Excitation of zonal flow by drift waves in toroidal plasmas
Excitation of zonal flow by drift waves in toroidal plasmas
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DOI：
10.1063/1.874222
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发表时间：
2000-08-01
影响因子：
2.2
通讯作者：
White, R
中科院分区：
文献类型：
--
作者：
Chen, L;Lin, ZH;White, R
解析色散关系的推导表明，在环形等离子体中，带状流可以通过调制在一个单一的n相干漂移波的径向包络自发地激发，与n的环形模数。预测的不稳定性特征进行了验证的离子温度梯度模式的三维全球gyrokinetic模拟。模式振幅的非线性方程表现出饱和的线性不稳定的泵波和漂移波强度和纬向流的非线性振荡，与参数相关的周期加倍路线的混乱。(C)2000年美国物理学会。【S1070-664X（00）01208-8】。
An analytical dispersion relation is derived which shows that, in toroidal plasmas, zonal flows can be spontaneously excited via modulations in the radial envelope of a single-n coherent drift wave, with n the toroidal mode number. Predicted instability features are verified by three-dimensional global gyrokinetic simulations of the ion-temperature-gradient mode. Nonlinear equations for mode amplitudes demonstrate saturation of the linearly unstable pump wave and nonlinear oscillations of the drift-wave intensity and zonal flows, with a parameter-dependent period doubling route to chaos. (C) 2000 American Institute of Physics. [S1070-664X(00)01208-8].