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Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 18: Instrumentation und Anwendungen II

HK 18.5: Talk

Tuesday, March 18, 2003, 16:30–16:45, C

Triple GEM Tracking Detectors for COMPASS - News from the 2002 Run — •Quirin Weitzel1, Jan Ehlers2, Jan Friedrich1, Boris Grube1, Steffen Kappler3,4, Bernhard Ketzer3,1, Igor Konorov1, Stephan Paul1, Alfredo Placci3, Leszek Ropelewski3, Fabio Sauli3, and Lars Schmitt11Technische Universität München, 85748 Garching — 2Universität Heidelberg, 69117 Heidelberg — 3CERN, 1211 Geneva 23, Switzerland — 4Universität Karlsruhe, 76128 Karlsruhe

The small-area tracker of COMPASS, a high-luminosity fixed target experiment at CERN’s SPS, includes a set of 20 large-size (31 × 31 cm 2 ) Gas Electron Multiplier (GEM) detectors. The principles and design of these detectors will be briefly reviewed emphasizing the main features adopted to allow operation in a high-flux environment. For the 2002 high-intensity muon-beam run of COMPASS the complete set of 20 GEM detectors was installed and succesfully commissioned. During three months of data taking all detectors operated stabily at normal working conditions. We will report on their performance during this run, with special emphasis on efficiencies, spatial resolutions and long-term operation. Some information on fast readout electronics including zero suppression, custom-made for the GEM and Silicon detectors, will also be given.
Supported by BMBF.

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