TY - JOUR

T1 - Observation of unusual slow components in electroluminescence signal of two-phase argon detector

AU - Bondar, A.

AU - Borisova, E.

AU - Buzulutskov, A.

AU - Frolov, E.

AU - Oleynikov, V.

AU - Sokolov, A.

PY - 2020/6

Y1 - 2020/6

N2 - 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.

AB - 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.

KW - Dark Matter detectors (WIMPs, axions, etc.)

KW - Noble liquid detectors (scintillation, ionization, double-phase)

KW - Time projection Chambers (TPC)

KW - Neutrino detectors

KW - XENON

KW - LUMINESCENCE

KW - EMISSION

KW - KRYPTON

KW - LIGHT

UR - http://www.scopus.com/inward/record.url?scp=85091310960&partnerID=8YFLogxK

U2 - 10.1088/1748-0221/15/06/C06064

DO - 10.1088/1748-0221/15/06/C06064

M3 - Article

AN - SCOPUS:85091310960

VL - 15

JO - Journal of Instrumentation

JF - Journal of Instrumentation

SN - 1748-0221

IS - 6

M1 - C06064

ER -