Physics – Instrumentation and Detectors
Scientific paper
2008-12-02
Nucl.Phys.Proc.Suppl.197:283-287,2009
Physics
Instrumentation and Detectors
to appear in Proc. 11th Topical Seminar on Innovative Particle and Radiation Detectors, 1-4 October 2008, Siena, Italy; Nucl.
Scientific paper
10.1016/j.nuclphysbps.2009.10.08
A novel photon detector, the Silicon Photomultiplier (SiPM), has been tested in proximity focusing Ring Imaging Cherenkov (RICH) counters that were exposed to cosmic-ray particles in Ljubljana, and a 2 GeV electron beam at the KEK research facility. This type of RICH detector is a candidate for the particle identification detector upgrade of the BELLE detector at the KEK B-factory, for which the use of SiPMs, microchannel plate photomultiplier tubes or hybrid avalanche photodetectors, rather than traditional Photomultiplier Tubes (PMTs) is essential due to the presence of high magnetic fields. In both experiments, SiPMs are found to compare favourably with PMTs, with higher photon detection rates per unit area. Through the use of hemispherical and truncated pyramid light guides to concentrate photons onto the active surface area, the light yield increases significantly. An estimate of the contribution to dark noise from false coincidences between SiPMs in an array is also presented.
Adachi Ichiro
Chagani H.
Dolenec R.
Hara Kaori
Iijima Toru
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