Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 19: Myondetektoren
T 19.3: Talk
Monday, March 25, 2019, 16:35–16:50, ST 3
Production and quality control of GEM chambers for the CMS Muon System — •Henning Keller, Thomas Hebbeker, Carsten Heidemann, Kerstin Hoepfner, Giovanni Mocellin, and Moritz Seidel — III. Physikalisches Institut A, RWTH Aachen University
In the next years, the LHC will experience a series of upgrades leading to an increased instantaneous luminosity of up to 5 × 1034 cm−2s−1. Along with the LHC, the CMS detector needs to be upgraded, where, in particular, the forward region will be subject to higher background rates and larger radiation doses.
The installation of GE1/1 detectors during Long Shutdown 2 marks the first major upgrade of the CMS Muon System. The endcaps will be complemented by 144 Gas Electron Multiplier (GEM) chambers representing a key component for the muon trigger and tracking performance at high luminosity.
Production sites in seven different countries around the world have been setup to assemble and test the required amount of detectors. GEM detectors with large dimensions of the order of 1 m2 are built. Before installation, several quality control tests (QCs) are performed. Individual components of the chamber, such as the GEM foils and the gaps between the foils as well as outer frames and PCBs are tested (QC1-2). QC3 and QC4 cover checks of gas tightness and high voltage integrity. QC5 is dedicated to measure the gas gain uniformity.
The mass production of the CMS GEM detectors and the outcome of the quality control tests are discussed in this talk.