Performance studies of large-area triple-GEM prototypes for future upgrades of the CMS forward muon system

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Abstract
The RPC muon system of the CMS detector at the CERN LHC remains uninstrumented in the pseudorapidity region 1.6<|η|<2.4. An ongoing project aims at covering the region of the muon endcaps with large-area triple-GEM detectors whose features are suited to enhance muon tracking and preserve triggering capabilities for the CMS detector upgrade. The design and assembling of small (10 cm × 10 cm) and full-size trapezoidal (1 m × 0.5 m) triple-GEM prototypes will be described. The prototypes have been tested with soft x-rays and with a pion/muon test beam at the CERN SPS. Results from measurements with different experimental setup on detector resolution and efficiency as well as timing performance will be reported. Preliminary simulation results will be discussed, related to studies on performance variations of the expected muon tracks reconstruction and trigger performance for different upgraded muon system scenarios.

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