Electron drift and longitudinal diffusion in high pressure xenon-helium gas mixtures

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 veloci...

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Detalles Bibliográficos
Autores: NEXT Collaboration, Álvarez Puerta, Vicente, Benlloch Rodríguez, José María, Botas, A., Cárcel, Sara, Carrión, J. V., Díaz Medina, José, Felkai, Ryan, Kekic, Marija, Laing, Andrew, López-March, Neus, Martínez Pérez, Alberto, Martinez-Lema, G., Musti, M., Muñoz Vidal, Javier, Nebot Guinot, Miquel, Novella, Pau, Palmeiro, Brais, Querol, Marc, Renner, Joshua, Rodríguez Samaniego, Javier, Romo Luque, Carmen, Simón, Ander, Sorel, Michel, Yahlali, Nadia
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/208418
Acceso en línea:http://hdl.handle.net/10261/208418
Access Level:acceso abierto
Descripción
Sumario: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.

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