Speaker
Description
The LHCb experiment is planning a major detector upgrade for the LHC RUN5 (2035) to cope with the foreseen instantaneous peak luminosity of ∼ 1.0 − 1.5 × 1034 cm$^{−2}$s$^{−1}$. For the RICH Upgrade-II detectors, new photo-sensors are under study since the present MaPMTs cannot stand the high particle flux in the central high occupancy region in a very harsh environment.
Silicon Photo Multiplier (SiPM) is the candidate technology, given the fast time response, small dimensions and high photo-detection efficiency. Their main drawback is the radiation damage which provokes a massive DCR increase and could require mitigation strategies, namely neutron shielding, in-situ annealing, cooling to low temperatures and replacing periodically the devices.
An extensive irradiation campaign is ongoing to measure the variation of their performances with increasing 1MeV equivalent neutron fluences, up to the maximum expected value of few × 10$^{13}$n/cm$^2$.
Results of I-V curves, Gain, DCR and Time Resolution, as a function of the over-voltage, temperature and for few irradiation steps, will be presented.
