3D modeling of electric fields in the LUX detector

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Title: 3D modeling of electric fields in the LUX detector
Authors: Akerib, DS
Alsum, S
Araujo, HM
Bai, X
Bailey, AJ
Balajthy, J
Beltrame, P
Bernard, EP
Bernstein, A
Biesiadzinski, TP
Boulton, EM
Bras, P
Byram, D
Cahn, SB
Carmona-Benitez, MC
Chan, C
Currie, A
Cutter, JE
Davison, TJR
Dobi, A
Druszkiewicz, E
Edwards, BN
Fallon, SR
Fan, A
Fiorucci, S
Gaitskell, RJ
Genovesi, J
Ghag, C
Gilchriese, MGD
Hall, CR
Hanhardt, M
Haselschwardt, SJ
Hertel, SA
Hogan, DP
Horn, M
Huang, DQ
Ignarra, CM
Jacobsen, RG
Ji, W
Kamdin, K
Kazkaz, K
Khaitan, D
Knoche, R
Larsen, NA
Lenardo, BG
Lesko, KT
Lindote, A
Lopes, MI
Manalaysay, A
Mannino, RL
Marzioni, MF
McKinsey, DN
Mei, D-M
Mock, J
Moongweluwan, M
Morad, JA
Murphy, ASJ
Nehrkorn, C
Nelson, HN
Neves, F
O'Sullivan, K
Oliver-Mallory, KC
Palladino, KJ
Pease, EK
Rhyne, C
Shaw, S
Shutt, TA
Silva, C
Solmaz, M
Solovov, VN
Sorensen, P
Sumner, TJ
Szydagis, M
Taylor, DJ
Taylor, WC
Tennyson, BP
Terman, PA
Tiedt, DR
To, WH
Tripathi, M
Tvrznikova, L
Uvarov, S
Velan, V
Verbus, JR
Webb, RC
White, JT
Whitis, TJ
Witherell, MS
Wolfs, FLH
Xu, J
Yazdani, K
Young, SK
Zhang, C
Item Type: Journal Article
Abstract: This work details the development of a three-dimensional (3D) electric field model for the LUX detector. The detector took data to search for weakly interacting massive particles (WIMPs) during two periods. After the first period completed, a time-varying non-uniform negative charge developed in the polytetrafluoroethylene (PTFE) panels that define the radial boundary of the detector's active volume. This caused electric field variations in the detector in time, depth and azimuth, generating an electrostatic radially-inward force on electrons on their way upward to the liquid surface. To map this behavior, 3D electric field maps of the detector's active volume were generated on a monthly basis. This was done by fitting a model built in COMSOL Multiphysics to the uniformly distributed calibration data that were collected on a regular basis. The modeled average PTFE charge density increased over the course of the exposure from -3.6 to −5.5 μC/m2. From our studies, we deduce that the electric field magnitude varied locally while the mean value of the field of ~200 V/cm remained constant throughout the exposure. As a result of this work the varying electric fields and their impact on event reconstruction and discrimination were successfully modeled.
Issue Date: 24-Nov-2017
Date of Acceptance: 6-Nov-2017
ISSN: 1748-0221
Publisher: IOP Publishing
Journal / Book Title: Journal of Instrumentation
Volume: 12
Copyright Statement: ©2017 IOP Publishing Ltd.
Keywords: Science & Technology
Instruments & Instrumentation
Analysis and statistical methods
Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc)
Noble liquid detectors (scintillation, ionization, double-phase)
Dark Matter detectors (WIMPs, axions, etc.)
Nuclear & Particles Physics
Publication Status: Published
Article Number: P11022
Appears in Collections:Physics
High Energy Physics
Faculty of Natural Sciences

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