Nonlinear excitation of geodesic acoustic modes by drift waves

Chakrabarti, N. ; Singh, R. ; Kaw, P. K. ; Guzdar, P. N. (2007) Nonlinear excitation of geodesic acoustic modes by drift waves Physics of Plasmas, 14 (5). 052308_1-052308_6. ISSN 1070-664X

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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.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:25235
Deposited On:06 Dec 2010 13:42
Last Modified:03 Jun 2011 15:00

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