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Transient excitation of zonal flows by geodesic acoustic modes

机译：测地声模式对地带流的瞬态激发

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摘要

Zonal flows (ZFs) are excited transiently by geodesic acoustic modes (GAMs) in toroidal plasmas. When GAMs have radially inward and outward propagating components, these components interact to excite the zero frequency modes (ZFs) transiently, in addition to exciting higher harmonics of GAM. A fluid model is used to study this transient excitation. The Reynolds stress is evaluated from the action conservation equation, and a set of equations to analyze nonlinear couplings among GAMs and ZFs is derived. GAMs are driven by the drift wave (DW) turbulence, and ZFs are transiently driven by nonlinear self-interaction of GAMs. The dependences of the peak amplitudes of ZFs on coupling coefficients are explained theoretically. A new energy path from the DW turbulence to ZFs is found under a situation in which there is only energy transfer from the DW turbulence to GAMs.
机译：在环流等离子体中，测地线声模（GAM）瞬时激发了带状流（ZF）。当GAM具有径向向内和向外传播的分量时，这些分量相互作用，除了会激发GAM的高次谐波外，还会瞬态地激发零频率模式（ZF）。流体模型用于研究这种瞬态激励。从动作守恒方程评估雷诺应力，并推导出一组用于分析GAM和ZF之间的非线性耦合的方程。 GAM由漂移波（DW）湍流驱动，而ZF由GAM的非线性自交互作用瞬态驱动。理论上解释了ZF的峰值幅度对耦合系数的依赖性。在只有能量从DW湍流转移到GAM的情况下，找到了从DW湍流到ZF的新能量路径。

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