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Title: Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches

Abstract

Electron diffusion in a liquid xenon time projection chamber has recently been used to infer the z coordinate of a particle interaction, from the width of the electron signal. The goal of this technique is to reduce the background event rate by discriminating edge events from bulk events. Analyses of dark matter search data which employ it would benefit from increased longitudinal electron diffusion. We show that a significant increase is expected if the applied electric field is decreased. This observation is trivial to implement but runs contrary to conventional wisdom and practice. We also extract a first measurement of the longitudinal diffusion coefficient, and confirm the expectation that electron diffusion in liquid xenon is highly anisotropic under typical operating conditions.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1022901
Report Number(s):
LLNL-JRNL-471078
Journal ID: ISSN 0167-5087; NIMRD9; TRN: US1104423
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Nuclear Instruments and Methods in Physics Research, vol. 635, n/a, February 3, 2011, pp. 41
Additional Journal Information:
Journal Volume: 635; Journal ID: ISSN 0167-5087
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; DIFFUSION; ELECTRIC FIELDS; ELECTRONS; NONLUMINOUS MATTER; PARTICLE INTERACTIONS; SENSITIVITY; TIME PROJECTION CHAMBERS; XENON

Citation Formats

Sorensen, P. Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches. United States: N. p., 2011. Web. doi:10.1016/j.nima.2011.01.089.
Sorensen, P. Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches. United States. doi:10.1016/j.nima.2011.01.089.
Sorensen, P. Mon . "Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches". United States. doi:10.1016/j.nima.2011.01.089. https://www.osti.gov/servlets/purl/1022901.
@article{osti_1022901,
title = {Anisotropic diffusion of electrons in liquid xenon with application to improving the sensitivity of direct dark matter searches},
author = {Sorensen, P},
abstractNote = {Electron diffusion in a liquid xenon time projection chamber has recently been used to infer the z coordinate of a particle interaction, from the width of the electron signal. The goal of this technique is to reduce the background event rate by discriminating edge events from bulk events. Analyses of dark matter search data which employ it would benefit from increased longitudinal electron diffusion. We show that a significant increase is expected if the applied electric field is decreased. This observation is trivial to implement but runs contrary to conventional wisdom and practice. We also extract a first measurement of the longitudinal diffusion coefficient, and confirm the expectation that electron diffusion in liquid xenon is highly anisotropic under typical operating conditions.},
doi = {10.1016/j.nima.2011.01.089},
journal = {Nuclear Instruments and Methods in Physics Research, vol. 635, n/a, February 3, 2011, pp. 41},
issn = {0167-5087},
number = ,
volume = 635,
place = {United States},
year = {2011},
month = {2}
}