Critically Balanced Ion Temperature Gradient Turbulence in Fusion Plasmas
Critically Balanced Ion Temperature Gradient Turbulence in Fusion Plasmas
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DOI：
10.1103/physrevlett.107.115003
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发表时间：
2011-09-08
影响因子：
8.6
通讯作者：
Schekochihin, A. A.
中科院分区：
文献类型：
--
作者：
Barnes, M.;Parra, F. I.;Schekochihin, A. A.
导出了磁化环形等离子体中离子温度梯度驱动湍流的标度律，并与直接数值模拟进行了比较。湍流波动幅度，空间尺度，并由此产生的热通量的温度梯度和磁场线间距的预测依赖关系被发现同意在驾驶和惯性范围内的数值结果。证据提供支持的临界平衡猜想，平行流和非线性垂直去相关时间是可比的，在所有的空间尺度，导致平行和垂直的空间尺度之间的缩放关系。这表明，即使是强磁化等离子体湍流本质上是三维的。
Scaling laws for ion temperature gradient driven turbulence in magnetized toroidal plasmas are derived and compared with direct numerical simulations. Predicted dependences of turbulence fluctuation amplitudes, spatial scales, and resulting heat fluxes on temperature gradient and magnetic field line pitch are found to agree with numerical results in both the driving and inertial ranges. Evidence is provided to support the critical balance conjecture that parallel streaming and nonlinear perpendicular decorrelation times are comparable at all spatial scales, leading to a scaling relationship between parallel and perpendicular spatial scales. This indicates that even strongly magnetized plasma turbulence is intrinsically three dimensional.