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Stability of Externally Driven Magnetic Islands in a Helical Plasma

机译：螺旋等离子体中外部驱动的磁岛的稳定性

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Influence of external resonant magnetic perturbation (RMP) on a helical plasma is numerically investigated, using a set of reduced magnetohydrodynamic equations. Coexistence of the resistive interchange mode and RMP is simulated. In nonlinear simulations, saturated magnetic islands by the RMP typically show two states: oscillating small islands and locked large islands. In the former state, rotation of magnetic islands by neoclassical transport-driven poloidal flows disturbs growth of islands. On the other hand, in the latter state, locking of poloidal flows due to the RMP and growth of islands occur simultaneously. It is found that the curvature driven current enhances magnetic reconnection, and width of the large islands overcomes that of vacuum islands.
机译：使用一组简化的磁流体动力学方程，数值研究了外部共振磁扰动（RMP）对螺旋等离子体的影响。模拟了电阻互换模式和RMP的共存。在非线性模拟中，RMP产生的饱和磁岛通常显示两种状态：振荡小岛和锁定大岛。在前一种状态下，由新古典运输驱动的极向流引起的磁岛旋转扰乱了岛的生长。另一方面，在后者的状态下，由于RMP和岛的生长而引起的极向流的锁定同时发生。发现曲率驱动电流增强了磁连接，并且大岛的宽度克服了真空岛的宽度。

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