Impact of magnetic field on the stability of the CMS GE1/1 GEM detector operation

Abbas, M.; Abbott, S.; Abbrescia, M.; Abdalla, H.; Abdelalim, A.; Abuzeid, S.; Aebi, D.; Agapitos, A.; Ahmad, A.; Ahmed, A.; Ahmed, W.; Aimè, C.; Akhter, T.; Alsufyani, B.; Aruta, C.; Asghar, I.; Aspell, P.; Avila, C.; Babbar, J.; Ban, Y.; Band, R.; Bansal, S.; Benussi, L.; Bhatnagar, V.; Bianco, M.; Bianco, S.; Black, K.; Borgonovi, L.; Bouhali, O.; Braghieri, A.; Braibant, S.; Butalla, S.; Cagnotta, A.; Calzaferri, S.; Campagnola, R.; Caponero, M.; Carlson, J.; Cassese, F.; Cavallo, N.; Chauhan, S. S.; Choudhary, B.; Colafranceschi, S.; Colaleo, A.; Conde Garcia, A.; Datta, A.; De Iorio, A.; De Lentdecker, G.; Dell Olio, D.; De Robertis, G.; Dharmaratna, W.; Elkafrawy, T.; Erbacher, R.; Everaerts, P.; Fabozzi, F.; Fallavollita, F.; Fiorina, D.; Franco, M.; Galloni, C.; Giacomelli, P.; Gigli, S.; Gilmore, J.; Gola, M.; Gutierrez, A.; Hadjiiska, R.; Hoepfner, K.; Hohlmann, M.; Hong, Y.; Hoorani, H.; Huang, T.; Iaydjiev, P.; Irshad, A.; Iorio, A.; Ivone, F.; Jang, W.; Jaramillo, J.; Jeong, Y.; Juska, E.; Kailasapathy, B.; Kamon, T.; Kang, Y.; Karchin, P.; Kaur, A.; Kaur, H.; Keller, H.; Kim, H.; Kim, J.; Kim, M.; Kim, S.; Ko, B.; Kumar, A.; Kumar, S.; Lacalamita, N.; Lee, J. S. H.; Levin, A.; Li, Q.; Licciulli, F.; Lista, L.; Liyanage, K.; Loddo, F.; Luhach, M.; Maggi, M.; Maghrbi, Y.; Majumdar, N.; Malagalage, K.; Martiradonna, S.; Merlin, J.; Misheva, M.; Mocellin, G.; Moureaux, L.; Muhammad, A.; Muhammad, S.; Mukhopadhyay, S.; Naimuddin, M.; Nuzzo, S.; Oliveira, R.; Paolucci, P.; Park, I. C.; Passamonti, L.; Passeggio, G.; Peck, A.; Pellecchia, A.; Perera, N.; Petre, L.; Piccolo, D.; Pierluigi, D.; Radogna, R.; Raffone, G.; Ramirez, F.; Ranieri, A.; Rashevski, G.; Rathjens, D.; Regnery, B.; Rendon, C.; Riccardi, C.; Rossi, B.; Rout, P.; Ruiz, J. D.; Russo, A.; Safonov, A.; Sahota, A. K.; Saltzberg, D.; Saviano, G.; Shah, A.; Sharma, A.; Sharma, R.; Sheokand, T.; Shopova, M.; Simone, F.; Singh, J.; Sonnadara, U.; Sturdy, J.; Sultanov, G.; Szillasi, Z.; Teague, D.; Teyssier, D.; Tytgat, M.; Vai, I.; Vanegas, N.; Venditti, R.; Verwilligen, P.; Vetens, W.; Virdi, A. K.; Vitulo, P.; Wajid, A.; Wang, D.; Wang, K.; Watson, I. J.; Wickramage, N.; Wickramarathna, D. D. C.; Yanes, E.; Yang, S.; Yang, U.; Yang, Y.; Yoon, I.; You, Z.; Yu, I.; Zaleski, S.

doi:10.1088/1748-0221/18/11/P11029

The Gas Electron Multiplier (GEM) detectors of the GE1/1 station of the CMS experiment have been operated in the CMS magnetic field for the first time on the 7th of October 2021. During the magnetic field ramps, several discharge phenomena were observed, leading to instability in the GEM High Voltage (HV) power system. In order to reproduce the behavior, it was decided to conduct a dedicated test at the CERN North Area with the Goliath magnet, using four GE1/1 spare chambers. The test consisted in studying the characteristics of discharge events that occurred in different detector configurations and external conditions. Multiple magnetic field ramps were performed in sequence: patterns in the evolution of the discharge rates were observed with these data. The goal of this test is the understanding of the experimental conditions inducing discharges and short circuits in a GEM foil. The International School for Advanced Studies (SISSA) logo. paper • The following article is Open access Impact of magnetic field on the stability of the CMS GE1/1 GEM detector operation M. Abbas14, S. Abbott34, M. Abbrescia19, H. Abdalla9,11, A. Abdelalim9,12, S. AbuZeid10,23, D. Aebi33, A. Agapitos5, A. Ahmad29, A. Ahmed17Show full author list Published 29 November 2023 • © 2023 The Author(s) Journal of Instrumentation, Volume 18, November 2023 Citation M. Abbas et al 2023 JINST 18 P11029 DOI 10.1088/1748-0221/18/11/P11029 Download Article PDF Publish open access in this journal at no cost See if your institution is participating in the transformative agreement with Italian institutions in the CRUI consortium. References Download PDF Article metrics 51 Total downloads MathJax Turn on MathJax Share this article Share this content via email Share on Facebook (opens new window) Share on Twitter (opens new window) Share on Mendeley (opens new window) Article and author information Abstract The Gas Electron Multiplier (GEM) detectors of the GE1/1 station of the CMS experiment have been operated in the CMS magnetic field for the first time on the 7th of October 2021. During the magnetic field ramps, several discharge phenomena were observed, leading to instability in the GEM High Voltage (HV) power system. In order to reproduce the behavior, it was decided to conduct a dedicated test at the CERN North Area with the Goliath magnet, using four GE1/1 spare chambers. The test consisted in studying the characteristics of discharge events that occurred in different detector configurations and external conditions. Multiple magnetic field ramps were performed in sequence: patterns in the evolution of the discharge rates were observed with these data. The goal of this test is the understanding of the experimental conditions inducing discharges and short circuits in a GEM foil. The results of this test lead to the development of procedure for the optimal operation and performance of GEM detectors in the CMS experiment during the magnet ramps. Another important result is the estimation of the probability of short circuit generation, at 68 % confidence level, pshortHV OFF = 0.42-0.35+0.94% with detector HV OFF and pshortHV OFF < 0.49% with the HV ON. These numbers are specific for the detectors used during this test, but they provide a first quantitative indication on the phenomenon, and a point of comparison for future studies adopting the same procedure.