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Gyrokinetic Simulations of Slab Ion Temperature Gradient Turbulence with Kinetic Electrons

机译：动力学电子对平板离子温度梯度湍流的运动学模拟

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摘要

Ion temperature gradient (ITG) driven turbulence is investigated by means of gyrokinetic simulations which include both kinetic ions and electrons in slab geometry with uniform equilibrium magnetic field. The study confirms that numerical results satisfy the entropy balance equation including both ions and electrons. The entropy variable is transferred from ions to electrons through the perturbation of electrostatic potential, and the transferred fluctuation is diffused by the electron collision dissipation. In the ITG turbulence with kinetic electrons ion heat diffusion is larger than that with adiabatic electrons. The former is close to the latter when the ion mass is comparable to or larger than the hydrogen one. The difference between the transport coefficients does not originate from the suppression of turbulence by zonal flow, but stems from the difference between their spectra. The lowest wavenumber mode dominates the coefficient in the adiabatic electron case, while the transport is caused not only by the the lowest mode but by higher wavenumbers in the kinetic electron cases.
机译：通过陀螺动力学模拟研究了离子温度梯度（ITG）驱动的湍流，其中包括平板几何形状中具有均匀平衡磁场的动离子和电子。研究证实，数值结果满足包括离子和电子在内的熵平衡方程。熵变量通过静电势的扰动从离子转移到电子，并且转移的波动通过电子碰撞耗散而扩散。在具有动能电子的ITG湍流中，离子的热扩散大于具有绝热电子的湍流。当离子质量等于或大于氢原子时，前者接近后者。输运系数之间的差异并非源于地带流动对湍流的抑制作用，而是源于其频谱之间的差异。在绝热电子情况下，最低波数模式占主导地位，而在动能电子情况下，传输不仅由最低模式引起，而且由较高波数引起。

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