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arXiv · 2004.13355

Observation of unusual slow components in electroluminescence signal of two-phase argon detector

A. Bondar·E. Borisova·A. Buzulutskov·E. Frolov·V. Oleynikov·A. Sokolov
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Abstract

Proportional electroluminescence (EL) in noble gases is used in two-phase detectors for dark matter search to record ionization signals in the gas phase induced by particle scattering in the liquid phase (S2 signals). In this work, the EL pulse-shapes in a two-phase argon detector have for the first time been studied systematically in a wide range of reduced electric field, varying from 3 to 9 Td. The pulse-shapes were studied at different readout configurations and spectral ranges: using cryogenic PMTs and SiPMs, with and without a wavelength shifter (WLS), in the VUV and visible range. We observed the fast component and two unusual slow components, with time constants of about 5 $\mu$s and 40 $\mu$s. The unusual characteristic property of slow components was that their contribution and time constants increased with electric field.

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A. Bondar, E. Borisova, A. Buzulutskov, E. Frolov, V. Oleynikov, A. Sokolov. 2020-04-28. Observation of unusual slow components in electroluminescence signal of two-phase argon detector. https://doi.org/10.1088/1748-0221/15/06/c06064

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