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Effect of resonant magnetic perturbations on local plasma current density gradients and neoclassical tearing modes

机译：谐振磁扰动对局部等离子体电流密度梯度和新古典撕裂模式的影响

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摘要

The effect of externally applied resonant magnetic perturbations (RMPs) on the local equilibrium plasma current density profile is studied numerically based on two-fluid equations in simplified cylindrical geometry. It is found that a moderate RMP below its penetration threshold, via non-linear mode coupling, induces a parallel electric field around its rational surface that can significantly change the local flux-surface-averaged current density gradient. At a given RMP amplitude, the modification of the current density profile increases with increasing electron temperature, and it significantly depends on the bi-normal electron fluid velocity at the resonant surface. The effect of this modification on the magnetic island growth is demonstrated by the example of small m/n = 2/1 islands (m/n being the poloidal/toroidal mode numbers), driven by an unfavorable plasma current density profile and bootstrap current perturbation. The 2/1 mode growth is stabilized by moderate static 4/2 or 6/3 RMPs if the local electron fluid velocity is in the ion drift direction or sufficiently large in the electron drift direction. These results reveal that a weakly three-dimensional equilibrium, containing a moderate 4/2 RMP and the associated shielding current, can be more stable against the 2/1 mode, which often causes tokamak plasma major disruptions.
机译：基于简化圆柱形几何形状的双流体方程，对外部施加的谐振磁扰动（RMP）对局部平衡等离子体电流密度分布的影响。结果发现，通过非线性模式耦合，在其穿透阈值以下的中等RMP引起并联电场围绕其合理表面围绕其可显着改变局部磁通表面平均电流密度梯度。在给定的RMP幅度下，随着电子温度的增加，电流密度轮廓的变形例，其显着取决于谐振表面处的双普正电子流体速度。通过小M / N = 2/1岛（M / N为单极/环形模式数）的示例来证明该修饰对磁岛生长的影响，由不利的等离子体电流密度曲线和自卷划电流扰动驱动。如果局部电子流体速度在离子漂移方向上或在电子漂移方向上足够大，则通过中等静态4/2或6/3 RMP稳定2/1模式生长。这些结果表明，含有中等4/2 RMP和相关屏蔽电流的弱三维平衡可以对2/1模式更稳定，这通常会导致Tokamak等离子体的主要破坏。

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