Elucidation of heat transport process during high-beta/merging spherical tokamak formation
Project/Area Number |
19H01866
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 14010:Fundamental plasma-related
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Research Institution | The University of Tokyo |
Principal Investigator |
Tanabe Hiroshi 東京大学, 大学院新領域創成科学研究科, 准教授 (30726013)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2022)
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Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
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Keywords | プラズマ・核融合 / プラズマ診断 / 磁気リコネクション / コンピュータトモグラフィ / プラズマ科学 / 核融合 / 球状トカマク |
Outline of Research at the Start |
本研究では太陽フレア等の基盤物理として知られる磁気リコネクション(磁力線のつなぎかわり)を介した爆発的なエネルギー解放現象について、それを地上で実現可能な東京大学のプラズマ合体実験装置を用いて、そのエネルギー変換過程の解明および、それを核融合実験に応用した高ベータ球状トカマク生成実験に貢献することを目的とする。合体プラズマ全域を網羅した150CH二次元磁気プローブ・300CH二次元イオンドップラートモグラフィ計測に加え、電子温度・密度計測基盤の構築に主として取り組み、熱エネルギー輸送方程式を構成する主要項を網羅した詳細な統合解析可能な実験基盤の構築に取り組む。
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Outline of Final Research Achievements |
We investigated the explosive energy coversion process of magnetic reconnection as in solar flare with our falicity of high-beta/merging-startup spherical tokamak expreimentin the university of Tokyo. We mainly carried out the following two projects: (1) development of 2D imaging measurement of electron and ion acceleration/heating and (2) investigation of electron and ion acceleration/heating during "guide field" reconnection which has perpendicular toroidal component to reconnecting/anti-parallel poloidal magnetic field. We mainly carried out those two projects and found that electrons are accelerated/heated in the lower potential region, while ion temperature increases at higher potential side. Then, both electrons and ions are affected by collisional relaxation/transport process in the downstream and finally their structure is aligned with the magnetic field lines of closed flux surface of the spherical tokamak plasma after the end of merging.
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Academic Significance and Societal Importance of the Research Achievements |
本研究で主として取り組んだガイド磁場リコネクション現象は、太陽フレア等の爆発的エネルギー解放現象の基盤物理の理解という理学的側面の他に、工学的には球状トカマクの効率生成・加熱法として近年核融合ベンチャー等で応用が進む、合体法の基盤物理となる物理現象として重要である。応用を意識した時、既に解明済みの加熱スケーリング特性の他、加熱後にどのような構造が形成され、閉じ込め・輸送がどのようになるのかを理解しておくことが重要である。電子・イオンがどこでどのように加速・加熱を受け、輸送されるのか、今回特にシミュレーションで予測されなかった高電位領域のイオン加熱が実験主導で新たに発見されたことは特筆に値する。
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Report
(4 results)
Research Products
(57 results)
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[Journal Article] Overview of Merging Spherical Tokamak Experiments and Simulations for Burning, High-Beta and/or Absolute Minimum-B Plasma Formation2021
Author(s)
Y. Ono, M. Inomoto, H. Tanabe, H. Yamaguchi, M. Akimitsu, M. Gryaznevich, S. McNamara, P. Buxton, J. Kompulla, J. Wood, V. Nemytov, K. McClements, C. Z. Cheng, S. Usami and R. Horiuchi
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Journal Title
28th IAEA Fusion Energy Conference (FEC 2020)
Volume: IAC/P4-3
Pages: 1-8
Related Report
Peer Reviewed / Open Access
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[Presentation] High field application of merging/reconnection plasma startup in the ST40 and TS-6 spherical tokamaks2021
Author(s)
H. Tanabe, M. Gryaznevich, S. Mcnamara, J. Wood, H. Tanaka, M. Akimitsu, Y. Cai, D. Osin, P. Buxton, A. Rengle, O. Asunta, C. Z. Cheng, M. Inomoto and Y. Ono
Organizer
5th Asia Pacific Conference on Plasma Physics (AAPPS 2021)
Related Report
Int'l Joint Research / Invited
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[Presentation] Micro/macro-scale ion heating and transport process of magnetic reconnection during merging plasma startup of TS-6 spherical tokamak2019
Author(s)
H. Tanabe, Q. Cao, H. Tanaka, T. Ahmadi, M. Akimitsu, M. Gryaznevich,T. O'Gorman, J. Wood, R. Scannell, K. G. McClements, M. Inomoto and Y. Ono
Organizer
61th Annual Meeting of the APS Division of Plasma Physics
Related Report
Int'l Joint Research
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