2023 Fiscal Year Final Research Report
Study on structure formation and non-steady-state dynamics of detached divertor by laboratory plasma experiments
| Project/Area Number |
20H01883
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 14020:Nuclear fusion-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
飛田 健次 東北大学, 工学研究科, 教授 (50354569)
岡本 敦 名古屋大学, 工学研究科, 准教授 (50396793)
木崎 雅志 核融合科学研究所, ヘリカル研究部, 助教 (70598945)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 磁場閉じ込め核融合 / 非接触ダイバータ / 電子–イオン再結合 / 分子活性化再結合 / 高周波プラズマ / DT-ALPHA / 高エネルギーイオン |
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| Outline of Final Research Achievements |
The unique behavior attributed to hydrogen molecular activated recombination (MAR) was observed in the DT-ALPHA device. A method for measuring rotational and vibrational distributions of hydrogen molecules based on the hydrogen molecular spectroscopy was developed. It was confirmed that the MAR attributed to ion conversion reaction played important role in rollover of the electron density. It was indicated that depletion of low-energy electrons due to volumetric recombination could deform electron energy distribution. By utilizing the selective ion transmission of retarding field analyzers, a method for determining parallel and perpendicular ion temperatures was proposed, and its validity was investigated experimentally. Operating conditions for improving proton ratio in an ion beam source was analyzed by combing a kinetic code simulation and rate equations for hydrogen ions. A method for measuring energetic ion beam penetrating in a bulk plasm was developed.
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| Free Research Field |
磁場閉じ込め核融合
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| Academic Significance and Societal Importance of the Research Achievements |
高周波放電装置において，水素分子活性化再結合プラズマの生成および背景プラズマから分離した高エネルギーイオンビームの計測を可能とした．既存の装置では高エネルギーイオン衝突が引き起こす励起水素原子・分子の生成および消滅過程を研究する事は困難であったが，それを可能とする環境の構築に成功した．また，体積再結合の進展に伴い電子エネルギー分布に歪みが生じ得る事や，単一の計測器で異なる2方向のイオン温度を得る可能性を示した．得られた結果や開発したプラズマ計測手法は実験装置に制限されない成果であり，核融合エネルギーの利用実現に向けた課題であるダイバータの熱制御性能の改善のための研究に貢献しうる．
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