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T: Fachverband Teilchenphysik
T 105: Muon detectors
T 105.2: Vortrag
Freitag, 3. April 2020, 11:20–11:35, L-3.016
Triple GEM detectors for the CMS Muon Upgrade — •Giovanni Mocellin, Thomas Hebbeker, Kerstin Hoepfner, Henning Keller, and Shawn Zaleski — III. Physikalisches Institut A, RWTH Aachen University
With the increase of the instantaneous luminosity delivered to the experiments during Phase-2 of the LHC planned to start after the Long Shutdown 3, the detectors have to be upgraded to improve the performance and to sustain higher particle fluxes. The detectors in the forward regions are the most affected. In the CMS experiment, to cope with the higher event rates and larger radiation doses, triple-layer Gas Electron Multipliers (GEM) will be installed in the endcaps to complement the existing Cathode Strip Chambers and further extend the coverage. For the first time, such detectors will have large sizes of the order of 1 m2, thus high requirements on the uniformity across the detector are needed. Chambers are built in production sites spread over 7 countries around the world. To test their integrity, quality and performance, the GEM chambers undergo multiple quality control tests at the sites. After shipment to CERN, a final major test with cosmic rays is performed before installation. The first endcap has been equipped with 144 detectors and is being integrated in CMS. This talk gives an introduction to GEM detectors in CMS, presents their performance in quality control tests, status of installation and initial results during operations in CMS.