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Title: Electromagnetic drift waves dispersion for arbitrarily collisional plasmas

Abstract

The impacts of the electromagnetic effects on resistive and collisionless drift waves are studied. A local linear analysis on an electromagnetic drift-kinetic equation with Bhatnagar-Gross-Krook-like collision operator demonstrates that the model is valid for describing linear growth rates of drift wave instabilities in a wide range of plasma parameters showing convergence to reference models for limiting cases. The wave-particle interactions drive collisionless drift-Alfvén wave instability in low collisionality and high beta plasma regime. The Landau resonance effects not only excite collisionless drift wave modes but also suppress high frequency electron inertia modes observed from an electromagnetic fluid model in collisionless and low beta regime. Considering ion temperature effects, it is found that the impact of finite Larmor radius effects significantly reduces the growth rate of the drift-Alfvén wave instability with synergistic effects of high beta stabilization and Landau resonance.

Authors:
;  [1];  [2]
  1. Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093 (United States)
  2. Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375 (United States)
Publication Date:
OSTI Identifier:
22490001
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALFVEN WAVES; COLLISIONAL PLASMA; COLLISIONLESS PLASMA; ELECTRONS; HIGH-BETA PLASMA; ION TEMPERATURE; KINETIC EQUATIONS; LANDAU FLUCTUATIONS; LARMOR RADIUS; PARTICLE INTERACTIONS; PLASMA DRIFT; PLASMA INSTABILITY; RESONANCE; WAVE PROPAGATION

Citation Formats

Lee, Wonjae, E-mail: wol023@ucsd.edu, Krasheninnikov, Sergei I., E-mail: skrash@mae.ucsd.edu, and Angus, J. R. Electromagnetic drift waves dispersion for arbitrarily collisional plasmas. United States: N. p., 2015. Web. doi:10.1063/1.4927135.
Lee, Wonjae, E-mail: wol023@ucsd.edu, Krasheninnikov, Sergei I., E-mail: skrash@mae.ucsd.edu, & Angus, J. R. Electromagnetic drift waves dispersion for arbitrarily collisional plasmas. United States. doi:10.1063/1.4927135.
Lee, Wonjae, E-mail: wol023@ucsd.edu, Krasheninnikov, Sergei I., E-mail: skrash@mae.ucsd.edu, and Angus, J. R. 2015. "Electromagnetic drift waves dispersion for arbitrarily collisional plasmas". United States. doi:10.1063/1.4927135.
@article{osti_22490001,
title = {Electromagnetic drift waves dispersion for arbitrarily collisional plasmas},
author = {Lee, Wonjae, E-mail: wol023@ucsd.edu and Krasheninnikov, Sergei I., E-mail: skrash@mae.ucsd.edu and Angus, J. R.},
abstractNote = {The impacts of the electromagnetic effects on resistive and collisionless drift waves are studied. A local linear analysis on an electromagnetic drift-kinetic equation with Bhatnagar-Gross-Krook-like collision operator demonstrates that the model is valid for describing linear growth rates of drift wave instabilities in a wide range of plasma parameters showing convergence to reference models for limiting cases. The wave-particle interactions drive collisionless drift-Alfvén wave instability in low collisionality and high beta plasma regime. The Landau resonance effects not only excite collisionless drift wave modes but also suppress high frequency electron inertia modes observed from an electromagnetic fluid model in collisionless and low beta regime. Considering ion temperature effects, it is found that the impact of finite Larmor radius effects significantly reduces the growth rate of the drift-Alfvén wave instability with synergistic effects of high beta stabilization and Landau resonance.},
doi = {10.1063/1.4927135},
journal = {Physics of Plasmas},
number = 7,
volume = 22,
place = {United States},
year = 2015,
month = 7
}
  • The standard local linear analysis of drift waves in a plasma slab is generalized to be valid for arbitrarily collisional electrons by considering the electrons to be governed by the drift-kinetic equation with a BGK-like (Bhatnagar-Gross-Krook) collision operator. The obtained dispersion relation reduces to that found from collisionless kinetic theory when the collision frequency is zero. Electron temperature fluctuations must be retained in the standard fluid analysis in order to obtain good quantitative agreement with our general solution in the highly collisional limit. Any discrepancies between the fluid solution and our general solution in this limit are attributed to themore » limitations of the BGK collision operator. The maximum growth rates in both the collisional and collisionless limits are comparable and are both on the order of the fundamental drift wave frequency. The main role of the destabilizing mechanism is found to be in determining the parallel wave number at which the maximum growth rate will occur. The parallel wave number corresponding to the maximum growth rate is set by the wave-particle resonance condition in the collisionless limit and transitions to being set by the real frequency being on the order of the rate for electrons to diffuse a parallel wavelength in the collisional limit.« less