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Physics of Plasmas : Geodesic acoustic modes excited by finite beta drift waves

By N. Chakrabarti, P. N. Guzdar, R. G. Kleva, V. Naulin, J. J. Rasmussen et al.

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Book Id: WPLBN0002169635
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 25 November 2008

Title: Physics of Plasmas : Geodesic acoustic modes excited by finite beta drift waves  
Author: N. Chakrabarti, P. N. Guzdar, R. G. Kleva, V. Naulin, J. J. Rasmussen et al.
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Plasmas Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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P. N. Guzdar, R. G. Kleva, V. Naulin, J. J. Rasmussen Et Al, N. C. (n.d.). Physics of Plasmas : Geodesic acoustic modes excited by finite beta drift waves. Retrieved from http://www.worldjournal.org/


Description
Description: Presented in this paper is a mode-coupling analysis for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by finite beta drift waves. The finite beta effects give rise to a strong stabilizing influence on the parametric excitation process. The dominant finite beta effect is the combination of the Maxwell stress, which has a tendency to cancel the primary drive from the Reynolds stress, and the finite beta modification of the drift waves. The zonal magnetic field is also excited at the GAM frequency. However, it does not contribute to the overall stability of the three-wave process for parameters of relevance to the edge region of tokamaks.

 
 


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