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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Influence of asymmetric magnetic perturbation on the nonlinear evolution of double tearing modes
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Influence of asymmetric magnetic perturbation on the nonlinear evolution of double tearing modes

机译：不对称磁扰动对双撕裂模式非线性演化的影响

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摘要

The effects of asymmetric magnetic perturbation on the triggering and evolution of double tearing modes (DTMs) are investigated using nonlinear magnetohydrodynamics simulations in a slab geometry. We find that for reversed magnetic shear plasmas the resistive reconnection process induced by the initial perturbation at one rational surface can drive a new island at the other rational surface with the same mode number. The four typical states of the mode for the time evolution are found, and include: (i) a linear growth stage; (ii) a linear/nonlinear stable stage; (iii) an interactively driving stage; and (iv) a symmetric DTM stage. These differ from previous simulation results. Moreover, nonlinear DTM growth is found to strongly depend on the asymmetric magnetic perturbation, particularly in the early nonlinear phase. The initial perturbation strength scale of island width suggests that the left island enters into a Sweet-Parker growth process when the right island is sufficiently large to effectively drive the other. These results predict that although externally applied magnetic perturbations can suppress the neoclassical tearing mode they can also trigger new instabilities such as asymmetric DTMs.
机译：使用非线性磁流体模拟在板状几何中的非线性磁流体模拟研究了不对称磁扰动对双撕裂模式（DTMS）的触发和演化的影响。我们发现，对于逆转的磁剪切等离子体，由一个理性表面的初始扰动引起的电阻重新连接过程可以在与相同的模式编号中驱动另一个合理表面的新岛。找到时间进化模式的四种典型状态，包括：（i）线性生长阶段; （ii）线性/非线性稳定阶段; （iii）交互式驾驶阶段; （iv）对称DTM阶段。这些与以前的仿真结果不同。此外，发现非线性DTM生长强烈取决于不对称磁性扰动，特别是在早期的非线性相中。岛宽的初始扰动强度等图认为，当右岛足够大以有效地驱动另一个岛屿时，左岛进入甜帕克的生长过程。这些结果预测，尽管外部施加的磁性扰动可以抑制新古典撕裂模式，但它们也可以触发新的不稳定性，例如不对称的DTM。

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