Nonlinear excitation of zonal flows by turbulent energy flux,Physical Review E

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Nonlinear excitation of zonal flows by turbulent energy flux
Physical Review E ( IF 2.2 ) Pub Date : 2022-09-13 , DOI: 10.1103/physreve.106.035205
Zihao Wang ₁ , Zongliang Dai ₁ , Shaojie Wang ₁

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The nonlinear excitation of zonal flows (ZFs) generated by the ion-temperature-gradient turbulence in a tokamak plasma is investigated by using the global gyrokinetic code nlt. It is found that ZFs are initially driven by the nonlinear self-interaction of the eigenmode. In the nonlinear saturation, the modulational instability becomes important, and its contribution to ZFs can finally be comparable to that of the self-interaction mechanism. More importantly, both types of nonlinear wave-wave interactions can be well described by the turbulent energy flux model.

中文翻译：

湍流能量流对纬向流的非线性激励

使用全局旋动代码nlt研究了托卡马克等离子体中离子-温度-梯度湍流产生的纬向流（ZFs）的非线性激发。发现 ZF 最初是由本征模的非线性自相互作用驱动的。在非线性饱和中，调制不稳定性变得很重要，它对 ZF 的贡献最终可以与自相互作用机制的贡献相媲美。更重要的是，这两种非线性波波相互作用都可以用湍流能量通量模型很好地描述。

更新日期：2022-09-14

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