PoS - Proceedings of Science
Volume 448 - The 32nd International Workshop on Vertex Detectors (VERTEX2023) - Operational experience on current detectors
Operation and performance of the current CMS Pixel Detector
G. Haza
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Pre-published on: February 17, 2024
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The CMS pixel tracker provided high-quality physics data during the LHC Run 2, finishing with a detector live fraction of 95\% and hit efficiency of >99\% in all but the innermost layer. However, issues encountered during Run 2 - in particular direct current to direct current (DCDC) converter failures during power cycles to reset stuck token bit managers (TBM) - necessitated a thorough refurbishment of the detector during Long Shutdown 2. The innermost layer of the barrel section was replaced, incorporating new versions of the PROC600 readout chip, TBM, and high density interconnect. New FEAST 2.3 DCDC converters were installed in the full detector, and damaged modules were replaced where accessible. The refurbished pixel detector was reinstalled in CMS in June 2021. A period of thorough commissioning followed, including the acquisition of 3.5\,M cosmics tracks for alignment. This talk will summarize the refurbishment and commissioning of the pixel detector, as well as recent performance results from Run 3 operation.
DOI: https://doi.org/10.22323/1.448.0004
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