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Module of Silicon Photomultipliers as a single photon detector of Cherenkov photons

4 May 2010, 12:40
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


Dr Rok Pestotnik (Jozef Stefan Institute)


We have studied the possibility to use silicon photomultipliers as a single photon detector in a proximity focusing RICH with aerogel radiator; such as counter is considered for the Belle-2 detector. Their main advantage over conventional photomultiplier tubes is their operation in high magnetic fields. Their disadvantage is the relatively high dark noise count rate ( ~MHz/mm2) which can be overcome by using a narrow time window in the data acquisition. A module, consisting of 64 (8x8) Hamamatsu MPPC S10362-11-100P silicon photomultipliers, has been constructed and tested with Cerenkov photons emitted in an aerogel radiator by 120 GeV/c pions from the CERN T4-H6 beam. To increase the signal to noise ratio, i.e. to increase the effective surface on which light is detected, the light concentrators have been employed. In the beam test setup with 1 cm thick aerogel of n=1.03 we obtained 1.6 photons per ring. The light yield increased by a factor of 2.3 to 3.6 photons per ring when the light concentrators were used. With the final focusing radiator of thickness of 4 cm and n~1.05 and with the improved light guide production we expect to detect about 30 photons per ring.
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Primary authors

Prof. Aleš Stanovnik (Jozef Stefan Institute) Dr Hassan Chagani (Jozef Stefan Institute) Prof. Peter Križan (Jozef Stefan Institute) Mr Rok Dolenec (Jozef Stefan Institute) Dr Rok Pestotnik (Jozef Stefan Institute) Prof. Samo Korpar (Jozef Stefan Institute)

Presentation Materials