AI 中文总结
研究利用简化电磁流体模型探究载流ELM细丝非线性动力学，发现平行电流抑制其径向速度，改变电流源结构致螺旋涡度等，使细丝从传播态转为旋转自组织电磁结构，为ELM细丝动力学提供新见解。
AI 中文摘要
在这项工作中，我们使用平板几何中的简化电磁流体模型研究孤立的载流边缘局域模（ELM）细丝的非线性动力学。数值模拟表明，单向平行电流通过削弱曲率驱动的交换力，显著抑制径向细丝速度并降低向外传播速度。径向速度的降低遵循修正的标度关系，表明电流增加会逐渐削弱细丝向外传播。对涡度方程的分析表明，电磁电流源从偶极结构转变为显著的螺旋模式，并在非线性阶段克服了传统的曲率驱动。这种电流驱动源直接将其拓扑结构印在涡度场上，导致螺旋涡度、角动量增加、旋转能量增加和局部剪切层。因此，细丝经历了从传统传播状态到旋转自组织电磁结构的转变。这些发现表明平行电流作为一种有效的电磁涡度源，为托卡马克边缘等离子体中ELM细丝的非线性动力学提供了新的见解。
英文摘要
In this work, we investigate the nonlinear dynamics of isolated current-carrying edge-localized mode (ELM) filaments using a reduced electromagnetic fluid model in slab geometry. Numerical simulations show that unidirectional parallel current significantly suppresses radial filament velocity and reduces the outward propagation velocity by weakening the curvature-driven interchange force. The reduction in radial velocity is found to follow a modified scaling relation, demonstrating that increasing current progressively weakens outward filament propagation. Analysis of the vorticity equation shows that the electromagnetic current source changes from a dipolar structure to a remarkable spiral pattern, and overcomes the conventional curvature drive in the nonlinear phase. This current-driven source directly imprints its topology on the vorticity field, resulting in spiral vorticity, enhanced angular momentum, increased rotational energy, and localized shear layers. The filament therefore undergoes a transition from a conventional propagating state to a rotationally self-organized electromagnetic structure. These findings demonstrate that parallel current acts as an effective electromagnetic vorticity source and provides new insight into the nonlinear dynamics of ELM filaments in tokamak edge plasmas.
