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Interaction between high-energy electron and whistler wave in tokamak plasma

Research Project

Project/Area Number 21K03511
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionKyushu University

Principal Investigator

Ikezoe Ryuya  九州大学, 応用力学研究所, 准教授 (70582849)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords高エネルギー電子 / 硬X線 / 荷電粒子計測 / 高周波モード / 波動粒子相互作用 / 電子サイクロトロン加熱 / ピッチ角散乱 / 位相空間 / 高速電子 / 高速硬X線計測 / 高周波波動 / ピッチ角弁別 / 位相空間ダイナミクス / Kinetic instability / 球状トカマク / 自発励起波動 / ディスラプション / 非誘導プラズマ立上げ / 波動計測 / 速度分布 / 高エネルギー粒子計測 / ホイッスラー波 / トカマク / アバランチ電場
Outline of Research at the Start

高エネルギー電子の新たなエネルギー散逸機構として着目されているホイッスラー波の詳細計測と高エネルギー電子の速度分布計測を通して、自発励起波動の効果を含めたトカマクプラズマ中の高エネルギー電子のダイナミクスを世界に先駆けて解明することを目指す。具体的な課題の一つは、炉設計の観点から非常に重要な逃走電子生成のアバランチ閾値電場に対する逃走電子駆動ホイッスラー波の影響を実験的に調べ、最新のモデルを検証することである。本研究においてQUEST球状トカマクに念入りな高周波波動計測環境を整備し、挑戦的な粒子計測に基づく高精度な高速電子速度分布計測手法を構築する。

Outline of Final Research Achievements

An excellent high-frequency wave measurement environment has been constructed on the QUEST spherical tokamak, where abundant high-energy electrons are generated through electron cyclotron heating, and the conditions and characteristics of high-frequency waves in the MHz band driven by high-energy electrons were investigated in detail. In addition, by developing a challenging high-energy particle probe, we succeeded in extracting phase-space information of high-energy electrons, which is important in plasma current start-up and runaway electron beam formation processes during disruption. Furthermore, as a by-product of ultra-high-speed measurement of high-intensity hard X-rays, it was discovered that the high-energy electron flux itself that emits hard X-rays fluctuates with the high-frequency waves, providing evidence for the existence of interactions between high-energy electrons and the waves they excite.

Academic Significance and Societal Importance of the Research Achievements

トカマクプラズマにおける高エネルギー電子の位相空間情報を高精度に取得する手法が初めて開拓された.これにより磁気圏プラズマ研究とも課題を共有する波動粒子相互作用の非線形発展等の未解明物理に対し,今後実験室プラズマでの精緻な研究展開が期待できる.また,フュージョンエネルギー開発で注目される球状トカマク型コンパクト炉の実現に向けて,高エネルギー電子を活用した超高効率プラズマ電流立ち上げは非常に魅力的であり,その制御手法としての波動活用およびディスラプション対策として波動応用に向けた知見が得られた.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (20 results)

All 2023 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] DYNAMICS OF FAST ELECTRONS AND KINETIC MODES IN THE ELECTRON CYCLOTRON HEATED QUEST SPHERICAL TOKAMAK2023

    • Author(s)
      R. IKEZOE, H. IDEI, T. ONCHI, K. KURODA, M. HASEGAWA, Y. NAGASHIMA, K. HANADA, T. IDO, F. ZENNIFA, T. YAMAGUCHI, R. MIYATA, Y. WANG, A. EJIRI, S. MURAKAMI
    • Journal Title

      29th IAEA FEC proceedings

      Volume: -

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Initial testing of ohmic heating through double flux swing during electron cyclotron start-up in the QUEST spherical tokamak2023

    • Author(s)
      ZHANG Yifan、ONCHI Takumi、NAKAMURA Kazuo、YUE Qilin、NAGATA Takahiro、KAWASAKI Shoji、KURODA Kengoh、HASEGAWA Makoto、IKEZOE Ryuya、IDO Takeshi、HANADA Kazuaki、IDEI Hiroshi
    • Journal Title

