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

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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 μs and 40 μs. The unusual characteristic property of slow components was that their contribution and time constants increased with electric field.

Original languageEnglish
Article numberC06064
Number of pages18
JournalJournal of Instrumentation
Volume15
Issue number6
DOIs
Publication statusPublished - Jun 2020

Keywords

  • Dark Matter detectors (WIMPs, axions, etc.)
  • Noble liquid detectors (scintillation, ionization, double-phase)
  • Time projection Chambers (TPC)
  • Neutrino detectors
  • XENON
  • LUMINESCENCE
  • EMISSION
  • KRYPTON
  • LIGHT

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