Operating the Hybrid Photon Detectors in the LHCb RICH counters

Results are presented on the commissioning and operation of Hybrid Photon Detectors used in the Ring Imaging Cherenkov detectors of LHCb. Cherenkov photons from proton–proton interactions at a centre-of-mass energy of 7 TeV have been recorded. An explanation is given of the steps that have been taken to achieve these results.