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

Ahedo Galilea, Eduardo and 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.

Description

Title: Two-dimensional plasma expansion in a magnetic nozzle: Separation due to electron inertia
Author/s:
  • Ahedo Galilea, Eduardo
  • Merino, Mario
Item Type: Article
Título de Revista/Publicación: Physics of Plasmas
Date: August 2012
ISSN: 1070-664X
Volume: 19
Subjects:
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

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.

More information

Item ID: 16596
DC Identifier: http://oa.upm.es/16596/
OAI Identifier: oai:oa.upm.es:16596
DOI: 10.1063/1.4739791
Official URL: http://scitation.aip.org/content/aip/journal/pop/19/8/10.1063/1.4739791
Deposited by: Memoria Investigacion
Deposited on: 08 Apr 2014 14:08
Last Modified: 21 Apr 2016 16:55
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