Time Resolution of the TOFHIR Chip for CMS HL-LHC Upgrade*

The Barrel Timing Layer (BTL) of the MIP timing detector for the CMS HL-LHC upgrade is a cylindrical detector designed to detect MIPs with a time resolution of 30 ps and a luminosity-weighted time resolution of 40-70 ps. The BTL will be read out by an ASIC, the TOFHIR chip, which collects data from 32 silicon photomultipliers. The true timing resolution of the TOFHIR chip has been measured previously at several over voltages and MIP energies by peer institutions. I will present my project that provides additional benchmarking and tests as well as expected true time resolutions and luminosity-weighted resolutions over a larger parameter space including a new variable of threshold voltage using an ultraviolet laser setup to mimic MIPs.