Volume 476 - 42nd International Conference on High Energy Physics (ICHEP2024) - Operation, Performance and Upgrade (incl. HL-LHC) of Present Detectors Posters
Quality control of LYSO:Ce crystals for the CMS barrel MIP Timing Detector
P. Akrap*  on behalf of the CMS Collaboration
*: corresponding author
Full text: pdf
Pre-published on: December 17, 2024
Published on: April 29, 2025
Abstract
The MIP Timing Detector (MTD) is a new sub-detector planned for the Phase 2 upgrade of the CMS
experiment at the CERN LHC, designed to measure the time-of-arrival of charged particles with a
resolution of 30-60 ps. The barrel region of MTD (Barrel Timing Layer, BTL) is made of arrays
of Cerium-doped Lutetium-Yttrium Oxyorthosilicate (LYSO Ce) scintillating bars, readout by silicon
photo-multipliers arrays. The quality of BTL LYSO crystals in the production phase is being monitored in a dedicated laboratory in INFN-Rome1, for a sample of arrays and single crystals. In order to
ensure mechanical compatibility in the detector assembly, arrays undergo dimensional measurements.
Performances of LYSO arrays and single crystals are checked by measuring light output, decay time,
optical cross-talk, time resolution, and transmittance. Radiation hardness of the samples against ionizing radiation by gamma rays are studied at the Calliope facility of ENEA-Casaccia Research Centre.
DOI: https://doi.org/10.22323/1.476.0950
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