Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 90: Muon detectors

T 90.4: Vortrag

Donnerstag, 18. März 2021, 16:50–17:05, To

The CMS Muon upgrade and the impact of GEM etching techniques on detector performance — •Francesco Ivone, Thomas Hebbeker, Kerstin Hoepfner, Henning Keller, Giovanni Mocellin, and Shawn Zaleski — III. Physikalisches Institut A, RWTH Aachen University

The LHC will undergo a major upgrade to deliver ten times more pp-collisions in the next two decades, which has been named High-Luminosity LHC (HL-LHC). To cope with the higher event rates and with the increased radiation doses, the Compact Muon Solenoid (CMS) experiment will undergo several upgrades including the installation of an additional set of muon detectors based on the Gas Electron Multipliers (GEM) technology. Triple-GEM detectors have already been installed in the CMS endcap stations named GE1/1 during Long Shutdown 2, while two more stations, GE2/1 and GE0, will adopt the same technology during subsequent shutdowns. The GEM foils, the core of GEM-based detectors, are currently produced with either double-mask or single-mask etching. Despite being an effective method, GEM hole asymmetry is observed in single mask compared to double mask. The effect of the hole asymmetry on the detector performance has been studied with a twofold approach. On one hand experimental data have been collected using GEM foils with different hole geometries, on the other hand detailed simulations have been performed matching the experimental set-up conditions. This talk gives an introduction to GEM detectors in CMS and describes a study to assess the impact of the GEM hole asymmetry on the detector performance.