  Two-phase Cryogenic Avalanche Detectors (CRADs) with combined THGEM/GAPD
multiplier have become an emerging potential technique for dark matter search
and coherent neutrino-nucleus scattering experiments. In such a multiplier the
THGEM hole avalanches are optically recorded in the Near Infrared (NIR) using a
matrix of Geiger-mode APDs (GAPDs). To select the proper sensor, the
performances of six GAPD types manufactured by different companies, namely by
Hamamatsu (MPPCs), CPTA (MRS APDs) and SensL (SiPMs), have been comparatively
studied at cryogenic temperatures when operated in two-phase CRADs in Ar at 87
K. While the GAPDs with ceramic packages failed to operate properly at
cryogenic temperatures, those with plastic packages, namely MPPC S10931-100P
and MRS APD 149-35, showed satisfactory performances at 87 K. In addition, MPPC
S10931-100P turned out to be superior in terms of the higher detection
efficiency, lower nose rate, lower pixel quenching resistor and better
characteristics reproducibility.
