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Analysis of global transport of internal transport barrier in tokamak plasmas

Research Project

Project/Area Number 20K14446
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionKyoto University (2022)
National Institutes for Quantum Science and Technology (2020-2021)

Principal Investigator

Kin Fumiyoshi  京都大学, エネルギー理工学研究所, 助教 (40846747)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsプラズマ乱流輸送 / 内部輸送障壁 / 非局所的輸送 / トカマクプラズマ / 雪崩輸送 / 径電場ダイナミクス / 過渡応答解析 / ニューラルネットワーク / 大域的ダイナミクス / JT-60U / 径電場 / イオン熱輸送 / 電子熱輸送 / 荷電交換分光法 / 自己組織化臨界現象 / 硬直性分布 / マイクロ波反射計 / 電子サイクロトロン放射計測 / 帯状流 / ストリーマ / ドリフト波乱流 / 非局所輸送 / 電場シア / 電場曲率 / ニューラルネット / ノイズ除去 / プラズマ乱流
Outline of Research at the Start

本研究は、トカマクプラズマにおける内部輸送障壁(ITB)の制御の鍵を握る大域的輸送特性の解明に向けて、ITBの過渡応答実験を行い熱流束と乱流伝播を同時観測することで、ITBの輸送機構を明らかにすることを目的としている。この目的を達成するために、(i)那珂核融合研究所のJT-60U装置を用いて過渡輸送解析手法を確立し、(ii)米国・ゼネラルアトミックス社のDIII-D装置を用いて固体ペレット入射などによるITBの過渡応答実験を行い、熱流束と乱流の同時観測から因果関係を特定してITBの大域的輸送機構を明らかにしていく。

Outline of Final Research Achievements

The objective of this study was to investigate the origin of global response of Internal Transport Barrier (ITB) in Tokamak plasma and understand the formation mechanism of ITB. In order to verify core plasma transport and ITB formation, a comparison of the dynamics of heat flux and radial electric field was conducted during both ITB formation and non-formation conditions. The research yielded the following results: (1) dynamics of ITB formation in steady-state negative magnetic shear plasma, (2) global transient response of ITB against cold pulse, (3) development of a neural network-based analysis method for high time-resolution measurement of radial electric field, (4) occurrence of avalanching transport associated with bursty fluctuations and its impact on stiff profiles, and (5) influence of avalanching transport on radial electric field and ITB formation.

Academic Significance and Societal Importance of the Research Achievements

本研究により、トカマクプラズマにおける内部輸送障壁(ITB)の形成機構についての理解が大幅に進展した。大域的輸送がITBに与える影響は著しく、理論モデルの検証や改善に重要な発見となった。また、ITBは高温プラズマの乱流輸送を抑制し、プラズマの性能向上に重要な役割を果たす。ITB形成機構の解明は、トカマクプラズマの制御技術や将来の核融合エネルギー利用に関する基礎物理の構築に大きく貢献する。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Experimental evaluation of avalanche type of electron heat transport in magnetic confinement plasmas2022

    • Author(s)
      Kin F.、Itoh K.、Bando T.、Shinohara K.、Oyama N.、Yoshida M.、Kamiya K.、Sumida S.
    • Journal Title

      Nuclear Fusion

      Volume: 63 Issue: 1 Pages: 016015-016015

    • DOI

      10.1088/1741-4326/aca341

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dynamics of weak-magnetic-shear-sustained internal transport barrier during supersonic molecular-beam injection in JT-60U2021

    • Author(s)
      Kin F.、Yoshida M.、Takenaga H.、Honda M.、Tamura N.、Narita E.、Kamiya K.、Bando T.、Wakatsuki T.、Isayama A.
    • Journal Title

      Nuclear Fusion

      Volume: 61 Issue: 2 Pages: 026017-026017

    • DOI

      10.1088/1741-4326/abcad3

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spatio-temporal evolutions of ion heat flux and radial electric field during internal transport barrier formation on JT-60U2021

    • Author(s)
      Kin F、Itoh K、Yoshida M、Honda M、Kamada Y、Kamiya K、Narita E、Bando T
    • Journal Title

      Plasma Physics and Controlled Fusion

      Volume: 63 Issue: 3 Pages: 035030-035030

    • DOI

      10.1088/1361-6587/abd9e3

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Prediction of a single Gaussian shape of spectral line measured with low-dispersion spectrometer by using machine learning2021

    • Author(s)
      Kin F.、Nakano T.、Oyama N.、Terakado A.、Wakatsuki T.、Narita E.
    • Journal Title

      Review of Scientific Instruments

      Volume: 92 Issue: 5 Pages: 053505-053505

    • DOI

      10.1063/5.0039781

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] トカマクプラズマの内部輸送障壁形成における雪崩的熱輸送の役割2022

    • Author(s)
      金史良、伊藤公孝、篠原孝司、坂東隆宏、神谷健作
    • Organizer
      物理学会年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Observations of bursty fluctuations measured by reflectometer associating to avalanche-like transport in JT-60U2021

    • Author(s)
      F. Kin, K. Itoh, T. Bando, K. Shinohara, N. Oyama, M. Yoshida, K. Kamiya, S. Sumida
    • Organizer
      Asia-Pacific Transport Working Group Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] JT-60Uにおける突発的揺動と雪崩的熱輸送の観測2021

    • Author(s)
      金史良、伊藤公孝、坂東隆宏、篠原孝司、大山直幸、吉田麻衣子、神谷健作、隅田脩平
    • Organizer
      プラズマ核融合学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Dynamics of heat transport and radial electric field during internal transport barrier formation on JT-60U2020

    • Author(s)
      F. Kin, K. Itoh, M. Yoshida, M. Honda, Y. Kamada, K. Kamiya, E. Narita, T. Bando
    • Organizer
      4th Asia-Pacific Conference on Plasma Physics, Remote e-conference
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] JT-60Uにおける内部輸送障壁を有するプラズマの過渡的イオン熱輸送解析2020

    • Author(s)
      金史良、吉田麻衣子、竹永秀信、本多充、田村直樹、成田絵美、 神谷健作、坂東隆宏、若月琢磨、諫山明彦
    • Organizer
      プラズマ・核融合学会 第37回年会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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