Abstract
Two-phase Cryogenic Avalanche Detectors (CRADs) with combined THGEM/GAPD-matrix multiplier have become an emerging technique in rare-event experiments such as those of coherent neutrino-nucleus scattering and dark matter search. In this work we continue to study the performance of the two-phase CRAD in Ar with THGEM/GAPD-matrix charge/optical readout. The matrix was composed of a 3×3 array of GAPDs (Geiger-mode APDs), optically recording THGEM-hole avalanches in the Near Infrared (NIR). Gain, time, amplitude and spatial resolution properties of the combined multiplier are described.
Highlights
In this work we continue to study the performance of the two-phase Cryogenic Avalanche Detectors (CRADs) in Ar with THGEM/Geiger-mode APDs (GAPDs)-matrix charge/optical readout
The matrix was composed of a 3x3 array of GAPDs (Geiger-mode APDs), optically recording THGEM-hole avalanches in the Near Infrared (NIR)
The development of two-phase Cryogenic Avalanche Detectors (CRADs) based on noble liquids [1] is relevant in the field of rare-event experiments for dark matter search [2] and coherent neutrino-nucleus scattering [3, 4]
Summary
The development of two-phase Cryogenic Avalanche Detectors (CRADs) based on noble liquids [1] is relevant in the field of rare-event experiments for dark matter search [2] and coherent neutrino-nucleus scattering [3, 4]. The multiplied electrons can be recorded directly using a charge readout [6, 7] or indirectly using an optical readout of avalanche photons with either Geiger-mode APDs (GAPDs) [8] or CCD camera [9]. Gain values as large as 1000 were obtained in a two-phase CRAD operated in Ar with the double-THGEM multiplier [10]. This gain value is not enough for effective operation with ultimate sensitivity, i.e. in single-electron counting mode and with precise 2D readout. In this work we continue to study the performance of the two-phase CRAD in Ar with THGEM/GAPD-matrix charge/optical readout; first results of the performance of such a combined multiplier were presented elsewhere [14]
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