Gyrokinetic simulation of magnetic-island-induced electric potential vortex mode

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-01-01 DOI:10.1088/2058-6272/ad0d57

Feng WANG, Jiquan LI, Hongpeng QU, Xiaodong PENG

{"title":"Gyrokinetic simulation of magnetic-island-induced electric potential vortex mode","authors":"Feng WANG, Jiquan LI, Hongpeng QU, Xiaodong PENG","doi":"10.1088/2058-6272/ad0d57","DOIUrl":null,"url":null,"abstract":"Ion temperature gradient (ITG)-driven turbulence with embedded static magnetic islands is simulated by utilizing a gyrokinetic theory-based global turbulence transport code (GKNET) in this work. Different from the traditional equilibrium circular magnetic-surface average (EMSA) method, an advanced algorithm that calculates the perturbed magnetic-surface average (PMSA) of the electric potential has been developed to precisely deal with the zonal flow component in a non-circular magnetic surface perturbed by magnetic islands. Simulations show that the electric potential vortex structure inside islands induced by the magnetic islands is usually of odd parity when using the EMSA method. It is found that the odd symmetry vortex can transfer into an even one after a steep zonal flow gradient, i.e. the flow shear has been built in the vicinity of the magnetic islands by adopting the PMSA algorithm. The phase of the potential vortex in the poloidal cross section is coupled with the zonal flow shear. Such an electric potential vortex mode may be of essential importance in wide topics, such as the turbulence spreading across magnetic islands, neoclassical tearing mode physics, and also the interaction dynamics between the micro-turbulence and MHD activities.","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"1089","ListUrlMain":"https://doi.org/10.1088/2058-6272/ad0d57","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Ion temperature gradient (ITG)-driven turbulence with embedded static magnetic islands is simulated by utilizing a gyrokinetic theory-based global turbulence transport code (GKNET) in this work. Different from the traditional equilibrium circular magnetic-surface average (EMSA) method, an advanced algorithm that calculates the perturbed magnetic-surface average (PMSA) of the electric potential has been developed to precisely deal with the zonal flow component in a non-circular magnetic surface perturbed by magnetic islands. Simulations show that the electric potential vortex structure inside islands induced by the magnetic islands is usually of odd parity when using the EMSA method. It is found that the odd symmetry vortex can transfer into an even one after a steep zonal flow gradient, i.e. the flow shear has been built in the vicinity of the magnetic islands by adopting the PMSA algorithm. The phase of the potential vortex in the poloidal cross section is coupled with the zonal flow shear. Such an electric potential vortex mode may be of essential importance in wide topics, such as the turbulence spreading across magnetic islands, neoclassical tearing mode physics, and also the interaction dynamics between the micro-turbulence and MHD activities.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

磁岛诱导电动势涡旋模式的陀螺动力学模拟

本研究利用基于陀螺动理论的全球湍流传输代码（GKNET）模拟了内嵌静态磁岛的离子温度梯度（ITG）驱动湍流。与传统的平衡圆磁面平均（EMSA）方法不同，本文开发了一种计算电势扰动磁面平均（PMSA）的先进算法，以精确处理磁岛扰动的非圆磁面中的带状流分量。模拟结果表明，使用 EMSA 方法时，磁岛诱导的岛内电动势涡旋结构通常是奇奇偶性的。研究发现，采用 PMSA 算法，在磁岛附近形成陡峭的带状流动梯度，即流动剪切后，奇数对称涡旋可转变为偶数对称涡旋。极截面上的电势涡相位与带状流切变相耦合。这种电势涡模式可能对许多课题具有重要意义，如磁岛上的湍流扩散、新古典撕裂模式物理学，以及微湍流与 MHD 活动之间的相互作用动力学。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

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.