Caratterizzazione delle Ultime Produzioni di Ultra-Fast Silicon Detectors per il MIP Timing Detector dell'Esperimento CMS

In the next years, the Compact Muon Solenoid (CMS) detector at CERN will undergo a series of upgrades to cope with the much harsher conditions of the High-Luminosity Large Hadron Collider (HL-LHC). One of the main upgrades will be the introduction of the MIP Timing Detector (MTD), able to measure the time of minimum ionizing particles precisely. The Endcap Timing Layer (ETL) of the MTD will be instrumented with Low Gain Avalanche Diodes. This novel sensor technology achieves excellent time resolutions (about 30 ps) thanks to an internal gain mechanism. Torino is leading the sensor R&D, intending to define the sensor design characteristics suitable for the ETL detector. The CMS collaboration is currently concluding the R&D and prototyping phase, so the final sensor design will have to be chosen within a year. This thesis aims to study some key features of the latest sensor productions using ad hoc test methodologies.This work directly contributes to the technological choices that will define the LGAD sensors of the CMS ETL detector.