Speaker
Jeremie Alexandre Merlin
(Institut de Physique et Chimie des Materiaux de Strasbourg (FR))
Description
The CMS GEM collaboration is developing Gas Electron Multiplier (GEM) detectors for use in the endcap muon detector of the CMS experiment. The GEM detectors can operate well in the environment expected at the high-luminosity LHC. To insure long-term operation of the detectors, we test for gain drop, gain non-uniformity, dark current increase, discharge rate increase, and resolution loss after chamber aging. We continuously monitor the response of a detector irradiated by a Cs 137 source using the Gamma Irradiation Facility (GIF) at CERN. The detector we test was constructed using the new "NS2" method for stretching a GEM foil, and was built with carefully chosen materials and components. Outgassing tests are performed to validate the use of these components. Important parameters are monitored during the testing to identify the causes and effects of possible aging. Based on the results, we establish assembly methods and operational parameters to insure good performance at high luminosity