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首页> 外文期刊>Plasma physics and controlled fusion >Effects of equilibrium radial electric field on ion temperature gradient instability in the scrape-off layer of a field-reversed configuration
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Effects of equilibrium radial electric field on ion temperature gradient instability in the scrape-off layer of a field-reversed configuration

机译：平衡径向电场对现场反转配置刮削层中离子温度梯度不稳定性的影响

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摘要

Linear and nonlinear effects of the equilibrium radial electric field on the ion temperature gradient (ITG) instability in the scrape-off layer (SOL) of a field-reversed configuration have been studied using gyrokinetic particle simulations for a single toroidal mode. Linear simulations with adiabatic electrons find that the ExB flow shear reduces the growth rate and causes a radial tilting of the mode structure on the toroidal plane. Nonlinear simulations find that the ExB flow shear significantly decreases ITG saturation amplitude and ion heat transport in the SOL by reducing both turbulence intensity and eddy size. The turbulence intensity is determined by fluid eddy rotation, which is the dominant saturation mechanism for the SOL ITG instability with a single toroidal mode number. On the other hand, parallel wave-particle decorrelation is the dominant mechanism for the SOL ITG turbulent transport. A random walk model using the guiding center radial excursion as the characteristic length scale and the eddy turnover time as the characteristic time scale fits very well to the scaling of ion heat conductivity with the ExB flow shear.
机译：用回旋动力学粒子模拟方法研究了平衡径向电场对场反转结构刮除层（SOL）中离子温度梯度（ITG）不稳定性的线性和非线性影响。绝热电子的线性模拟发现，ExB流剪切降低了生长速率，并导致环形平面上模式结构的径向倾斜。非线性模拟发现，ExB流剪切通过降低湍流强度和涡流大小，显著降低了ITG饱和振幅和溶胶中的离子热输运。湍流强度由流体涡流旋转决定，这是单环模数SOL ITG不稳定性的主要饱和机制。另一方面，平行波粒解相关是溶胶-凝胶湍流输运的主要机制。以导向中心径向偏移为特征长度标度，以涡流翻转时间为特征时间标度的随机游动模型与ExB流动剪切的离子热导率标度非常吻合。

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