Title
Electrostatic modes in multi-ion and pair-ion collisional plasmas Electrostatic modes in multi-ion and pair-ion collisional plasmas
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Woodbury, N.Y. ,
Subject
Physics
Source (journal)
Physics of plasmas. - Woodbury, N.Y.
Volume/pages
15(2008) :7 , 8 p.
ISSN
1070-664X
Article Reference
072104
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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. (C) 2008 American Institute of Physics.
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