Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas

Sanchez Arriaga, Gonzalo y Pastor-moreno, D. (2014). Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas. "Physics of Plasmas", v. 21 ; pp.. ISSN 1070-664X. https://doi.org/10.1063/1.4889732.

Descripción

Título: Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas
Autor/es:
  • Sanchez Arriaga, Gonzalo
  • Pastor-moreno, D.
Tipo de Documento: Artículo
Título de Revista/Publicación: Physics of Plasmas
Fecha: 2014
Volumen: 21
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Física Aplicada a las Ingenierías Aeronáutica y Naval
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Current collection by positively polarized cylindrical Langmuir probes immersed in flowing plasmas is analyzed using a non-stationary direct Vlasov-Poisson code. A detailed description of plasma density spatial structure as a function of the probe-to-plasma relative velocity U is presented. Within the considered parametric domain, the well-known electron density maximum close to the probe is weakly affected by U. However, in the probe wake side, the electron density minimum becomes deeper as U increases and a rarified plasma region appears. Sheath radius is larger at the wake than at the front side. Electron and ion distribution functions show specific features that are the signature of probe motion. In particular, the ion distribution function at the probe front side exhibits a filament with positive radial velocity. It corresponds to a population of rammed ions that were reflected by the electric field close to the positively biased probe. Numerical simulations reveal that two populations of trapped electrons exist: one orbiting around the probe and the other with trajectories confined at the probe front side. The latter helps to neutralize the reflected ions, thus explaining a paradox in past probe theory.

Proyectos asociados

TipoCódigoAcrónimoResponsableTítulo
FP7262972BETsSin especificarSpace project

Más información

ID de Registro: 35435
Identificador DC: http://oa.upm.es/35435/
Identificador OAI: oai:oa.upm.es:35435
Identificador DOI: 10.1063/1.4889732
URL Oficial: http://scitation.aip.org/content/aip/journal/pop/21/7/10.1063/1.4889732
Depositado por: Memoria Investigacion
Depositado el: 05 Nov 2015 13:07
Ultima Modificación: 05 Nov 2015 13:07
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