Speaker
Description
The High Luminosity phase of the Large Hadron Collider (HL-LHC), with an integrated luminosity of approximately 3000 fb⁻¹ over ten years, will enable experiments to search for rare processes and perform precision measurements. However, it will also present significant challenges for the detectors, due to high pile-up, up to 200 interactions per bunch crossing, and extremely high radiation levels. To mitigate the adverse effects of pile-up, the CMS detector will install a novel detector, the MIPs Timing Detector (MTD), designed to precisely measure the arrival time of charged particles, allowing for the separation of particles from different interactions in the same bunch crossing. The barrel section of the MTD, the Barrel Timing Layer (BTL), consists of approximately 166,000 scintillating LYSO:Ce crystals coupled to custom SiPMs. It will measure the MIP timing with a precision of around 30 ps at the start of operations, degrading to about 60 ps towards the end of its lifetime due to radiation damage to the SiPMs. After optimization and validation of the BTL performance through dedicated test beam campaigns on prototypes, BTL is now in the construction phase. In this contribution the key features of the BTL, the validation of its performance, and the current status of its assembly and qualification will be presented.
