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Title: Electron Drift and Longitudinal Diffusion in High Pressure Xenon-Helium Gas Mixtures

Abstract

We report new measurements of the drift velocity and longitudinal diffusion coefficients of electrons in pure xenon gas and in xenon-helium gas mixtures at 1-9 bar and electric field strengths of 50-300 V/cm. In pure xenon we find excellent agreement with world data at all E/P, for both drift velocity and diffusion coefficients. However, a larger value of the longitudinal diffusion coefficient than theoretical predictions is found at low E/P in pure xenon, below the range of reduced fields usually probed by TPC experiments. A similar effect is observed in xenon-helium gas mixtures at somewhat larger E/P. Drift velocities in xenon-helium mixtures are found to be theoretically well predicted. Although longitudinal diffusion in xenon-helium mixtures is found to be larger than anticipated, extrapolation based on the measured longitudinal diffusion coefficients suggest that the use of helium additives to reduce transverse diffusion in xenon gas remains a promising prospect.

Authors:
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
NEXT
OSTI Identifier:
1571813
Report Number(s):
arXiv:1902.05544; FERMILAB-PUB-19-518-ND-SCD
oai:inspirehep.net:1720254
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
JINST
Additional Journal Information:
Journal Volume: 14; Journal Issue: 08
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

McDonald, A. D., and et al. Electron Drift and Longitudinal Diffusion in High Pressure Xenon-Helium Gas Mixtures. United States: N. p., 2019. Web. doi:10.1088/1748-0221/14/08/P08009.
McDonald, A. D., & et al. Electron Drift and Longitudinal Diffusion in High Pressure Xenon-Helium Gas Mixtures. United States. doi:10.1088/1748-0221/14/08/P08009.
McDonald, A. D., and et al. Thu . "Electron Drift and Longitudinal Diffusion in High Pressure Xenon-Helium Gas Mixtures". United States. doi:10.1088/1748-0221/14/08/P08009. https://www.osti.gov/servlets/purl/1571813.
@article{osti_1571813,
title = {Electron Drift and Longitudinal Diffusion in High Pressure Xenon-Helium Gas Mixtures},
author = {McDonald, A. D. and et al.},
abstractNote = {We report new measurements of the drift velocity and longitudinal diffusion coefficients of electrons in pure xenon gas and in xenon-helium gas mixtures at 1-9 bar and electric field strengths of 50-300 V/cm. In pure xenon we find excellent agreement with world data at all E/P, for both drift velocity and diffusion coefficients. However, a larger value of the longitudinal diffusion coefficient than theoretical predictions is found at low E/P in pure xenon, below the range of reduced fields usually probed by TPC experiments. A similar effect is observed in xenon-helium gas mixtures at somewhat larger E/P. Drift velocities in xenon-helium mixtures are found to be theoretically well predicted. Although longitudinal diffusion in xenon-helium mixtures is found to be larger than anticipated, extrapolation based on the measured longitudinal diffusion coefficients suggest that the use of helium additives to reduce transverse diffusion in xenon gas remains a promising prospect.},
doi = {10.1088/1748-0221/14/08/P08009},
journal = {JINST},
number = 08,
volume = 14,
place = {United States},
year = {2019},
month = {8}
}

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