Effect of resonant magnetic perturbations with plasma response on particle orbit characters
Effect of resonant magnetic perturbations with plasma response on particle orbit characters
复制标题
等离子体响应的共振磁扰动对粒子轨道特性的影响
DOI：
10.1088/1402-4896/abd905
复制
发表时间：
2021
期刊：
影响因子：
2.9
通讯作者：
Changjian Tang
中科院分区：
文献类型：
--
作者：
Chunyan Su;Shaoyong Chen;Maolin Mou;Wenping Guo;Xieyu Chen;Changjian Tang
摘要：基于HL - 2A托卡马克参数，利用全轨道程序对考虑等离子体响应的共振磁扰动（RMP）场中的离子轨道进行了数值研究。结果表明，与真空RMP场相比，考虑等离子体响应的RMP能引起更显著的径向轨道扩张。进一步研究表明，轨道扩张的物理机制与共振场放大（RFA）效应有关。当离子穿过扰动场被强烈放大的区域时，通行轨道的扩张变得非常大。同时，被俘获轨道的扩张由相应轨道经过处的扰动场平均值决定。这表明等离子体对RMP的响应在改变离子轨道特性方面起着重要作用，它可导致快离子的重新分布，从而为实验中血浆约束的退化提供了一种可能的机制。
注：原文中“plasma”常见意思是“等离子体”，最后一句翻译为“血浆”可能是笔误，需根据实际情况确定是否需要修改。
The ion orbits considering the resonant magnetic perturbation (RMP) fields with plasma response are studied numerically using the full orbit code based on HL-2A tokamak parameters. The results show that RMP with plasma response can cause a more significant radial orbit expansion than the vacuum RMP field. Further study exhibits that the physical mechanism of the orbit expansion relates to the resonant field amplification (RFA) effect. The passing orbits expansion become quite large when ions pass through the region where the perturbed field is strongly amplified. Meanwhile, the trapped orbits expansion is determined by the average value of the perturbed field where corressponding orbit goes by. This indicates that the plasma response to RMP plays an important role in changing the characteristics of ion orbits, which can lead to a redistribution of fast ions and thus providing a possible mechanism for the degradation of plasma confinements in experiments.