Electron drift and longitudinal diffusion in high pressure xenon-helium gas mixtures
Here, 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. Furthermore, 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.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Texas, Arlington, TX (United States)
- Sponsoring Organization:
- European Union, Horizon 2020 Research and Innovation Programme; USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The NEXT Collaboration
- Grant/Contract Number:
- AC02-06CH11357; SC0019054; SC0019223; RYC-2015-18820; FIS2014-53371-C04; SEV-2014-0398; MDM-2016-0692; PROMETEO/2016/120; SEJI/2017/011; PTDC/FIS-NUC/2525/2014; UID/FIS/04559/2013; PD/BD/105921/2014; SFRH/BPD/109180/2015; SFRH/BPD/76842/2011
- OSTI ID:
- 1591764
- Alternate ID(s):
- OSTI ID: 1571813; OSTI ID: 1908624; OSTI ID: 1908640
- Report Number(s):
- arXiv:1902.05544; FERMILAB-PUB-19-518-ND-SCD; 157728; TRN: US2101054
- Journal Information:
- Journal of Instrumentation, Vol. 14, Issue 08; ISSN 1748-0221
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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