Penetration properties of applied resonant magnetic perturbation in HL-2A tokamak
Penetration properties of applied resonant magnetic perturbation in HL-2A tokamak
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DOI：
10.1088/1741-4326/aceb77
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发表时间：
2023-07
期刊：
影响因子：
3.3
通讯作者：
Xin Eric Wang;Haowei Zhang;Wenjin Chen;T. Sun;Wei Zhang;Zhiwei Ma
中科院分区：
文献类型：
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作者：
Xin Eric Wang;Haowei Zhang;Wenjin Chen;T. Sun;Wei Zhang;Zhiwei Ma
在托卡马克中，磁场分界线上的任意扰动都会引起一种称为同宿纠缠的结构。边缘局域模（ELM）和共振磁扰动（RMP）都可以导致分界线上的磁场扰动。在适当的情况下，RMP可以缓解甚至完全抑制ELM的快速崩溃过程。用CLTx程序（带刮去层的三维磁流体程序的扩展版本）模拟HL-2A装置中RMP产生的具有边界随机区的同宿纠缠结构。具有同宿纠缠的强扭曲磁力线可以连接到托卡马克偏滤器。这些磁力线在偏滤器上的足迹与实验中的能量存款斑点一致。从逃逸磁力线的庞加莱图，它被发现，这些磁力线穿透的等离子体边缘区域的深度取决于RMP线圈电流，RMP场的旋转频率，和等离子体电阻率。
Any arbitrary perturbation on a magnetic field separatrix can cause a structure named homoclinic tangle in tokamaks. Both an edge localized mode (ELM) and a resonant magnetic perturbation (RMP) can lead to a perturbation of the magnetic field on the separatrix. Under the appropriate circumstances, RMP could alleviate or even completely suppress a rapid collapse process of an ELM. The simulation results using the CLTx code, the extended version of the three-dimensional toroidal magnetohydrodynamic (MHD) code (CLT (Ci-Liu-Ti, which means MHDs in Chinese)) with a scrape-off layer, show the structure of the homoclinic tangle with a borderline stochastic region resulting from RMP in HL-2A tokamak. Strongly distorted magnetic field lines with the homoclinic tangle could connect to the tokamak divertors. The footprints of these magnetic field lines on the divertors are consistent with the energy deposit spots in the experiment. From Poincaré plots of escaped magnetic field lines, it is found that the depth of the plasma edge region penetrated by these field lines depends on the RMP coil current, the rotation frequency of the RMP field, and the plasma resistivity.