PoS - Proceedings of Science
Volume 390 - 40th International Conference on High Energy physics (ICHEP2020) - Parallel: Detectors for Future Facilities (incl. HL-LHC), R&D, Novel Techniques
Upgrade of the CMS Cathode Strip Chambers for the HL-LHC
S. Dildick* on behalf of the CMS collaboration
*corresponding author
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Pre-published on: February 11, 2021
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The Large Hadron Collider will be upgraded in several phases to significantly expand its physics program, and these upgrades present major challenges to the operations of the Compact Muon Solenoid cathode-strip-chamber muon system. After the current Long Shutdown (LS2) from 2019-2021 the accelerator luminosity will be increased to $2-3 \times 10^{34} ~\mathrm{cm}^{-2} ~\mathrm{s}^{-1}$, exceeding the design value of $10^{34}~\mathrm{cm}^{-2} ~\mathrm{s}^{-1}$ and allowing the CMS experiment to collect an integrated luminosity of approximately $100 ~\mathrm{fb}^{-1}$/year. A subsequent upgrade in 2024-2027 will increase the luminosity up to $5-7.5 \times 10^{34}~\mathrm{cm}^{-2} ~\mathrm{s}^{-1}$. The CMS Muon system must be able to sustain a physics program after the LS2 shutdown that maintains sensitivity to electroweak scale physics and for TeV-scale searches. The CSC upgrade program is designed to address key challenges associated with operations at high luminosity. The electronics will be upgraded to handle the expected higher data rates. The design of the upgraded CSC electronics will be discussed, as well as the status of the first phase of the electronics installation. In addition, accelerated irradiation tests are being performed to study the behavior of the CSC electronics under conditions, which are nearly an order of magnitude beyond the original design values. Studies have also been performed of chamber gas mixtures to reduce greenhouse-gas impacts. The status of this irradiation campaign and results will be presented.
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