Characterization of a Triple-GEM Detector Prototype for the CMS Muon Spectrometer Upgrade with GEM Detectors

The triple-GEM detectors are a candidate technology to instrument the forward region of the CMS muon spectrometer, during the upgrade of LHC scheduled to achieve high luminosity (2 ×1034 cm−2 s −1 ). These detectors show a very high resistance under the high particles uxes expected in that region. In this work I tested a small triple-GEM prototype (10 × 10 cm2 ) in order to measure gain and efficiency, using photons generated by an F e55 source and cosmic muons. The measurements have been performed using a completely new set-up still in development at the ULB particle physics department.