Research output: Contribution to journal › Article › peer-review
Observation of an Unusual Long Component in the Electroluminescence of a Two-Phase Argon Detector. / Bondar, A.; Borisova, E.; Buzulutskov, A. et al.
In: Physics of Atomic Nuclei, Vol. 83, No. 6, 11.2020, p. 949-953.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Observation of an Unusual Long Component in the Electroluminescence of a Two-Phase Argon Detector
AU - Bondar, A.
AU - Borisova, E.
AU - Buzulutskov, A.
AU - Oleynikov, V.
AU - Sokolov, A.
AU - Frolov, E.
N1 - Funding Information: This work was supported in part by Russian Science Foundation (project no. 20-12-00008). Publisher Copyright: © 2020, Pleiades Publishing, Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2020/11
Y1 - 2020/11
N2 - Proportional electroluminescence in noble gases is used in two-phase detectors for dark-matter searches for detecting ionization signals in a liquid phase (S2 signals). Time features of electroluminescence signals in a two-phase argon detector were studied systematically both over a broad range of reduced electric fields—from 3 to 9 Td (Townsend)—and for various methods of optical readout in different spectral ranges—by means of cryogenic photomultiplier tubes (PMTs) and silicon photomultipliers (SiPMs), with a wavelength shifter and without it, in vacuum ultraviolet and visible ranges. Both a fast and a slow component of signals were observed. An observation of an unusual long component of the S2 signal is described in the present article. This component has a time constant of about 40 μs, which grows with increasing electric field, and can not be explained in terms of known scintillation mechanisms. Also, it is shown here that the fast component can be used to measure the thickness of the electroluminescence gap to a submillimeter precision. The results obtained in these experiments may find practical applications in the DarkSide experiment devoted to searches for dark matter.
AB - Proportional electroluminescence in noble gases is used in two-phase detectors for dark-matter searches for detecting ionization signals in a liquid phase (S2 signals). Time features of electroluminescence signals in a two-phase argon detector were studied systematically both over a broad range of reduced electric fields—from 3 to 9 Td (Townsend)—and for various methods of optical readout in different spectral ranges—by means of cryogenic photomultiplier tubes (PMTs) and silicon photomultipliers (SiPMs), with a wavelength shifter and without it, in vacuum ultraviolet and visible ranges. Both a fast and a slow component of signals were observed. An observation of an unusual long component of the S2 signal is described in the present article. This component has a time constant of about 40 μs, which grows with increasing electric field, and can not be explained in terms of known scintillation mechanisms. Also, it is shown here that the fast component can be used to measure the thickness of the electroluminescence gap to a submillimeter precision. The results obtained in these experiments may find practical applications in the DarkSide experiment devoted to searches for dark matter.
UR - http://www.scopus.com/inward/record.url?scp=85101038800&partnerID=8YFLogxK
U2 - 10.1134/S1063778820060071
DO - 10.1134/S1063778820060071
M3 - Article
AN - SCOPUS:85101038800
VL - 83
SP - 949
EP - 953
JO - Physics of Atomic Nuclei
JF - Physics of Atomic Nuclei
SN - 1063-7788
IS - 6
ER -
ID: 27865538