arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2604.03089physics.plasm-ph
收藏

有限离子温度对托卡马克边缘区域电流承载ELM丝状体合并的影响

Finite Ion Temperature Effects on the Merging of Current-Carrying ELM Filaments in the edge region of a tokamak

Institute for Plasma Research(等离子体研究所);ITER-India, Institute for Plasma Research(印度国际热核聚变实验堆计划,等离子体研究所);Homi Bhabha National Institute(霍米·巴巴国立学院)

Souvik Mondal, Nirmal Bisai, Abhijit Sen, Indranil Bandyopadhyay

AI总结:

本文研究了有限离子温度对托卡马克边缘区域电流承载ELM丝状体动态的影响,发现离子温度升高会改变丝状体传播和相互作用,导致合并延迟,同时揭示了离子温度对边缘等离子体输运的重要性。

摘要:

边缘局域化模式(ELM)丝状体对托卡马克边缘的跨场输运至关重要;然而,其动态通常使用冷离子近似分析,尽管实验数据表明Ti~Te。本研究采用标准化三维流体模型,研究有限离子温度对单向电流承载ELM样丝状体动态的影响。我们证明,增加离子温度显著改变丝状体传播和相互作用,尽管总动能因压力梯度驱动增强,但丝状体合并仍被延迟。单丝状体动态分析表明,有限离子温度产生不对称电势结构、强环向流动和持续旋转运动,将动能从径向传播转化为涡旋动力学。对离子-电子温度比的全面考察揭示了从径向主导到旋转主导行为的明显转变。这些结果为暖离子域中减少径向输运和延迟合并提供了统一的物理解释,强调了在ELM丝状体动态和边缘等离子体输运建模中纳入离子温度效应的必要性。

英文摘要:

Edge-localized-mode (ELM) filaments are crucial for cross-field transport at the tokamak edge; yet, their dynamics are often analyzed using the cold-ion approximation, despite experimental data indicating that Ti~Te . This study employs a normalized three-dimensional fluid model to investigate the influence of finite ion temperature on the dynamics of unidirectional current-carrying ELM-like filaments. We demonstrate that increasing ion temperature substantially alters filament propagation and interaction, resulting in a delay of filament merging despite an increase in total kinetic energy due to a stronger pressure-gradient drive. The examination of single-filament dynamics indicates that finite ion temperature generates asymmetric potential structures, strong poloidal flows, and persistent rotational motion, which channel kinetic energy from radial propagation into vortical dynamics. A comprehensive examination of the ion-to-electron temperature ratio reveals a distinct transition from radially dominated to rotation-dominated behavior as ion temperature increases. These results provide a unified physical explanation for reduced radial transport and delayed merging in the warm-ion domain, emphasizing the necessity of incorporating ion temperature effects in the modeling of ELM filament dynamics and edge plasma transport.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