Speaker
Description
The High Luminosity LHC (HL-LHC) phase, scheduled to start in 2030 and deliver 3000 fb-1 in 10 years, will offer unique potential for precision measurements and searches for rare processes. However, it will also pose significant challenges for the detectors due to extremely high radiation levels and the large number of simultaneous interactions per bunch crossing (up to 200). To mitigate the adverse effects of pile-up, the CMS experiment will install a new detector, the MIP Timing Detector (MTD), designed to measure the arrival time of charged particles with a precision of 30-60 ps. The central part of the MTD, the Barrel Timing Layer (BTL), is made of about 166,000 scintillating LYSO:Ce crystal bars with double-ended SiPM readout. Following its design optimisation and successful performance validation through dedicated test beam campaigns on prototypes, the BTL is now in the construction phase. This contribution will give an overview of the key design features of the BTL and will present recent large-scale system tests and the progress on the BTL assembly.
