The linear MHD (magnetohydrodynamic) stability for high beta plasmas in the inward shifted Large Helical Device (LHD) configurations has been investigated for a wide range of magnetic Reynolds numbers $S$ using numerical simulations based on the kinetic MHD model with kinetic thermal ions where the beta is the ratio of the plasma pressure to the magnetic pressure. It is found that the dependence of the linear growth rate of the resistive ballooning modes on the $S$ number changes from $\unicode[STIX]{x1D6FE}\propto S^{-1/3}$ to $\unicode[STIX]{x1D6FE}\propto S^{-1}$ by the kinetic thermal ion effects so that the resistive ballooning modes are significantly suppressed as the $S$ number increases. For a high $S$ number comparable to experimental values, the most unstable modes are interchange modes. The kinetic thermal ion effects change the most unstable interchange mode from the ideal mode to the resistive mode. This transition of the interchange modes by kinetic thermal ion effects is consistent with the shift of the marginal stability boundary for the ideal interchange modes observed in the LHD experiments.

中文翻译：

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离子动力学对螺旋等离子体中线性压力驱动的磁流体动力学不稳定性的影响

已经针对各种磁雷诺数研究了向内偏移的大型螺旋器件 (LHD) 配置中高 β 等离子体的线性 MHD (磁流体动力学) 稳定性 $新元 使用基于具有动力学热离子的动力学 MHD 模型的数值模拟，其中 β 是等离子体压力与磁压力的比率。发现电阻气球模式的线性增长率与 $新元 数字从 $\unicode[STIX]{x1D6FE}\propto S^{-1/3}$ 到 $\unicode[STIX]{x1D6FE}\propto S^{-1}$ 通过动力学热离子效应，使得电阻气球模式被显着抑制，因为 $新元 数量增加。对于一个高 $新元 数与实验值相当，最不稳定的模式是交换模式。动力学热离子效应将最不稳定的交换模式从理想模式变为电阻模式。这种由动力学热离子效应引起的交换模式转变与在 LHD 实验中观察到的理想交换模式的边际稳定性边界的移动是一致的。