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Radiation tests of real-sized prototype RPCs for the phase-2 upgrade of the CMS Muon System

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Abstract
We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for the Phase-2 upgrade of the CMS muon system at high eta. In the present study, we constructed real-sized double-gap and four-gap RPCs with gap thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic high-pressure-laminated (HPL) plates. We examined the prototype RPCs with cosmic rays and with 100-GeV muons provided by the SPS H4 beam line at CERN. To examine the rate capability of the prototype RPCs both at Korea University and at the CERN GIF++ facility, the chambers were irradiated with Cs-137 sources providing maximum gamma rates of about 1.5 kHz cm(-2). For the 1.6-mm-thick double-gap RPCs, we found the relatively high threshold on the produced detector charge was conducive to effectively suppressing the rapid increase of strip cluster sizes of muon hits with high voltage, especially when measuring the narrow-pitch strips. The gamma-induced currents drawn in the four-gap RPC were about one-fourth of those drawn in the double-gap RPC. The rate capabilities of both RPC types, proven through the present testing using gamma-ray sources, far exceeded the maximum rate expected in the new high-eta endcap RPCs planned for future phase-II runs of the Large Hadron Collider (LHC).
Keywords
Resistive-plate chambers, Gaseous detectors, Trigger detectors

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Chicago
Lee, KS, SW Cho, SY Choi, B Hong, Y Go, MH Kang, JH Lim, et al. 2016. “Radiation Tests of Real-sized Prototype RPCs for the Phase-2 Upgrade of the CMS Muon System.” Journal of Instrumentation 11 (8).
APA
Lee, KS, Cho, S., Choi, S., Hong, B., Go, Y., Kang, M., Lim, J., et al. (2016). Radiation tests of real-sized prototype RPCs for the phase-2 upgrade of the CMS Muon System. JOURNAL OF INSTRUMENTATION, 11(8). Presented at the 13th Workshop on Resistive Plate Chambers and Related Detectors.
Vancouver
1.
Lee K, Cho S, Choi S, Hong B, Go Y, Kang M, et al. Radiation tests of real-sized prototype RPCs for the phase-2 upgrade of the CMS Muon System. JOURNAL OF INSTRUMENTATION. 2016;11(8).
MLA
Lee, KS, SW Cho, SY Choi, et al. “Radiation Tests of Real-sized Prototype RPCs for the Phase-2 Upgrade of the CMS Muon System.” JOURNAL OF INSTRUMENTATION 11.8 (2016): n. pag. Print.
@article{8523442,
  abstract     = {We report on a systematic study of double-gap and four-gap phenolic resistive plate chambers (RPCs) for the Phase-2 upgrade of the CMS muon system at high eta. In the present study, we constructed real-sized double-gap and four-gap RPCs with gap thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic high-pressure-laminated (HPL) plates. We examined the prototype RPCs with cosmic rays and with 100-GeV muons provided by the SPS H4 beam line at CERN. To examine the rate capability of the prototype RPCs both at Korea University and at the CERN GIF++ facility, the chambers were irradiated with Cs-137 sources providing maximum gamma rates of about 1.5 kHz cm(-2). For the 1.6-mm-thick double-gap RPCs, we found the relatively high threshold on the produced detector charge was conducive to effectively suppressing the rapid increase of strip cluster sizes of muon hits with high voltage, especially when measuring the narrow-pitch strips. The gamma-induced currents drawn in the four-gap RPC were about one-fourth of those drawn in the double-gap RPC. The rate capabilities of both RPC types, proven through the present testing using gamma-ray sources, far exceeded the maximum rate expected in the new high-eta endcap RPCs planned for future phase-II runs of the Large Hadron Collider (LHC).},
  articleno    = {C08008},
  author       = {Lee, KS and Cho, SW and Choi, SY and Hong, B and Go, Y and Kang, MH and Lim, JH and Park, SK and Cimmino, Anna and Crucy, Shannon Rebecca and Fagot, Alexis and Gul, Muhammad and Ocampo Rios, Alberto Andres and Tytgat, Michael and Zaganidis, Nikolaos and Aly, S and Assran, Y and Radi, A and Sayed, A and Singh, G and Abbrescia, M and Iaselli, G and Maggi, M and Pugliese, G and Verwilligen, P and vanDoninck, W and Colafranceschi, S and Sharma, A and Benussi, L and Bianco, S and Piccolo, D and Primavera, F and Bhatnagar, V and Kumarl, R and Metha, A and Singh, J and Ahmad, A and Ahmad, M and Ahmed, W and Asghar, MI and Awan, IM and Hassan, Q and Hoorani, H and Khan, WA and Khurshid, T and Muhammad, S and Shah, MA and Shahzad, H and Kim, MS and Goutzvitz, M and Grenier, G and Lagarde, F and Laktineh, IB and Carpinteyro Bernardino, S and Uribe Estrada, C and Pedraza, I and Severiano, CB and Carrillo Moreno, S. and Vazquez Valencia, F and Pant, LM and Buontempo, S and Cavallo, N and Esposito, M and Fabozzi, F and Lanza, G and Lista, L and Meola, S and Merola, M and Orso, I and Paolucci, P and Thyssen, F and Braghieri, A and Magnani, A and Montagna, P and Riccardi, C and Salvini, P and Vai, I and Vitulo, P and Ban, Y and Qian, SJ and Choi, M and Choi, Y and Goh, J and Kim, D and Aleksandrov, A and Hadjiiska, R and Iaydjiev, P and Rodozov, M and Stoykova, S and Sultanov, G and Vutova, M and Dimitrov, A and Litov, L and Pavlov, B and Petkov, P and Lomidze, D and Avila, C and Cabrera, A and Sanabria, JC and Crotty, I and Vaitkus, J},
  issn         = {1748-0221},
  journal      = {JOURNAL OF INSTRUMENTATION},
  language     = {eng},
  location     = {Ghent, Belgium},
  number       = {8},
  pages        = {12},
  title        = {Radiation tests of real-sized prototype RPCs for the phase-2 upgrade of the CMS Muon System},
  url          = {http://dx.doi.org/10.1088/1748-0221/11/08/c08008},
  volume       = {11},
  year         = {2016},
}

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