Journal
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Volume 53, Issue 1, Pages 322-325Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TNS.2006.869834
Keywords
CF4; discharge; high-energy physics; gas electron multiplier (GEM); Large Hadron Collider (LHC); tracking; trigger; time-resolution
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A triple-gas electron multiplier (GEM) detector, operated with the gas mixture Ar/CO2/CF4 (45/15/40), is going to equip station M1, region RI of the LHCb muon system. A Module-0 of this detector, with full area (20 cm x 24 cm) GEM foils, was recently built and tested. In this paper, new measurements of efficiency and pad multiplicity are presented. These new measurements were very important to select of the final pad board configuration. The sensitivity to discharges is a very important issue in this type of detector; we discuss here new measurements of the maximum number of discharges that a triple-GEM detector can stand before breakdown, and we show that detector operation in LHCb is safe from this point of view. We also discuss new measurements of the time performance of the detector in the presence of background radiation, indicating that no significant deterioration of the performances is expected in the LHCb environment.
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