Two-region model for positive and negative plasma sheaths and its application to Hall thruster metallic anodes.

Ahedo Galilea, Eduardo and Escobar, Diego (2008). Two-region model for positive and negative plasma sheaths and its application to Hall thruster metallic anodes.. "Physics of Plasmas", v. 15 (n. 3); pp.. ISSN 1070-664X. https://doi.org/10.1063/1.2888523.

Description

Title: Two-region model for positive and negative plasma sheaths and its application to Hall thruster metallic anodes.
Author/s:
  • Ahedo Galilea, Eduardo
  • Escobar, Diego
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: March 2008
ISSN: 1070-664X
Volume: 15
Subjects:
Freetext Keywords: full hydrodynamics ;kinetic; hall thruster metallic anodes;
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Fundamentos Matemáticos de la Tecnología Aeronáutica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

An asymptotic presheath/sheath model for positive and negative sheaths in front of a conducting electrode, with a continuous parametric transition at the no-sheath case, is presented. Key aspects of the model are as follows: full hydrodynamics of both species in the presheath; a kinetic formulation with a truncated distribution function for the repelled species within the sheath; and the fulfillment of the marginal Bohm condition at the sheath edge, in order to match the two formulations of the repelled species. The sheath regime depends on the ratios of particle fluxes and sound speeds between the two species. The presheath model includes the effect of a magnetic field parallel to the wall on electrons. An asymptotic, parametric study of the anode presheath is carried out in terms of the local ion-to-electron flux ratio and Hall parameter. The drift-diffusive model of magnetized electrons fails in a parametric region that includes parts of the negative sheath regime. In the case of the Hall parameter vanishing near the electrode and a weakly collisional plasma, a quasisonic, quasineutral plateau forms next to the sheath edge.

More information

Item ID: 2193
DC Identifier: http://oa.upm.es/2193/
OAI Identifier: oai:oa.upm.es:2193
DOI: 10.1063/1.2888523
Official URL: http://scitation.aip.org/dbt/dbt.jsp?KEY=PHPAEN&Volume=15&Issue=3
Deposited by: Memoria Investigacion
Deposited on: 05 Feb 2010 09:59
Last Modified: 20 Apr 2016 11:57
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