Electrostatic modes in multi-ion and pair-ion collisional plasmas

J. Vranjes*, D. Petrovic, B. P. Pandey, S. Poedts

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The physics of plasmas containing positive and negative ions is discussed with special attention to the recently produced pair-ion plasma containing ions of equal mass and opposite charge. The effects of the density gradient in the direction perpendicular to the ambient magnetic field vector are discussed. The possible presence of electrons is discussed in the context of plasma modes propagating at an angle with respect to the magnetic field vector. It is shown that the electron plasma mode may become a backward mode in the presence of a density gradient, and this behavior may be controlled either by the electron number density or the mode number in the perpendicular direction. In plasmas with hot electrons an instability may develop, driven by the combination of electron collisions and the density gradient, and in the regime of a sound ions' response. In the case of a pure pair-ion plasma, for lower frequencies and for parameters close to those used in the recent experiments, the perturbed ions may feel the effects of the magnetic field. In this case the plasma mode also becomes backward, resembling features of an experimentally observed but yet unexplained backward mode.

Original languageEnglish
Article number072104
Pages (from-to)1-8
Number of pages8
JournalPhysics of Plasmas
Volume15
Issue number7
DOIs
Publication statusPublished - 2008

Bibliographical note

Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of plasmas, Vol. 15, Issue 7, pp.072104-1 - 072104-8, and may be found at http://link.aip.org/link/?PHPAEN/15/072104/1

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