Geiger Mode APD performance in a cryogenic two-phase Ar avalanche detector based on THGEMs

Details Geiger Mode APD performance in a cryogenic two-phase Ar avalanche detector based on THGEMs Geiger Mode APD performance in a cryogenic two-phase Ar avalanche detector based on THGEMs

2010-03-08

arxiv.org/abs/1003.1597v3

Nucl.Instrum.Meth.A628:364-368,2011

Physics

Instrumentation and Detectors

4 pages, 8 figures. Presented at Vienna Conference on Instrumentation (Feb 15-20, 2010, Vienna, Austria). Submitted to the Pro

Scientific paper

10.1016/j.nima.2010.07.002

Characteristic properties of a Geiger Mode APD (G-APD) in a THGEM-based cryogenic two-phase Ar avalanche detector were studied in view of potential applications in rare-event experiments. G-APD signal amplitude and noise characteristics at cryogenic temperatures turned out to be superior to those at room temperature. The effective detection of avalanche scintillations from THGEM-multiplier holes in two-phase Ar has been demonstrated using a G-APD without wavelength shifter. At an avalanche gain of 60, the avalanche scintillation yield measured by the G-APD was as high as 0.9 photoelectrons per avalanche electron, extrapolated to 4pi acceptance.

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