论文标题
通过中等规模的环形电子温度梯度湍流激发纬向流动的激发
Excitation of Zonal Flow by Intermediate-Scale Toroidal Electron Temperature Gradient Turbulence
论文作者
论文摘要
我们表明，通过中间尺度的环形电子温度梯度（ETG）在Tokamak等离子体中，可以优先激发Zonal流动。先前得出相反结论的理论研究假设ETG模式的流体近似。在这里，我们进行了陀螺仪分析，该分析最终产生了具有Navier-Stokes型非线性的ETG动力学的非线性Schrödinger方程。对于典型的Tokamak参数，发现区域流量产生在中等规模的ETG湍流中起重要作用。这一发现为最近的多尺度陀螺仪模拟提供了解释。
We show that zonal flow can be preferentially excited by intermediate-scale toroidal electron temperature gradient (ETG) turbulence in tokamak plasmas. Previous theoretical studies that yielded an opposite conclusion assumed a fluid approximation for ETG modes. Here, we carry out a gyrokinetic analysis which ultimately yields a nonlinear Schrödinger equation for the ETG dynamics with a Navier-Stokes type nonlinearity. For typical tokamak parameters, it is found that zonal flow generation plays an important role in the intermediate-scale ETG turbulence. This finding offers an explanation for recent multi-scale gyrokinetic simulations.
