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T: Fachverband Teilchenphysik

T 19: Myondetektoren

T 19.4: Vortrag

Montag, 25. März 2019, 16:50–17:05, ST 3

Validation of the CMS GEM Chambers with cosmic rays — •Giovanni Mocellin, Thomas Hebbeker, Kerstin Hoepfner, Henning Keller, Carsten Heidemann, and Moritz Seidel — III. Physikalisches Institut A, RWTH Aachen University

With the increase of the instantaneous luminosity delivered to the experiments by the LHC accelerator, reaching a value of 5×10³⁴ cm⁻²s⁻¹ after the Long Shutdown 3, the detectors have to be upgraded to improve the performance and to sustain higher particle fluxes. The forward regions, corresponding to the endcaps of the detectors, are the most affected parts. 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 Muon Endcaps. For the first time, such detectors will have large sizes of the order of 1 m², thus high requirements on the consistency of the performance across the detector are needed. Triple-GEM chambers will complement the existing Cathode Strip Chambers, leading to a better identification of the muon tracks and a reduction of the trigger rate due to the suppression of fake candidates. In addition, the forward coverage will be further extended. Before the final installation in the CMS detector, the GEM chambers undergo a quality control test with cosmic rays to check their integrity, quality and performance. The main parameters under study are the efficiency, the noise level and the tracking capabilities. This talk gives an introduction to GEM detectors and presents the status and the initial results of the cosmic rays test.