Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 62: Myondetektoren

T 62.5: Talk

Wednesday, March 21, 2018, 17:35–17:50, Z6 - SR 2.002

Quality control of GEM detectors for the Upgrade of the CMS Muon Forward system — •Giovanni Mocellin, Henning Keller, Kerstin Hoepfner, and Thomas Hebbeker — III. Physikalisches Institut A, RWTH Aachen University, Germany

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 in 2025, 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 1-2 m², thus high requirements on the uniformity 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, to test their integrity, quality and performance, the GEM chambers undergo eight Quality Control tests (QC1-QC8). One of the sites in which these operations are performed is Aachen. This talk gives an introduction to GEM detectors and presents results of the performance tests.