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

Ahedo Galilea, Eduardo y 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.

Descripción

Título: Two-region model for positive and negative plasma sheaths and its application to Hall thruster metallic anodes.
Autor/es:
  • Ahedo Galilea, Eduardo
  • Escobar, Diego
Tipo de Documento: Artículo
Título de Revista/Publicación: Physics of Plasmas
Fecha: Marzo 2008
Volumen: 15
Materias:
Palabras Clave Informales: full hydrodynamics ;kinetic; hall thruster metallic anodes;
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Fundamentos Matemáticos de la Tecnología Aeronáutica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 2193
Identificador DC: http://oa.upm.es/2193/
Identificador OAI: oai:oa.upm.es:2193
Identificador DOI: 10.1063/1.2888523
URL Oficial: http://scitation.aip.org/dbt/dbt.jsp?KEY=PHPAEN&Volume=15&Issue=3
Depositado por: Memoria Investigacion
Depositado el: 05 Feb 2010 09:59
Ultima Modificación: 20 Abr 2016 11:57
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