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First demonstration of THGEM/GAPD-matrix optical readout in a two-phase Cryogenic Avalanche Detector in Ar

Abstract : The multi-channel optical readout of a THGEM multiplier coupled to a matrix of 3×3 Geiger-mode APDs (GAPDs) was demonstrated in a two-phase Cryogenic Avalanche Detector (CRAD) in Ar. The GAPDs recorded THGEM-hole avalanches in the Near Infrared (NIR) spectral range. At an avalanche charge gain of 160, the yield of the combined THGEM/GAPD-matrix multiplier amounted to ~80 photoelectrons per 20 keV X-ray absorbed in the liquid phase. A spatial resolution of 2.5 mm (FWHM) has been measured for the impinging X-rays. This technique has potential applications in coherent neutrino-nucleus scattering and in dark matter search experiments.
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Submitted on : Tuesday, January 14, 2014 - 10:48:08 AM
Last modification on : Tuesday, June 4, 2019 - 6:45:39 PM

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A. Bondar, A. Buzulutskov, A. Dolgov, A. Grebenuk, E. Shemyakina, et al.. First demonstration of THGEM/GAPD-matrix optical readout in a two-phase Cryogenic Avalanche Detector in Ar. 13th Vienna Conference on Instrumentation, Feb 2013, Vienne, Austria. pp.213-216, ⟨10.1016/j.nima.2013.07.089⟩. ⟨in2p3-00929956⟩

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