Investigation on the roles of equilibrium toroidal rotation during edge-localized mode mitigated by resonant magnetic perturbations

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-01 DOI:10.1088/2058-6272/ad0d4d

Liangkang DONG, Shaoyong CHEN, Maolin MOU, Yang LUO, Chenchen QIN, Changjian TANG

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引用次数: 0

Abstract

The effects of equilibrium toroidal rotation during edge-localized mode (ELM) mitigated by resonant magnetic perturbation (RMP) are studied with the experimental equilibria of the EAST tokamak based on the four-field model in the BOUT++ code. As the two main parameters to determine the toroidal rotation profiles, the rotation shear and magnitudes were separately scanned to investigate their roles in the impact of RMPs on peeling–ballooning (P-B) modes. On one hand, the results show that strong toroidal rotation shear is favorable for the enhancement of the self-generated

shearing rate

with RMPs, leading to significant ELM mitigation with RMP in the stronger toroidal rotation shear region. On the other hand, toroidal rotation magnitudes may affect ELM mitigation by changing the penetration of the RMPs, more precisely the resonant components. RMPs can lead to a reduction in the pedestal energy loss by enhancing the multimode coupling in the turbulence transport phase. The shielding effects on RMPs increase with the toroidal rotation magnitude, leading to the enhancement of the multimode coupling with RMPs to be significantly weakened. Hence, the reduction in pedestal energy loss by RMPs decreased with the rotation magnitude. In brief, the results show that toroidal rotation plays a dual role in ELM mitigation with RMP by changing the shielding effects of plasma by rotation magnitude and affecting

by rotation shear. In the high toroidal rotation region, toroidal rotation shear is usually strong and hence plays a dominant role in the influence of RMP on P-B modes, whereas in the low rotation region, toroidal rotation shear is weak and has negligible impact on P-B modes, and the rotation magnitude plays a dominant role in the influence of RMPs on the P-B modes by changing the field penetration. Therefore, the dual role of toroidal rotation leads to stronger ELM mitigation with RMP, which may be achieved both in the low toroidal rotation region and the relatively high rotation region that has strong rotational shear.

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关于共振磁扰动缓解边缘定位模式期间平衡环形旋转作用的研究

基于 BOUT++ 代码中的四场模型，利用 EAST 托卡马克的实验平衡，研究了共振磁扰动（RMP）缓解边缘局部模式（ELM）期间平衡环形旋转的影响。作为决定环形旋转剖面的两个主要参数，旋转剪切力和幅度被分别扫描，以研究它们在共振磁扰动对剥离-膨胀（P-B）模式的影响中的作用。结果表明，一方面，强环形旋转剪切力有利于提高 RMP 的自生剪切率，从而在强环形旋转剪切力区域内通过 RMP 显著减缓 ELM。另一方面，环形旋转幅度可能会通过改变 RMP 的穿透力（更确切地说是共振成分）来影响 ELM 减缓效果。RMP 可通过增强湍流传输阶段的多模耦合来减少基座能量损失。RMP 的屏蔽效应随环形旋转幅度的增加而增加，导致 RMP 的多模耦合增强作用明显减弱。因此，RMP 的基座能量损失随旋转幅度的增加而减少。简而言之，研究结果表明，环形旋转通过旋转幅度改变等离子体的屏蔽效应，并通过旋转剪切力影响等离子体的屏蔽效应，在利用 RMP 缓解 ELM 方面发挥着双重作用。在高环形旋转区域，环形旋转剪切通常很强，因此在 RMP 对 P-B 模式的影响中起主导作用；而在低旋转区域，环形旋转剪切很弱，对 P-B 模式的影响可以忽略不计，而旋转幅度则通过改变场穿透力在 RMP 对 P-B 模式的影响中起主导作用。因此，环面旋转的双重作用导致 RMP 对 ELM 的缓解作用更强，这在低环面旋转区域和具有强旋转剪切力的相对高旋转区域均可实现。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.