Simulation on the impact of diamagnetic drift on edge localized modes

doi:10.16568/j.0254-6086.202403016

Abstract

Abstract: In this study, numerical investigations on the effect of diamagnetic drift on ELMs are conducted using the BOUT++ three-field model, with a focus on the hybrid scenario in the HL-3 tokamak. The results show that diamagnetic drift has a significant stabilizing effect on ELMs, especially on the ballooning modes with high toroidal mode numbers, which lead to the most unstable modes transition from ballooning modes with high toroidal mode numbers to peeling modes with low toroidal numbers. Furthermore, the study reveals that the variation in the radial distribution of diamagnetic drift induces deformation in the ELM mode structure. Analysis of the ELM size shows diamagnetic drift can reduce the amplitude of ELM bursts, which is beneficial for the control of ELMs in HL-3 hybrid scenario.

Key words: HL-3 tokamak, Edge localized mode, BOUT++, Diamagnetic drift

摘要： 使用 BOUT++三场模型，针对 HL-3 装置混合运行模式，数值模拟研究了抗磁漂移对 ELM 的影响。研究结果表明，抗磁漂移对 ELM，尤其是高环向模数的气球模具有显著的致稳作用，使模式从高环向模数的气球模主导转换为低环向模数的剥离模主导。研究还发现，抗磁漂移的径向分布的不均匀性会导致 ELM 模结构的变形。通过对 ELM 幅度的分析发现，抗磁漂移可以减小 ELM 幅度，这对 HL-3 未来混合运行模式中如何有效控制 ELM 具有一定的参考价值。

关键词: HL-3, 边缘局域模, BOUT++, 抗磁效应

CLC Number:

TL65+ 2

ZHOU Yu-jie, HAO Guang-zhou, ZHU Yi-ren, XUE Miao . Simulation on the impact of diamagnetic drift on edge localized modes[J]. Nuclear Fusion and Plasma Physics, 2024, 44(3): 351-358.

周煜捷, 郝广周, 朱毅仁, 薛淼. 抗磁漂移对边缘局域模影响的数值模拟研究[J]. 核工业西南物理研究院, 2024, 44(3): 351-358.

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