Stellarator Turbulence: Subdominant Eigenmodes and Quasilinear Modeling.
Stellarator Turbulence: Subdominant Eigenmodes and Quasilinear Modeling.
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仿星器湍流：次主导本征模态和拟线性建模。
DOI：
10.1103/physrevlett.116.085001
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发表时间：
2016
影响因子：
8.6
通讯作者：
D. Hatch
中科院分区：
文献类型：
--
作者：
M. Pueschel;B. Faber;J. Citrin;C. Hegna;P. Terry;D. Hatch
由于复杂的几何形状，仿星器几何结构中的回旋运动模拟会产生大量次主导的不稳定和稳定、近正交的本征模。在这里，首次提出了基于仿星器几何中完整本征模谱的结果。在低磁剪切离子温度梯度驱动情况的非线性状态下，多种模式处于活动状态并对系统产生影响。因此，除了电子频率下的非线性、窄特征之外，湍流频谱也是宽带的。结果表明，在仿星器中成功的拟线性、混合长度传输建模是可能的，其中必须考虑所有次要的不稳定模式。
Owing to complex geometry, gyrokinetic simulations in stellarator geometry produce large numbers of subdominant unstable and stable, near-orthogonal eigenmodes. Here, results based on the full eigenmode spectrum in stellarator geometry are presented for the first time. In the nonlinear state of a low-magnetic-shear ion-temperature-gradient-driven case, a multitude of these modes are active and imprint the system. Turbulent frequency spectra are broadband as a consequence, in addition to a nonlinear, narrow signature at electron frequencies. It is shown that successful quasilinear, mixing-length transport modeling is possible in stellarators, where it is essential to account for all subdominant unstable modes.