PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T12 Detector R&D and Data Handling
The upgrade of the CMS muon system for the High Luminosity LHC
M.B. Kiani*  on behalf of the CMS Collaboration
Full text: pdf
Pre-published on: January 19, 2024
Published on: March 21, 2024
To accommodate the anticipated five-fold increase in instantaneous luminosity during the High Luminosity phase of the Large Hadron Collider (HL-LHC), the CMS experiment's muon spectrometer will undergo comprehensive upgrades to its electronics and detectors. These enhancements aim to maintain the system's exceptional performance amidst the more demanding data-taking conditions of the HL-LHC. The current CMS muon system employs a combination of detector technologies, each optimized for specific regions. Drift Tubes (DT) and Resistive Plate Chambers (RPC) are deployed in the barrel, while the endcap utilize cathode strip chambers (CSC) and RPC. The electronics upgrade will focus on the existing DT, CSC, and RPC systems. The CSC electronics upgrade was largely completed during Long Shutdown 2 (LS2), while the DT electronics upgrade is scheduled for LS3. Prototypes of the new On-Board electronics for DT (OBDT) are currently undergoing testing and validation in CMS slice-test demonstrators. To address the anticipated higher background rates in the endcap, new detector stations will be installed. These stations will utilize triple gas electron multiplier (GEM) and improved resistive plate chambers (iRPC) technologies, offering enhanced time and spatial resolution and improved rate capability. The GE1/1 station, based on GEM technology, was installed in the endcap region during LS2, covering the pseudorapidity range 1.55 < |$\eta$| < 2.18. Two additional GEM stations, GE2/1 and ME0, are planned for future installation to further enhance muon reconstruction in the endcap and extend the muon system's coverage up to |$\eta$| 2.8. This presentation will provide an overview of the Muon Spectrometer upgrades, detailing the electronics developments for the DT and CSC systems. It will also present an overview of the new triple-GEM (GE2/1, ME0) and iRPC (RE3/1, RE4/1) detector stations that will be installed before Long Shutdown 3.
DOI: https://doi.org/10.22323/1.449.0518
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