Speaker
Description
The High-Luminosity LHC (HL-LHC) will deliver proton–proton collisions at 5 to 7.5 times the nominal LHC luminosity, resulting in an average of 140 to 200 interactions per bunch crossing. To preserve efficient muon triggering and reconstruction in this high-background environment, the forward region of the CMS muon system will be upgraded with Gas Electron Multiplier (GEM) detectors and improved Resistive Plate Chambers (iRPCs).
A new six-layer Triple-GEM detector station, ME0, covering an area of approximately 60 m², will extend the pseudorapidity coverage of the CMS muon system from |η| < 2.4 to |η| < 2.8. The ME0 station will be installed behind the High-Granularity Calorimeter (HGCAL) during the third Long Shutdown (LS3, 2026–2029).
The ME0 detectors will operate in an environment with background rates reaching up to 150 kHz/cm², which required several design optimizations. In this contribution, the design evolution of the final ME0 detectors is presented, together with lessons learned from extensive and continuous detector testing. The status of mass production is reported, along with performance measurements obtained using cosmic-ray data and test-beam campaigns. The latter were performed at the CERN GIF++ facility, where the high-rate conditions expected at the HL-LHC are realistically reproduced.
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