发表机构
Institute for Plasma Research; ITER-India, Institute for Plasma Research; Homi Bhabha National Institute（等离子体研究所; 印度国际热核聚变实验堆计划，等离子体研究所; 霍米·巴巴国立研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文用三维电磁流体模型研究ELM丝状体非线性合并，发现密度扰动调节磁重联率与晃动幅度，确立其为额外控制参数。
AI 中文摘要
我们使用三维电磁流体模型研究了两个载流ELM丝状体的非线性合并。在平坦密度极限下，合并表现出类似磁岛的磁重联，其特征为X点形成、电流片发展和类似Sweet-Parker的电阻标度。引入团块状密度扰动会改变重联动力学：对于弱扰动，峰值重联率几乎保持不变，但对于较大密度振幅，峰值重联率降低且越来越延迟。对感应方程的分析揭示了从电阻动力学向越来越依赖密度的平流动力学的转变。有限的密度扰动还增强了丝状体压缩后的回弹或晃动。晃动幅度随密度梯度压力力的增加而增加，确立了密度扰动作为重联和丝状体晃动的额外控制参数。这些结果突出了控制托卡马克边缘ELM丝状体非线性演化的电磁和压力驱动耦合动力学。
英文摘要
We investigate the nonlinear coalescence of two current-carrying ELM filaments using a three-dimensional electromagnetic fluid model. In the flat-density limit, the coalescence exhibits magnetic island-like reconnection, characterized by X-point formation, current-sheet development, and Sweet-Parker-like resistive scaling. Introducing a blob-like density perturbation modifies the reconnection dynamics: while the peak reconnection rate remains nearly unchanged for weak perturbations, it decreases and is increasingly delayed for larger density amplitudes. Analysis of the induction equation reveals a transition from resistive to increasingly density-dependent advective dynamics. Finite density perturbations also enhance the post-compression rebound, or sloshing, of the filaments. The sloshing amplitude increases with the density-gradient pressure force, establishing density perturbation as an additional control parameter for both reconnection and filament sloshing. These results highlight the coupled electromagnetic and pressure-driven dynamics governing the nonlinear evolution of ELM filaments in the tokamak edge.
