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

Sanchez Arriaga, Gonzalo and 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.

Description

Title: Direct Vlasov simulations of electron-attracting cylindrical Langmuir probes in flowing plasmas
Author/s:
  • Sanchez Arriaga, Gonzalo
  • Pastor-moreno, D.
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: 2014
ISSN: 1070-664X
Volume: 21
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Física Aplicada a las Ingenierías Aeronáutica y Naval
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7262972BETSUniversidad Politécnica de MadridPropellantless deorbiting of space debris by bare electrodynamic tethers

More information

Item ID: 35435
DC Identifier: http://oa.upm.es/35435/
OAI Identifier: oai:oa.upm.es:35435
DOI: 10.1063/1.4889732
Official URL: http://scitation.aip.org/content/aip/journal/pop/21/7/10.1063/1.4889732
Deposited by: Memoria Investigacion
Deposited on: 05 Nov 2015 13:07
Last Modified: 14 May 2019 11:15
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