      Plasma Science and Technology

      Volume: 25 Issue: 5 Pages: 055104-055104

    • DOI

      10.1088/2058-6272/acafc2

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] 8.56-GHz quasi-optical launcher system with incident-mode selectivity on the QUEST spherical tokamak2023

    • Author(s)
      Idei H.、Sakaguchi M.、Mishra K.、Onchi T.、Ikezoe R.、Watanabe O.、Tanaka Y.、Saito T.、Ido T.、Hanada K.
    • Journal Title

      Fusion Engineering and Design

      Volume: 189 Pages: 113479-113479

    • DOI

      10.1016/j.fusengdes.2023.113479

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Adaptive Capon beamforming for lensless electron cyclotron emission imaging with high spatial resolution2022

    • Author(s)
      Idei H.、Fukuyama M.、Sakai S.、Mishra K.、Nishimura K.、Ikezoe R.、Onchi T.、Ido T.、Hanada K.
    • Journal Title

      Review of Scientific Instruments

      Volume: 93 Issue: 10 Pages: 103531-103531

    • DOI

      10.1063/5.0101632

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development of a Fast Visible Light Measurement System for the Study of Ion Cyclotron Range of Frequency Waves in GAMMA 10/PDX Plasmas2021

    • Author(s)
      EJIRI Akira、HIRATA Mafumi、ICHIMURA Makoto、YOSHIKAWA Masayuki、IKEZOE Ryuya、KAMIO Shuji
    • Journal Title

      Plasma and Fusion Research

      Volume: 16 Issue: 0 Pages: 1402096-1402096

    • DOI

      10.1585/pfr.16.1402096

    • NAID

      130008091206

    • ISSN
      1880-6821
    • Year and Date
      2021-09-17
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Designing an upgrade of ohmic heating system for the QUEST spherical tokamak2021

    • Author(s)
      Zhang Yifan、Onchi Takumi、Nakamura Kazuo、Kidani Akihiro、Yue Qilin、Kuroda Kengoh、Hasegawa Makoto、Ikezoe Ryuya、Idei Hiroshi
    • Journal Title

      Fusion Engineering and Design

      Volume: 168 Pages: 112362-112362

    • DOI

      10.1016/j.fusengdes.2021.112362

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Measurement of axial phase difference of density fluctuations owing to spontaneously excited waves by using microwave reflectometer on GAMMA 10/PDX2021

    • Author(s)
      Sekine R.、Hirata M.、Ikezoe R.、Jang S.、Kubota Y.、Kayano H.、Sugata K.、Aizawa T.、Noguchi D.、Kim D.、Sugimoto Y.、Matsuura R.、Yamazaki H.、Ichimura M.、Yoshikawa M.、Kohagura J.、Nakashima Y.、Ezumi N.、Sakamoto M.
    • Journal Title

      Review of Scientific Instruments

      Volume: 92 Issue: 5 Pages: 053506-053506

    • DOI

      10.1063/5.0043821

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] Diagnosing fast electrons interacted with kinetic waves on spherical tokamak2023

    • Author(s)
      Ryuya IKEZOE
    • Organizer
      7th Asia-Pacific Conference on Plasma Physics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] DYNAMICS OF FAST ELECTRONS AND KINETIC MODES IN THE ELECTRON CYCLOTRON HEATED QUEST SPHERICAL TOKAMAK2023

    • Author(s)
      R. IKEZOE, H. IDEI, T. ONCHI, K. KURODA, M. HASEGAWA, Y. NAGASHIMA, K. HANADA, T. IDO, F. ZENNIFA, T. YAMAGUCHI, R. MIYATA, Y. WANG, A. EJIRI, S. MURAKAMI
    • Organizer
      29th IAEA Fusion Energy Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] QUESTにおける高速電子の直接検出2023

