托卡马克等离子体团形成对锯齿过程的影响
Effects of Plasmoid Formation on Sawtooth Process in a Tokamak
摘要：
对于实际的Lundquist数，1/1磁岛导致次级薄电流片的形成，它分裂成一系列小磁岛，称为等离子体团。等离子体团动力学在核聚变等离子体重联过程中的作用仍然是一个悬而未决的问题。在这项研究中，系统的模拟进行调查的电阻内部扭结模式使用全电阻MHD方程实现的NIMROD代码在一个简化的托卡马克几何。对于Lundquist数$S\ge1.6\times10^7$，次级电流片被发现是不稳定的等离子体团在非线性电阻扭结模式的演变与临界纵横比的电流片的~70。小等离子体团的合并导致了一个怪物等离子体团的形成，可以显着影响主岛的演化。这可能为在超导实验中观察到的部分重联提供了一个解释。
英文摘要：
For realistic values of Lundquist number in tokamak plasmas, the 1/1 magnetic island leads to the formation of secondary thin current sheet, which breaks up into a chain of small magnetic islands, called plasmoids. The role of plasmoid dynamics during the sawtooth reconnection process in fusion plasmas remains an unresolved issue. In this study, systematic simulations are performed to investigate the resistive internal kink mode using the full resistive MHD equations implemented in the NIMROD code in a simplified tokamak geometry. For Lundquist number $S\ge1.6\times10^7$, secondary current sheet is found to be unstable to plasmoids during the nonlinear resistive kink mode evolution with a critical aspect ratio of the current sheet of ~70. The merging of small plasmoids leads to the formation of a monster plasmoid that can significantly affect the primary island evolution. This may provide an explanation for the partial reconnection observed in sawtooth experiments.
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