Author/Authors :
Ageron، نويسنده , , M. and Albert، نويسنده , , A. and Barvich، نويسنده , , T. and Beaumont، نويسنده , , W. and Beckers، نويسنده , , T. and Bernier، نويسنده , , K. and Blüm، نويسنده , , P. and Bouhali، نويسنده , , O. and Boulogne، نويسنده , , I. and Bouvet، نويسنده , , D. and Brom، نويسنده , , J.M and Charles، نويسنده , , F. and Coffin، نويسنده , , J. and Contardo، نويسنده , , D. and Daubie، نويسنده , , E. and Didierjean، نويسنده , , F. and Er، نويسنده ,
Abstract :
A system of detector modules consisting of a large size Gas Electron Multiplier (GEM), coupled to Micro Strip Gas Counters (MSGC), has been exposed to a pion beam at the Paul Scherrer Institute Cyclotron facility. As part of a CMS tracker milestone, the aim of this test was to investigate the robustness of such detectors when exposed to experimental conditions close to what is expected at the Large Hadron Collider (LHC) of CERN. Eighteen detector modules have been operated at voltage settings corresponding to 98% detection efficiency for Minimum Ionizing Particles during a period of 5 weeks. Sparking rates and strip losses have been monitored throughout the exposure. An operation margin of at least a factor of three with respect to the required gas gain has been demonstrated.
