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Elucidation of electron heating mechanism during magnetic reconnection in the presence of high guide field and development of its control technique

Research Project

Project/Area Number 20H01879
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 14010:Fundamental plasma-related
Research InstitutionThe University of Tokyo

Principal Investigator

Inomoto Michiaki  東京大学, 大学院新領域創成科学研究科, 教授 (00324799)

Co-Investigator(Kenkyū-buntansha) 小野 靖  東京大学, 大学院新領域創成科学研究科, 教授 (30214191)
神尾 修治  核融合科学研究所, ヘリカル研究部, 助教 (80705525)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2021: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Keywords磁気リコネクション / 電子加速 / 球状トカマク
Outline of Research at the Start

天体プラズマや核融合プラズマといった高導電率磁化プラズマ中の大域的な構造形成とエネルギー変換をもたらす磁気リコネクション現象について、特にリコネクション磁場に直交する磁場成分(ガイド磁場)が存在する場合の電子加速・加熱のメカニズムとして予想されている電場直接加速機構と一次フェルミ加速に類する機構の発現・抑制メカニズムを実験的に検証し、その効率を外部から制御する手法を確立して応用に結び付けようとするものである。

Outline of Final Research Achievements

In the magnetic reconnection under high guide magnetic field generated in the torus plasma merging experiment, we developed a novel method to change the electrical boundary condition in the downstream region, and succeeded in controlling the electric field component parallel to the magnetic field that directly accelerates the charged particles within a short period. We confirmed that an increase in the electric field component parallel to the magnetic field enhances the acceleration effect of charged particles, and demonstrated that the energy conversion process associated with magnetic reconnection can be transformed. The electric field component parallel to the magnetic field consists of the inductive reconnection electric field and the in-plane static electric field that cancels it. Since the in-plane static electric field in the downstream region is largely affected by the condition in the upstream region, the importance of macroscopic understanding of reconnection was pointed out.

Academic Significance and Societal Importance of the Research Achievements

磁気リコネクション現象において、静電場は受動的な役割を果たすと考えられることが多かったが、本研究は室内実験の利点を活かして静電場を主体的に取り扱うことによって、その役割を明確化し、磁気リコネクションにおけるエネルギー変換機構の解明に寄与できた。また、高ガイド磁場下での磁気リコネクションにおいて解放された磁気エネルギーを、磁力線に平行方向の電子/イオンの運動エネルギーへと変換させうることは、磁場閉じ込め核融合プラズマの初期加熱やフロー形成への応用が期待される。

Report

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

    (15 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 9 results,  Invited: 3 results)

  • [Int'l Joint Research] 台湾成功大学(その他の国・地域)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Control of transient static electric field in the magnetic reconnection experiment with large guide field2023

    • Author(s)
      Taiju Suzuki, Michiaki Inomoto, Hailin Jin, Kei Nakatsukasa
    • Journal Title

      Plasma and Fusion Research

      Volume: -

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Direct Measurement of Electron Cyclotron Emission during High Guide Field Magnetic Reconnection2022

    • Author(s)
      Inomoto Michiaki、Kondo Kyohei、Kawamori Eiichirou、Igami Hiroe
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 9 Pages: 094501-094501

    • DOI

      10.7566/jpsj.91.094501

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Control of electron acceleration process during merging start-up of spherical tokamak2021

    • Author(s)
      Inomoto M.、Mihara T.、Kondo K.、Kaneko H.、Kusano K.、Kaneko K.、Maeda Y.、Shinohara A.、Jin H.、Suzuki T.、Tanabe H.、Ono Y.、Kamio S.、Kawamori E.
    • Journal Title

      Nuclear Fusion

      Volume: 61 Issue: 11 Pages: 116069-116069

    • DOI

      10.1088/1741-4326/ac2107

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Transformation of energy conversion process during ST merging start-up2023

    • Author(s)
      M. Inomoto, T. Suzuki, H. Jin, K. Nakatsukasa, H. Tanabe, Y. Ono(Univ
    • Organizer
      FY2022 US-Japan Workshop on "Progress of the Innovative and Alternative Confinement Concepts (IAC)"
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Overview of UTST/TS-6 ST merging startup experiments2022

    • Author(s)
      M. Inomoto, H. Tanabe, Y. Ono
    • Organizer
      21st International Spherical Torus Workshop
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Active Control of Reconnection Downstream Condition for Enhancement of Electron Acceleration in the UTST device2022

    • Author(s)
      T. Suzuki, M. Inomoto, H. Jin, K. Nakatsukasa
    • Organizer
      The 31st International Toki Conference on Plasma and Fusion Research (ITC31)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 球状トカマク合体立ち上げにおいて発生する過渡的電場がリコネクション過程にもたらす影響2022

    • Author(s)
      鈴木大樹、井通暁、キン海林、中務敬
    • Organizer
      第14回核融合エネルギー連合講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Control of in-plane electric field during merging formation of spherical tokamak2022

    • Author(s)
      M. Inomoto, A. Shinohara, K. Kaneko, Y. Maeda, H. Jin, T. Suzuki, H. Tanabe, Y. Ono
    • Organizer
      2022 US-Japan Woershop on Compact Tori
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Control of Electron Acceleration Process during Merging Start-up of Spherical Tokamak2021

    • Author(s)
      M. Inomoto, T. Mihara, K. Kondo, H. Kaneko, K. Kusano, S. Kamio, E. Kawamori
    • Organizer
      28th IAEA Fusion Energy Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Electron acceleration in downstream region of high guide field magnetic reconnection in toroidal plasma merging experiment2021

    • Author(s)
      M. Inomoto, A. Shinohara, K. Kaneko, Y. Maeda, H. Jin, T. Suzuki, H. Tanabe, Y. Ono
    • Organizer
      10th East-Asia School and Workshop on Laboratory, Space, and Astrophysical Plasmas (EASW-10)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Control of in-plane electric field during guide field magnetic reconnection in torus-type laboratory experiment2021

    • Author(s)
      M. Inomoto, A. Shinohara, K. Kaneko, Y. Maeda, H. Jin, T. Suzuki, H. Tanabe, Y. Ono
    • Organizer
      AAPPS-DPP 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Role of parallel electron current channel in high guide field magnetic reconnection2020

    • Author(s)
      M. Inomoto, T. Mihara, K. Kondo, K. Kusano, T. Tanabe, Y. Ono, S. Kamio
    • Organizer
      AAPPS-DPP 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of Self-generated Poloidal Electric Field during Merging Start-up of Spherical Tokamak2020

    • Author(s)
      M. Inomoto, K. Kondo, T. Mihara, K. Kusano, A. Shinohara, Y. Maeda, K. Kaneko, H. Tanabe, Y. Ono
    • Organizer
      US-Japan Workshop on Compact Tori 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高ガイド磁場下でのリコネクションにおける沿磁力線電子加速2020

    • Author(s)
      井 通暁、三原卓巳、近藤恭平、草野一、金子健一郎、篠原淳志、前田陽平、田辺博士、小野靖、河森栄一郎
    • Organizer
      プラズマ・核融合学会 第37回年会
    • Related Report
      2020 Annual Research Report

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

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