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Título: | Electron drift and longitudinal diffusion in high pressure xenon-helium gas mixtures |
Autor: | NEXT Collaboration; Álvarez Puerta, Vicente CSIC; Benlloch Rodríguez, José María; Botas, A.; Cárcel, Sara CSIC; Carrion, J.V.; Díaz Medina, José; Felkai, Ryan; Kekic, Marija; Laing, Andrew CSIC; López-March, Neus CSIC; Martínez Pérez, Alberto; Martinez-Lema, G.; Musti, M.; Muñoz Vidal, Javier; Nebot Guinot, Miquel CSIC ORCID; Novella, Pau CSIC ORCID; Palmeiro, Brais; Querol, Marc; Renner, Joshua; Rodríguez Samaniego, Javier CSIC; Romo Luque, Carmen; Simón, Ander CSIC; Sorel, Michel CSIC ORCID; Simón, Ander CSIC; Yahlali, Nadia CSIC ORCID | Fecha de publicación: | ago-2019 | Editor: | IOP Publishing | Citación: | Journal of Instrumentation 14: P08009 (2019) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1088/1748-0221/14/08/P08009 | URI: | http://hdl.handle.net/10261/208418 | DOI: | 10.1088/1748-0221/14/08/P08009 | Identificadores: | doi: 10.1088/1748-0221/14/08/P08009 issn: 1748-0221 |
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