Heidelberg 2022 – scientific programme

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T: Fachverband Teilchenphysik

T 67: Myon Detectors

T 67.9: Talk

Wednesday, March 23, 2022, 18:25–18:40, T-H26

The CMS Muon upgrade and the commissioning of the first GEM station — •Francesco Ivone, Thomas Hebbeker, Kerstin Hoepfner, Giovanni Mocellin, and Shawn Zaleski — III. Physikalisches Institut A, RWTH Aachen University

The LHC will undergo a major upgrade to deliver ~10 times more proton-proton collisions in the next two decades, which has been named High-Luminosity LHC (HL-LHC). To cope with the higher event rates and to improve the trigger capabilities in the forward region, the Compact Muon Solenoid (CMS) experiment will undergo several upgrades. These include the installation of an additional set of muon detectors based on the Gas Electron Multipliers (GEM) technology. The triple-GEM detectors named GE1/1 have already been installed during 2020. Two more stations, GE2/1 and GE0, will adopt the same technology during subsequent shutdowns. The GE1/1 system consists of 72 chambers made by two layers of Triple-GEM detectors, this will improve the muon triggering and tracking capabilities of CMS.

We report on the commissioning of the GE1/1 detectors, focusing on the performance measured during the first CMS commissioning runs which include cosmic-ray muons and collision events. We discuss on the strategy implemented to identify the optimum working point and the system performance stability.