The Run 3 timing detector of the CMS Precision Proton Spectrometer: Status and performance

The CMS Precision Proton Spectrometer at the LHC measures protons scattered in the very forward region. Single crystal diamond detectors are used to precisely measure the proton time-of-flights and to reconstruct the longitudinal position of the interaction vertex. For the LHC Run 3 the timing detector was upgraded with the aim to reach a timing resolution of better than 30 ps, corresponding to a vertex resolution of better than 1 cm. An overview of the timing detector upgrade is given and the diamond detector testing procedure before installation is described. Preliminary results of the Run 3 timing detector performance are reported.