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Behaviour of turbulent transport in the vicinity of a magnetic island

机译:磁岛附近的湍流传输行为

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摘要

The influence of a static magnetic island on the behaviour of the electrostatic turbulence in a tokamak is investigated numerically employing global nonlinear gyrokinetic particle-in-cell simulations. The excitation of turbulence is modified by the magnetic topology of the island. Low mode numbers in the energy spectrum of the potential disturbances, corresponding to the island perturbation, are amplified by nonlinear coupling with the microinstabilities, particularly in the presence of strong turbulence. The associated large-scale flows affect the transport directly and through strain of small-scale eddies. The temperature profile determined numerically in the island region agrees qualitatively with analytic estimates; however, quantitative discrepancies are found.
机译:静态磁岛对托卡马克中的静电湍流的行为的影响进行了数值模拟,使用了全局非线性回旋动力学单元内粒子模拟。湍流的激发通过岛的磁拓扑来改变。潜在干扰能谱中的低模数(对应于孤岛扰动)通过与微不稳定性的非线性耦合而被放大,特别是在存在强湍流的情况下。相关的大流量直接影响运输,并通过小涡流的应变而影响运输。在岛区数值确定的温度曲线定性与解析估计相符。但是,发现了数量上的差异。

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