Nonlinear self-interaction of geodesic acoustic modes in toroidal plasmas

M. Sasaki, K. Itoh, Y. Nagashima, A. Ejiri, Y. Takase

研究成果: ジャーナルへの寄稿学術誌査読

20 被引用数 (Scopus)

抄録

A self-nonlinear process involving the geodesic acoustic mode (GAM) was analyzed. GAMs nonlinearly excite higher harmonics as quasimodes. In the fluid picture, the Reynolds stress is modeled by the drift wave action. Other nonlinear terms such as the coupling between parallel velocity and vorticity, and between density and vorticity, were also considered, and evaluated using linear eigenmodes. We considered nonlinearities up to the third order. Analytic expressions for the amplitude of the second harmonic GAM and the saturation level of the fundamental GAM were derived. The validity of the theory is discussed based on a comparison of experimental results with theoretical predictions.

本文言語英語
論文番号022306
ジャーナルPhysics of Plasmas
16
2
DOI
出版ステータス出版済み - 2009
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 凝縮系物理学

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