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arXiv 0904.3873physics.plasm-phphysics.comp-phphysics.flu-dyn
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测地声学模式的径向传播

Radial propagation of geodesic acoustic modes

Robert Hager, Klaus Hallatschek

摘要:

GAM群速度的估计从径向自由能通量的比率,总的自由能应用回旋和双流体理论。这种方法比直接计算群速度的方法更鲁棒,并且可以推广到包括额外的物理学,例如磁几何学。用陀螺动力学程序GYRO [J. Candy和R. E. Waltz,J. Comp. Phys. 186,pp. 545-581(2003)]、双流体代码NLET [K. Hallatschek和A. Zeiler,Physics of Plasmas 7,pp. 2554-2564(2000)]和分析计算。在讨论实验观察到的GAM活动的窗口以及线性理论和实验GAM频率之间的匹配时,必须记住GAM传播。

英文摘要:

The GAM group velocity is estimated from the ratio of the radial free energy flux to the total free energy applying gyrokinetic and two-fluid theory. This method is much more robust than approaches that calculate the group velocity directly and can be generalized to include additional physics, e.g. magnetic geometry. The results are verified with the gyrokinetic code GYRO [J. Candy and R. E. Waltz, J. Comp. Phys. 186, pp. 545-581 (2003)], the two-fluid code NLET [K. Hallatschek and A. Zeiler, Physics of Plasmas 7, pp. 2554-2564 (2000)], and analytical calculations. GAM propagation must be kept in mind when discussing the windows of GAM activity observed experimentally and the match between linear theory and experimental GAM frequencies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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