Geometry dependence of the fluctuation intensity in gyrokinetic turbulence
Geometry dependence of the fluctuation intensity in gyrokinetic turbulence
复制标题
回旋湍流波动强度的几何依赖性
DOI：
10.1088/1361-6587/abc861
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发表时间：
2020
影响因子：
2.2
通讯作者：
B. Patel
中科院分区：
文献类型：
--
作者：
G. Staebler;J. Candy;E. Belli;J. Kinsey;N. Bonanomi;B. Patel
本文研究了回旋湍流模拟中三维电势饱和涨落强度的性质。通量面伸长和Shafranov位移的扫描用于分离托卡马克几何依赖性。为了计算精确的通量所需的潜在的强度由一个准线性的方法确定使用线性本征模计算与gyrokinetic代码。这种非线性强度的模型构造使用的线性本征模的属性和几何形状函数从三维强度谱。该模型计算的极向波数谱的电子和离子的能量通量与前所未有的准确性。通过控制湍流谱的径向波数宽度，获得了新的见解到纬向流混合饱和离子尺度湍流的方式。
The findings of an investigation into the properties of the three dimensional (3D) saturated fluctuation intensity of the electric potential in gyrokinetic turbulence simulations is presented. Scans in flux surface elongation and Shafranov shift are used to isolate the tokamak geometric dependencies. The potential intensity required in order to compute exact fluxes by a quasilinear method is determined using linear eigenmodes computed with the gyrokinetic code. A model of this non-linear intensity is constructed using the linear eigenmode properties and the geometry shape functions obtained from the 3D intensity spectrum. The model computes the poloidal wavenumber spectrum of the electron and ion energy fluxes with unprecedented accuracy. New insights are gained into the way zonal flow mixing saturates ion-scale turbulence by controlling the radial wavenumber width of the turbulence spectrum.