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Title: Nonlinear excitation of geodesic acoustic modes by drift waves

Abstract

In this paper, two mode-coupling analyses for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by drift waves are presented. The first approach is a coherent parametric process, which leads to a three-wave resonant interaction. This investigation allows for the drift waves and the GAMs to have comparable scales. The second approach uses the wave-kinetic equations for the drift waves, which then couples to the GAMs. This requires that the GAM scale length be large compared to the wave packet associated with the drift waves. The resonance conditions for these two cases lead to specific predictions of the radial wave number of the excited GAMs.

Authors:
; ; ;  [1];  [2];  [3]
  1. Saha Institute of Nuclear Research, 1/AF Bidhannagar, Kolkata 700064 (India)
  2. (India)
  3. (United States)
Publication Date:
OSTI Identifier:
20974978
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2732167; (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; EXCITATION; FORECASTING; INTERACTIONS; KINETIC EQUATIONS; NONLINEAR PROBLEMS; PARAMETRIC INSTABILITIES; PLASMA; PLASMA DRIFT; RESONANCE; TOKAMAK DEVICES; WAVE PACKETS; WAVE PROPAGATION

Citation Formats

Chakrabarti, N., Singh, R., Kaw, P. K., Guzdar, P. N., Institute for Plasma Research, Bhat, Gandhinagar, 382428, and Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742. Nonlinear excitation of geodesic acoustic modes by drift waves. United States: N. p., 2007. Web. doi:10.1063/1.2732167.
Chakrabarti, N., Singh, R., Kaw, P. K., Guzdar, P. N., Institute for Plasma Research, Bhat, Gandhinagar, 382428, & Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742. Nonlinear excitation of geodesic acoustic modes by drift waves. United States. doi:10.1063/1.2732167.
Chakrabarti, N., Singh, R., Kaw, P. K., Guzdar, P. N., Institute for Plasma Research, Bhat, Gandhinagar, 382428, and Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742. Tue . "Nonlinear excitation of geodesic acoustic modes by drift waves". United States. doi:10.1063/1.2732167.
@article{osti_20974978,
title = {Nonlinear excitation of geodesic acoustic modes by drift waves},
author = {Chakrabarti, N. and Singh, R. and Kaw, P. K. and Guzdar, P. N. and Institute for Plasma Research, Bhat, Gandhinagar, 382428 and Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742},
abstractNote = {In this paper, two mode-coupling analyses for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by drift waves are presented. The first approach is a coherent parametric process, which leads to a three-wave resonant interaction. This investigation allows for the drift waves and the GAMs to have comparable scales. The second approach uses the wave-kinetic equations for the drift waves, which then couples to the GAMs. This requires that the GAM scale length be large compared to the wave packet associated with the drift waves. The resonance conditions for these two cases lead to specific predictions of the radial wave number of the excited GAMs.},
doi = {10.1063/1.2732167},
journal = {Physics of Plasmas},
number = 5,
volume = 14,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}