Production and tests of Hybrid Photon Detectors for the LHCb RICH detectors

The LHCb Ring Imaging Cherenkov (RICH) detectors employ 484 pixel Hybrid Photon Detectors (HPDs) as a photo-sensitive device. A total of 559 HPDs were produced over the course of two years and subjected to an exhaustive quality-assurance programme to verify that the operation meets specifications. Results of tests of the full production sample are presented and compared to expectations.