Nonlinear modeling of ELM mitigation with RMP on HL-2A

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Lian Wang, G. Hao, Marina Becoulet, Yueqiang Liu, Yuhong Xu, Jiquan Li, Pengfei Zheng, D. Hu, Shilin Hu, Guanqi Dong, Shuo Wang, Xiaoxue He, Tengfei Sun, Guido Huijsmans, Wulyu Zhong
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引用次数: 0

Abstract

Nonlinear modeling of mitigation of the edge localized mode (ELM) with resonant magnetic perturbation (RMP) is performed for the HL-2A tokamak, utilizing the three-dimensional (3D) magnetohydrodynamic (MHD) code JOREK. Based on the 3D equilibrium established after application of the n=1 (n is the toroidal mode number) RMP at 4.9 kAt coil current with odd parity, ELM mitigation is successfully simulated consistent with the experimental result. Nonlinear simulations show strong mode coupling among toroidal Fourier harmonics, allowing redistribution of the magnetic energy such that the most unstable toroidal mode saturates at a lower level. This magnetic energy cascade offers an explanation of the RMP-induced ELM mitigation achieved in HL-2A. Detailed examination of the simulation results shows persistent resonant field screening even during the ELM mitigation phase. Finite plasma resistivity however does enable partial penetration of the resonant field thus modifying the edge magnetic topology and characteristics of the edge transport. Plasma radial profiles undergo pronounced changes around the pedestal region, when the magnetic energy of the most unstable toroidal mode reaches the maximum value. Systematic scans of the applied RMP coil current with the JOREK simulations find a threshold value of around 4.5 kAt required for achieving the ELM mitigation on HL-2A.
在 HL-2A 上利用 RMP 进行 ELM 缓解的非线性建模
利用三维(3D)磁流体动力学(MHD)代码 JOREK,对 HL-2A 托卡马克进行了利用共振磁扰动(RMP)缓解边缘局部模式(ELM)的非线性建模。基于在 4.9 kAt 奇奇偶线圈电流下应用 n=1(n 为环形模式数)RMP 后建立的三维平衡,成功模拟出了与实验结果一致的 ELM 缓解。非线性模拟显示环形傅立叶谐波之间存在很强的模式耦合,从而允许磁能重新分配,使最不稳定的环形模式在较低水平达到饱和。这种磁能级联为在 HL-2A 中实现 RMP 引起的 ELM 缓解提供了解释。对模拟结果的详细检查显示,即使在 ELM 减缓阶段,谐振场屏蔽也会持续存在。不过,有限等离子体电阻率确实能够使谐振场部分穿透,从而改变边缘磁拓扑结构和边缘传输特性。当最不稳定环形模式的磁能达到最大值时,等离子体径向剖面在基座区附近会发生明显变化。通过 JOREK 模拟对所应用的 RMP 线圈电流进行系统扫描,发现在 HL-2A 上实现 ELM 减缓所需的临界值约为 4.5 kAt。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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