2-7 May 2010
Oustau Calendal Conference Center
Europe/Paris timezone
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Operating the Hybrid Photon Detectors in the LHCb RICH counters

4 May 2010, 12:15
Oustau Calendal Conference Center

Oustau Calendal Conference Center

Cassis, France
Oral presentation Photon detection for Cherenkov counters Photon detection for Cherenkov Counters - solid state and hybrid devices


Mr Ross Young (Edinburgh University)


Over the last two years the LHCb experiment has commissioned over 500 Hybrid Photon Detectors (HPD) in its RICH detectors. Here we will report about results of the extensive monitoring programme for these novel photon sensitive devices. Recently the first Cherenkov photons produced by LHC beam particles were reconstructed. Data have been taken under a variety of different run conditions. HPDs have been regularly tested with and without external light sources. Dark runs facilitate identifying noisy pixels. Continuous-wave laser sources provide constant illumination on the photodetectors, and are used primarily for ion-feedback and image position measurements. Tests of the vacuum quality are regularly performed: most HPDs retain an excellent vacuum quality. However few show a linear increase in ion feedback over time - evidence of an intrinsic increase in residual gas concentration. Overall these data show an excellent performance of the HPDs with low dark count and noise rates. First results from data with LHC beams including detector occupancies and photon yield will also be reported.
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Primary author

Mr Ross Young (Edinburgh University)

Presentation Materials