High-sensitivity measurement of Zeeman effect using hydrogen Paschen-α emission line in fusion-divertor-relevant plasma.

IF 1.7 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION Review of Scientific Instruments Pub Date : 2025-04-01 DOI:10.1063/5.0252647

Minato Murakumo, Taiichi Shikama, Shinichiro Kado, Akihiro Iwata, Tsunehiro Morita, Shinsuke Oshima, Takuto Suzuki, Atsuki Mori, Gen Motojima, Takashi Minami, Shinji Kobayashi, Fumiyoshi Kin, Akihiro Ishizawa, Yuji Nakamura, Shigeru Konoshima, Tohru Mizuuchi, Shigeru Inagaki, Kazunobu Nagasaki, Masahiro Hasuo

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Abstract

In magnetically confined fusion reactors, the Zeeman effect can sometimes be utilized in spatially resolved spectroscopy to localize the observed line emission. To apply this method to divertor plasma spectroscopy, the relative magnitude of the Zeeman splitting to linewidth for hydrogen atomic emission lines in the visible to the near-infrared range was evaluated. It was found that the magnitude becomes the largest for the Paschen-α (Paα) emission line (1875 nm, 3-4). The observability of the Zeeman splitting on the Paα emission line spectrum was confirmed by an experiment using a hydrogen pellet ablation plasma in Heliotron J, which is relevant to the divertor plasma in terms of magnetic field strength (1.2 T), electron temperature (∼1 eV), and electron density (3.6 × 1020 m-3).

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利用氢Paschen-α发射线在融合导流器相关等离子体中高灵敏度测量塞曼效应。

在磁约束聚变反应堆中，塞曼效应有时可以用于空间分辨光谱来定位观测到的线发射。为了将该方法应用于转导等离子体光谱，对可见至近红外范围内氢原子发射谱线的塞曼分裂相对于线宽进行了计算。发现Paschen-α (Paα)发射谱线（1875 nm, 3-4）的星等最大。在Heliotron J中使用氢球烧蚀等离子体进行实验，证实了paa发射谱线上的塞曼分裂的可观测性，这与导流等离子体的磁场强度（1.2 T）、电子温度（~ 1 eV）和电子密度（3.6 × 1020 m-3）有关。

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

Review of Scientific Instruments 工程技术-物理：应用

CiteScore

3.00

自引率

12.50%

发文量

758

审稿时长

2.6 months

期刊介绍： Review of Scientific Instruments, is committed to the publication of advances in scientific instruments, apparatuses, and techniques. RSI seeks to meet the needs of engineers and scientists in physics, chemistry, and the life sciences.