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Title: Electron parallel velocity and temperature gradient driven electrostatic fluctuations in nonuniform magnetoplasmas

Abstract

The combined effects of the electron-temperature (ET) and parallel electron velocity (PEV) gradients on electrostatic instabilities in a nonuniform magnetoplasma are investigated. For this purpose, a hybrid approach is used, in which the electrons are treated as a magnetized fluid, while the ions are described by means of a kinetic description. A new dispersion relation is derived, which shows how different plasma modes are linear coupled in the presence of the ET and PEV gradients. The dispersion relation is analyzed analytically (numerically) to demonstrate the instability of long- and short-wavelength electrostatic modes (to examine the combined effects of ET and PEV gradients) in nonuniform magnetoplasmas. The present results may be useful in understanding the salient features of nonthermal fluctuations and associated anomalous cross-field electron fluxes in forthcoming laboratory experiments.

Authors:
; ;  [1]
  1. Institut fuer Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultaet fuer Physik und Astronomie, Ruhr-Universitaet Bochum, D-44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
20960133
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 1; Other Information: DOI: 10.1063/1.2430521; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DISPERSION RELATIONS; ELECTRON TEMPERATURE; ELECTRONS; FLUCTUATIONS; ION TEMPERATURE; IONS; MAGNETOHYDRODYNAMICS; PLASMA; PLASMA INSTABILITY; PLASMA WAVES; TEMPERATURE GRADIENTS; VELOCITY

Citation Formats

Shukla, P. K., Coppi, B., and Eliasson, B.. Electron parallel velocity and temperature gradient driven electrostatic fluctuations in nonuniform magnetoplasmas. United States: N. p., 2007. Web. doi:10.1063/1.2430521.
Shukla, P. K., Coppi, B., & Eliasson, B.. Electron parallel velocity and temperature gradient driven electrostatic fluctuations in nonuniform magnetoplasmas. United States. doi:10.1063/1.2430521.
Shukla, P. K., Coppi, B., and Eliasson, B.. Mon . "Electron parallel velocity and temperature gradient driven electrostatic fluctuations in nonuniform magnetoplasmas". United States. doi:10.1063/1.2430521.
@article{osti_20960133,
title = {Electron parallel velocity and temperature gradient driven electrostatic fluctuations in nonuniform magnetoplasmas},
author = {Shukla, P. K. and Coppi, B. and Eliasson, B.},
abstractNote = {The combined effects of the electron-temperature (ET) and parallel electron velocity (PEV) gradients on electrostatic instabilities in a nonuniform magnetoplasma are investigated. For this purpose, a hybrid approach is used, in which the electrons are treated as a magnetized fluid, while the ions are described by means of a kinetic description. A new dispersion relation is derived, which shows how different plasma modes are linear coupled in the presence of the ET and PEV gradients. The dispersion relation is analyzed analytically (numerically) to demonstrate the instability of long- and short-wavelength electrostatic modes (to examine the combined effects of ET and PEV gradients) in nonuniform magnetoplasmas. The present results may be useful in understanding the salient features of nonthermal fluctuations and associated anomalous cross-field electron fluxes in forthcoming laboratory experiments.},
doi = {10.1063/1.2430521},
journal = {Physics of Plasmas},
number = 1,
volume = 14,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}