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3D Modeling of Electric Fields in the LUX Detector

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arxiv 1709.00095 v4 pith:XRKIBMNC submitted 2017-08-31 physics.ins-det hep-exphysics.comp-ph

3D Modeling of Electric Fields in the LUX Detector

LUX Collaboration: D. S. Akerib , S. Alsum , H. M. Ara\'ujo , X. Bai , A. J. Bailey , J. Balajthy , P. Beltrame , E. P. Bernard
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A. Bernstein T. P. Biesiadzinski E. M. Boulton P. Br\'as D. Byram S. B. Cahn M. C. Carmona-Benitez C. Chan A. Currie J. E. Cutter T. J. R. Davison A. Dobi E. Druszkiewicz B. N. Edwards S. R. Fallon A. Fan S. Fiorucci R. J. Gaitskell J. Genovesi C. Ghag M. G. D. Gilchriese C. R. Hall M. Hanhardt S. J. Haselschwardt S. A. Hertel D. P. Hogan M. Horn D. Q. Huang C. M. Ignarra R. G. Jacobsen W. Ji K. Kamdin K. Kazkaz D. Khaitan R. Knoche N. A. Larsen B. G. Lenardo K. T. Lesko A. Lindote M. I. Lopes A. Manalaysay R. L. Mannino M. F. Marzioni D. N. McKinsey D. M. Mei J. Mock M. Moongweluwan J. A. Morad A. St. J. Murphy C. Nehrkorn H. N. Nelson F. Neves K. O'Sullivan K. C. Oliver-Mallory K. J. Palladino E. K. Pease C. Rhyne S. Shaw T. A. Shutt C. Silva M. Solmaz V. N. Solovov P. Sorensen T. J. Sumner M. Szydagis D. J. Taylor W. C. Taylor B. P. Tennyson P. A. Terman D. R. Tiedt W. H. To M. Tripathi L. Tvrznikova S. Uvarov V. Velan J. R. Verbus R. C. Webb J. T. White T. J. Whitis M. S. Witherell F. L. H. Wolfs J. Xu K. Yazdani S. K. Young C. Zhang
This is my paper
classification physics.ins-det hep-exphysics.comp-ph
keywords detectorelectricfieldwereactivebasisbuiltcharge
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 during two periods of searching for weakly interacting massive particle (WIMP) searches. 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 built 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 $-5.5~\mu$C/m$^2$. From our studies, we deduce that the electric field magnitude varied while the mean value of the field of $\sim200$~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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