    • Author(s)
      池添竜也, 出射 浩,恩地拓己, 長谷川 真, 永島芳彦, 花田和明,井戸 毅, Zennifa Fadilla, 山口貴大, 宮田陸矢, 白井祐大, 田井紗也香, 王 雲飛
    • Organizer
      第40回プラズマ・核融合学会年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] QUEST における高速電子ダイナミクス解明のための高速硬X 線計測器の開発2023

    • Author(s)
      白井祐大,池添竜也,出射浩,花田和明,井戸毅,長谷川真,恩地拓己,宮田陸矢,田井紗也香,山口貴大
    • Organizer
      プラズマ・核融合学会 九州・沖縄・山口支部 第27回支部大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Probing of fast electrons and corresponding kinetic modes on QUEST2023

    • Author(s)
      Ryuya IKEZOE
    • Organizer
      11th Int. QUEST WS "RF startup and sustainment in Spherical Tokamak"
    • Related Report
      2022 Research-status Report
  • [Presentation] 球状トカマク装置QUESTにおける高周波モードと高エネルギー電子ダイナミクスのプロービングに向けた進展2022

    • Author(s)
      池添竜也, 出射 浩, 恩地拓己, 黒田賢剛, 王 洋, 張 逸凡, 坂井聖也, 宮田陸矢, 山口貴大, ZENNIFA Fadilla, 関谷 泉, 長谷川 真, 永島芳彦, 井戸 毅, 花田和明
    • Organizer
      第39回プラズマ・核融合学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 球状トカマク中の高エネルギー電子観測用 二次元硬X線計測器開発と初期結果2022

    • Author(s)
      王 洋, 恩地拓己, 花田和明, 張 逸凡, 関谷 泉, 池添竜也, 出射 浩
    • Organizer
      第39回プラズマ・核融合学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Sudden change events of plasma current during electron-cyclotron current start-up on the QUEST spherical tokamak2022

    • Author(s)
      R. Ikezoe, K. Takeda, K. Kuroda, T. Onchi, T. Nagata, I. Sekiya, H. Idei, F. Zennifa, Y. Zhang, S. Sakai, R. Miyata, T. Yamaguchi, M. Hasegawa, Y. Nagashima, T. Ido, K. Hanada
    • Organizer
      31st Int. Toki Conf.
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 非誘導立上げQUESTプラズマ中に自発励起される高周波モードの振る舞い2021

    • Author(s)
      池添竜也, 武田康佑, 恩地拓己, 黒田賢剛, 出射浩, 福山雅治, 張逸凡, 坂井聖也, ZENNIFA Fadilla, 長谷川真, 井戸毅, 花田和明
    • Organizer
      第38回プラズマ・核融合学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 球状トカマクQUESTにおける ホイッスラー周波数帯の波動励起の観測2021

    • Author(s)
      池添竜也, 武田康佑, 恩地拓己, 黒田賢剛, 出射浩, 福山雅治, 張逸凡, 坂井聖也, ZENNIFA Fadilla, 長谷川真, 井戸毅, 花田和明
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 実験室ミラー磁場配位における速度空間歪みとエネルギー移送2021

    • Author(s)
      池添竜也
    • Organizer
      日本物理学会第77回年会
    • Related Report
      2021 Research-status Report
  • [Presentation] QUEST内側ポロイダルヌル放電における高周波の準周期的励起の観測2021

    • Author(s)
      池添竜也,武田康佑,恩地拓己,黒田賢剛,出射浩,福山雅治,Yifan Zhang,坂井聖也,Fadilla Zennifa,長谷川真,永島芳彦,井戸毅,花田和明
    • Organizer
      第10回ICRF加熱研究会「ICRF加熱装置の高性能化と将来応用」
    • Related Report
      2021 Research-status Report
  • [Presentation] QUESTにおける波動粒子相互作用の観測2021

    • Author(s)
      池添竜也
    • Organizer
      第17回QUEST研究会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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