD51 scalable readout system. Four small GEM detectors with 2-D readout and an average measured azimuthal resolution of 36 μrad provided precise reference tracks. Construction of this largest GEM detector built to-date is described. Strip cluster parameters, detection efficiency, and spatial resolution are studied with position and high voltage scans. The plateau detection efficiency is [97.1 ± 0.2 (stat)]%. The azimuthal resolution is found to be [123.5 ± 1.6 (stat)] μrad when operating in the center of the efficiency plateau and using full pulse height information. The resolution can be slightly improved by ∼ 10 μrad when correcting for the bias due to discrete readout strips. The CMS upgrade design calls for readout electronics with binary hit output. When strip clusters are formed correspondingly without charge-weighting and with fixed hit thresholds, a position resolution of [136.8 ± 2.5 stat] μrad is measured, consistent with the expected resolution of strip-pitch/equation μrad. Other η-sectors of the detector show similar response and performance.

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M3 - Conference contribution

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BT - 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2014

PB - Institute of Electrical and Electronics Engineers Inc.

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