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 |
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論文番号 | 022306 |
ジャーナル | Physics of Plasmas |
巻 | 16 |
号 | 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