| Eigenmode analysis of geodesic acoustic modes | |
| Gao, Zhe ; Itoh, K. ; Sanuki, H. ; Dong, J. Q. | |
| 2010-05-10 ; 2010-05-10 | |
| 关键词 | ZONAL FLOWS TOKAMAK PLASMAS POLOIDAL ROTATION TOROIDAL PLASMAS DRIFT WAVES OSCILLATIONS EXCITATION TURBULENCE DYNAMICS JFT-2M Physics, Fluids & Plasmas |
| 中文摘要 | Geodesic acoustic modes (GAMs) are studied as plasma eigenmodes when an electrostatic potential nearly constant around a magnetic surface is applied to collisionless toroidal plasmas. Besides the standard GAM, a branch of low frequency mode and an infinite series of ion sound wavelike modes are identified. Eigenfrequencies of these modes are obtained analytically and numerically from a linear gyrokinetic model. The finite gyroradius effect is found to enhance the collisionless damping of the standard GAM, while this enhancement is not monotonic as the safety factor varies. Moreover, additional damping due to higher-harmonic resonances becomes important when the safety factor increases. The mode structure of the GAM is also discussed. (c) 2008 American Institute of Physics. |
| 语种 | 英语 ; 英语 |
| 出版者 | AMER INST PHYSICS ; MELVILLE ; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/22300]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | Gao, Zhe,Itoh, K.,Sanuki, H.,et al. Eigenmode analysis of geodesic acoustic modes[J],2010, 2010. |
| APA | Gao, Zhe,Itoh, K.,Sanuki, H.,&Dong, J. Q..(2010).Eigenmode analysis of geodesic acoustic modes.. |
| MLA | Gao, Zhe,et al."Eigenmode analysis of geodesic acoustic modes".(2010). |
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