Magnetics only real-time equilibrium reconstruction on ASDEX Upgrade

IF 2.1 2区物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS

Plasma Physics and Controlled Fusion Pub Date : 2024-03-05 DOI:10.1088/1361-6587/ad2c2b

L Giannone, M Weiland, R Fischer, O Kudlacek, T Lunt, M Maraschek, B Sieglin, W Suttrop, G Conway, M Dunne, E Fable, J C Fuchs, A Gude, V Igochine, P J McCarthy, R McDermott, the ASDEX Upgrade Team1

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Abstract

Real-time reconstruction of the magnetic equilibrium provides fundamental control of plasma shape and position in a tokamak. Details of the implementation of the equilibrium reconstruction code developed for the ASDEX Upgrade tokamak (JANET++) are summarized. Cubic Hermite splines are introduced as current density basis functions for solving the Grad–Shafranov equation. The choice of the optimal Tikhonov regularization parameter is discussed. The code is validated by comparing the results of the equilibrium reconstruction with those of further equilibrium reconstructions available on ASDEX Upgrade (CLISTE and IDE). In a high time resolution study of a discharge with edge localized modes (ELM), the poloidal asymmetry of the fits and magnetic probe measurements suggest that the real-time equilibrium reconstruction captures the essential features of the current density redistribution in an ELMing edge plasma. An efficient algorithm to locate multiple X-points and identify the active one in advanced X-divertor and snowflake divertor configurations is presented.

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仅在 ASDEX 升级版上进行磁学实时平衡重建

磁平衡的实时重建提供了对托卡马克中等离子体形状和位置的基本控制。本文概述了为 ASDEX 升级型托卡马克（JANET++）开发的平衡重建代码的实施细节。在求解 Grad-Shafranov 方程时，引入了立方 Hermite 样条作为电流密度基函数。讨论了最佳 Tikhonov 正则化参数的选择。通过将平衡重建结果与 ASDEX 升级版（CLISTE 和 IDE）上的其他平衡重建结果进行比较，对代码进行了验证。在对具有边缘局部模式（ELM）的放电进行的高时间分辨率研究中，拟合和磁探针测量的极不对称表明，实时平衡重构捕捉到了ELM边缘等离子体中电流密度再分布的基本特征。介绍了在先进的 X 分流器和雪花分流器配置中定位多个 X 点并识别活动 X 点的有效算法。

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

Plasma Physics and Controlled Fusion 物理-物理：核物理

CiteScore

4.50

自引率

13.60%

发文量

224

审稿时长

4.5 months

期刊介绍： Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.