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 language | English |
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Article number | C06064 |
Number of pages | 18 |
Journal | Journal of Instrumentation |
Volume | 15 |
Issue number | 6 |
DOIs | |
Publication status | Published - 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