Influence of resonant magnetic perturbation on a rotating helical plasma
Influence of resonant magnetic perturbation on a rotating helical plasma
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DOI：
10.1088/0741-3335/55/1/014013
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发表时间：
2012
影响因子：
2.2
通讯作者：
S. Nishimura;S. Toda;Y. Narushima;M. Yagi
中科院分区：
文献类型：
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作者：
S. Nishimura;S. Toda;Y. Narushima;M. Yagi
用包含新经典粘性的简化磁流体力学方程研究了具有共振磁扰动(RMP)的螺旋等离子体中磁岛的非线性稳定性。数值模拟了RMP驱动的孤岛和阻性交换模式的共存。观察到了新古典流对锁定磁岛的自愈作用。研究发现，曲率效应改变了自愈阈值，其中不利的曲率不仅驱动交换模式，而且还驱动曲率驱动的撕裂模式。为了理解模拟结果，还引入了一个基于卢瑟福方程和动量方程的分析模型。给出了考虑曲率效应的自愈准则。
Nonlinear stability of magnetic islands in a helical plasma with resonant magnetic perturbation (RMP) is investigated using reduced magnetohydrodynamic equations including neoclassical viscosity. Coexistence of RMP-driven islands and the resistive interchange mode is numerically simulated. The self-healing of locked magnetic islands by neoclassical flows is observed. It is found that the curvature effect modifies the threshold of the self-healing, where the unfavorable curvature drives not only the interchange mode but also the curvature-driven tearing mode. An analytical model based on a Rutherford equation with a momentum equation is also introduced to understand the simulation results. Criterion of the self-healing considering the curvature effect is newly obtained.