skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Parallel and lower hybrid turbulence in low {beta} plasmas driven by strong parallel currents and the resulting parallel electron and perpendicular ion energization

Abstract

In plasmas with strong field aligned currents, the most unstable mode is not always at parallel propagation, but may be at intermediate and very oblique angles. 2D particle simulations are performed in order to examine the interaction between the plasma waves at various angles and the electron and ion distributions in low {beta} collisionless plasmas with strong electron drifts. The parallel Buneman instability is known to arise in this situation, but the simulations demonstrate that the very oblique lower hybrid (LH) waves, until recently considered unimportant, may actually play a role just as significant as the waves at parallel propagation. The LH waves are energized by a current-driven linear instability, which may be seen as the oblique limit of the Buneman or ion-acoustic instability. The simulations resolve strong LH turbulence, substantial perpendicular ion tail heating and parallel electron heating. The combined action of parallel and oblique modes results in more complete electron relaxation than may be produced by the parallel Buneman instability alone.

Authors:
;  [1]
  1. School of Physics, Sydney University, NSW 2006, Sydney (Australia)
Publication Date:
OSTI Identifier:
20960081
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 1; Other Information: DOI: 10.1063/1.2409764; (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; COLLISIONLESS PLASMA; CURRENTS; ELECTROMAGNETIC RADIATION; ELECTRON DRIFT; ELECTRONS; ION ACOUSTIC WAVES; IONS; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; PLASMA BEAM INJECTION; PLASMA INSTABILITY; PLASMA SIMULATION; TURBULENCE

Citation Formats

McMillan, Ben F., and Cairns, Iver H. Parallel and lower hybrid turbulence in low {beta} plasmas driven by strong parallel currents and the resulting parallel electron and perpendicular ion energization. United States: N. p., 2007. Web. doi:10.1063/1.2409764.
McMillan, Ben F., & Cairns, Iver H. Parallel and lower hybrid turbulence in low {beta} plasmas driven by strong parallel currents and the resulting parallel electron and perpendicular ion energization. United States. doi:10.1063/1.2409764.
McMillan, Ben F., and Cairns, Iver H. Mon . "Parallel and lower hybrid turbulence in low {beta} plasmas driven by strong parallel currents and the resulting parallel electron and perpendicular ion energization". United States. doi:10.1063/1.2409764.
@article{osti_20960081,
title = {Parallel and lower hybrid turbulence in low {beta} plasmas driven by strong parallel currents and the resulting parallel electron and perpendicular ion energization},
author = {McMillan, Ben F. and Cairns, Iver H.},
abstractNote = {In plasmas with strong field aligned currents, the most unstable mode is not always at parallel propagation, but may be at intermediate and very oblique angles. 2D particle simulations are performed in order to examine the interaction between the plasma waves at various angles and the electron and ion distributions in low {beta} collisionless plasmas with strong electron drifts. The parallel Buneman instability is known to arise in this situation, but the simulations demonstrate that the very oblique lower hybrid (LH) waves, until recently considered unimportant, may actually play a role just as significant as the waves at parallel propagation. The LH waves are energized by a current-driven linear instability, which may be seen as the oblique limit of the Buneman or ion-acoustic instability. The simulations resolve strong LH turbulence, substantial perpendicular ion tail heating and parallel electron heating. The combined action of parallel and oblique modes results in more complete electron relaxation than may be produced by the parallel Buneman instability alone.},
doi = {10.1063/1.2409764},
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}
}