RICH photon detector module based on geiger-mode APDs

Samo Korpar, Hassan Chagani, Rok Dolenec, Peter Križan, Rok Pestotnik, Aleš Stanovnik

Research output: Contribution to journalConference articlepeer-review


The possibilities offered by Geiger-mode APDs, also known as silicon photomultipliers, for detection of Cherenkov photons emitted by pions in an aerogel radiator, have been investigated. The main issue is the detection of single photons in the relatively high background of noise pulses. A suitably narrow coincidence time window eliminates most of this background, while the use of light concentrators increases the acceptance, i.e. the sensitivie surface over which Cherenkov photons are collected. With such techniques, we have measured a number corresponding to 3.7 detected photons per ring. However, a thicker radiator and other improvements of the experimental apparatus, might increase this figure for a factor of 10. Such a ring imaging Cherenkov detector would then meet the requirements for particle identification inside the upgraded Belle spectrometer.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - Dec 1 2009
EventInternational Workshop on New Photon Detectors, PD 2009 - Matsumoto, Japan
Duration: Jun 24 2009Jun 26 2009


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