Two-dimensional plasma expansion in a magnetic nozzle: Separation due to electron inertia

Ahedo Galilea, Eduardo y Merino, Mario (2012). Two-dimensional plasma expansion in a magnetic nozzle: Separation due to electron inertia. "Physics of Plasmas", v. 19 ; pp.. ISSN 1070-664X. https://doi.org/10.1063/1.4739791.

Descripción

Título: Two-dimensional plasma expansion in a magnetic nozzle: Separation due to electron inertia
Autor/es:
  • Ahedo Galilea, Eduardo
  • Merino, Mario
Tipo de Documento: Artículo
Título de Revista/Publicación: Physics of Plasmas
Fecha: Agosto 2012
Volumen: 19
Materias:
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

A previous axisymmetric model of the supersonic expansion of a collisionless, hot plasma in a divergent magnetic nozzle is extended here in order to include electron-inertia effects. Up to dominant order on all components of the electron velocity, electron momentum equations still reduce to three conservation laws. Electron inertia leads to outward electron separation from the magnetic streamtubes. The progressive plasma filling of the adjacent vacuum region is consistent with electron-inertia being part of finite electron Larmor radius effects, which increase downstream and eventually demagnetize the plasma. Current ambipolarity is not fulfilled and ion separation can be either outwards or inwards of magnetic streamtubes, depending on their magnetization. Electron separation penalizes slightly the plume efficiency and is larger for plasma beams injected with large pressure gradients. An alternative nonzero electron-inertia model [E. Hooper, J. Propul. Power 9, 757 (1993)] based on cold plasmas and current ambipolarity, which predicts inwards electron separation, is discussed critically. A possible competition of the gyroviscous force with electron-inertia effects is commented briefly.

Más información

ID de Registro: 16596
Identificador DC: http://oa.upm.es/16596/
Identificador OAI: oai:oa.upm.es:16596
Identificador DOI: 10.1063/1.4739791
URL Oficial: http://scitation.aip.org/content/aip/journal/pop/19/8/10.1063/1.4739791
Depositado por: Memoria Investigacion
Depositado el: 08 Abr 2014 14:08
Ultima Modificación: 21 Abr 2016 16:55
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