Plasma current tomography for HL-2A based on Bayesian inference

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-12-28 DOI:10.1088/2058-6272/ad1980

Zi Liu, Tianbo Wang, Muquan Wu, Zheng-ping Luo, Shuo Wang, Tengfei Sun, Bingjia Xiao, Jiangang Li

引用次数: 0

Abstract

An accurate plasma current profile has irreplaceable value for the steady state operation of the plasma. In this study, the plasma current tomography based on Bayesian inference is applied to HL-2A device and used to reconstruct the plasma current profile, two different Bayesian probability priors are tried, namely the Conditional AutoRegressive (CAR) prior and the Advanced Squared Exponential (ASE) kernel prior. Compared to the CAR prior, the ASE kernel prior adopts non-stationary hyperparameters and introduces the current profile of the reference discharge into the hyperparameters, which can make the shape of the current profile more flexible in space. The results indicate that the ASE prior couples more information, reduces the probability of unreasonable solutions, and achieves higher reconstruction accuracy.

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基于贝叶斯推理的 HL-2A 等离子体电流断层扫描

准确的等离子体电流曲线对于等离子体的稳态运行具有不可替代的价值。本研究将基于贝叶斯推理的等离子体电流断层成像技术应用于 HL-2A 装置，并尝试使用两种不同的贝叶斯概率先验，即条件自回归（CAR）先验和高级平方指数（ASE）核先验来重建等离子体电流曲线。与条件自回归先验相比，ASE 核先验采用了非稳态超参数，并将参考放电的电流曲线引入超参数中，从而使电流曲线的形状在空间上更加灵活。结果表明，ASE 先验耦合了更多信息，降低了不合理解的概率，实现了更高的重构精度。

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.