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arXiv · 1303.4817

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

A. Bondar·A. Buzulutskov·A. Dolgov·A. Grebenuk·E. Shemyakina·A. Sokolov·A. Breskin·D. Thers
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Abstract

The multi-channel optical readout of a THGEM multiplier coupled to a matrix of 3x3 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). At an avalanche charge gain of 160, the yield of the combined THGEM/GAPD-matrix multiplier amounted at ~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 dark matter search experiments.

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A. Bondar, A. Buzulutskov, A. Dolgov, A. Grebenuk, E. Shemyakina, A. Sokolov, A. Breskin, D. Thers. 2013-03-20. First demonstration of THGEM/GAPD-matrix optical readout in two-phase Cryogenic Avalanche Detector in Ar. https://doi.org/10.1016/j.nima.2013.07.089

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