Quality control for the first large areas of triple-GEM chambers for the CMS endcaps

¹ RWTH Aachen University, III Physikalisches Institut A, Aachen, Germany
² INFN Bari and University of Bari, Bari, Italy
³ Peking University, Beijing, China
⁴ INFN Bologna and University of Bologna, Bologna, Italy
⁵ Universite Libre de Bruxelles, Brussels, Belgium
⁶ National Institute of Science Education and Research, Bhubaneswar
⁷ Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
⁸ Academy of Scientific Research and Technology - Egyptian Network of High Energy Physics, ASRT-ENHEP, Cairo, Egypt
⁹ Texas A&M University, College Station, U.S.A.
¹⁰ Institute for Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Debrecen, Hungary
¹¹ University of Delhi, Delhi, India
¹² Wayne State University, Detroit, U.S.A
¹³ Texas A&M University at Qatar, Doha, Qatar
¹⁴ Laboratori Nazionali di Frascati - INFN, Frascati, Italy
¹⁵ University of Florida, Gainesville, U.S.A.
¹⁶ Petersburg Nuclear Physics Institute, Gatchina, Russia
¹⁷ CERN, Geneva, Switzerland
¹⁸ Ghent University, Dept. of Physics and Astronomy, Ghent, Belgium
¹⁹ National Center for Physics, Quaid-i-Azam University Campus, Islamabad, Pakistan
²⁰ Saha Institute of Nuclear Physics, Kolkata, India
²¹ Lappeenranta University of Technology, Lappeenranta, Finland
²² University of California, Los Angeles, U.S.A.
²³ Florida Institute of Technology, Melbourne, U.S.A.
²⁴ Bhabha Atomic Research Centre, Mumbai, India
²⁵ INFN Napoli, Napoli, Italy
²⁶ INFN Pavia and University of Pavia, Pavia, Italy
²⁷ IRFU CEA-Saclay, Saclay, France
²⁸ Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
²⁹ Sofia University, Sofia, Bulgaria
³⁰ Korea University, Seoul, Korea
³¹ Seoul National University, Seoul, Korea
³² University of Seoul, Seoul, Korea
³³ Institut Pluridisciplinaire - Hubert Curien (IPHC), Strasbourg, France

^a Corresponding author; e-mail: Michael.Tytgat@UGent.be

Published online: 21 February 2018

Abstract

The CMS Collaboration plans to equip the very forward muon system with triple-GEM detectors that can withstand the environment of the High-Luminosity LHC. This project is at the final stages of R&D and moving to production. An unprecedented large area of several 100 m² are to be instrumented with GEM detectors which will be produced in six different sites around the world. A common construction and quality control procedure is required to ensure the performance of each detector. The quality control steps will include optical inspection, cleaning and baking of all materials and parts used to build the detector, leakage current tests of the GEM foils, high voltage tests, gas leak tests of the chambers and monitoring pressure drop vs. time, gain calibration to know the optimal operation region of the detector, gain uniformity tests, and studying the efficiency, noise and tracking performance of the detectors in a cosmic stand using scintillators.