Journal
JOURNAL OF INSTRUMENTATION
Volume 12, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1748-0221/12/11/P11022
Keywords
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.)
Categories
Funding
- U.S. Department of Energy (DOE) [DE-AC02-05CH11231, DE-AC05-06OR23100, DE-AC52-07NA27344, DE-FG01-91ER40618, DE-FG02-08ER41549, DE-FG02-11ER41738, DE-FG02-91ER40674, DE-FG02-91ER40688, DE-FG02-95ER40917, DE-NA0000979, DE-SC0006605, DE-SC0010010, DE-SC0015535]
- U.S. National Science Foundation [PHY-0750671, PHY-0801536, PHY-1003660, PHY-1004661, PHY-1102470, PHY-1312561, PHY-1347449, PHY-1505868, PHY-1636738]
- Center for Ultra-low Background Experiments in the Dakotas (CUBED)
- South Dakota School of Mines and Technology (SDSMT)
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/FIS-NUC/1525/2014]
- U.K. Royal Society under the International Exchange Scheme [IE120804]
- Science & Technology Facilities Council [ST/K502042/1, ST/K502406/1, ST/M503538/1]
- [RA0350]
- STFC [ST/N000242/1, ST/M003744/1, ST/K003208/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K003208/1, ST/N000242/1, ST/K003208/1 DMUK] Funding Source: researchfish
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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-uniformnegative 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. Thiswas done by fitting a model built inCOMSOLMultiphysics 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 mu C/m(2). From our studies, we deduce that the electric field magnitude varied locally while the mean value of the field of similar to 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.
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