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Exploitation of helical plasma experiments for quantitative study of fast tokamak shutdown scenario

Research Project

Project/Area Number 21H01070
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionKyoto University (2023)
National Institutes for Quantum Science and Technology (2021-2022)

Principal Investigator

Matsuyama Akinobu  京都大学, エネルギー科学研究科, 准教授 (90581075)

Co-Investigator(Kenkyū-buntansha) 坂本 隆一  核融合科学研究所, 研究部, 教授 (10290917)
柴田 欣秀  岐阜工業高等専門学校, その他部局等, 准教授 (20633209)
高橋 宏幸  東北大学, 工学研究科, 講師 (30768982)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2022: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Keywords核融合プラズマ / ITER / ディスラプション / ペレット入射 / 粉砕 / MHD / 逃走電子 / ペレット粉砕入射 / 溶発
Outline of Research at the Start

核燃焼トカマク放電に挑戦するITERでは予期しない不安定放電による装置へのダメージを抑制するため、極低温の水素とネオンの混合固体をガスで加速・粉砕し、入射する。世界各国で模擬実験が行われているが不安定放電中では固体とプラズマの相互作用を観測することが難しい。本研究ではLHD装置を活用し、世界で初めて、混合固体とプラズマの相互作用を不安定性のない「静かな」放電で観測することにより詳細な理論シミュレーションとの比較を実現する。

Outline of Final Research Achievements

Shattered Pellet Injection (SPI) is expected to be used by the magnetically confined fusion reactor ITER to mitigate machine loads caused by major disruptions. The ablation process of cryogenic solid fragments of hydrogen and neon has been studied. The experimental observation in the Large Helical Device demonstrated the control of the cross-field transport of high-density plasmoids by adding a small amount of impurities to the cryogenic solid pellet. The developed ablation model was implemented in the disruption integrated code INDEX and applied to the analysis of tokamak experiments, elucidating the deterioration in the fueling efficiency of pure hydrogen SPI in DIII-D, and constituting the simulation database for optimizing the SPI system in ITER.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られたペレット溶発および粉砕ペレット入射に関する研究成果は、世界7極で推進中の磁場閉じ込め核融合実験炉計画に対し、ディスラプション緩和システムの最適化に資するデータベースを構築するものでITER計画の課題解決に貢献する成果として評価される。他にも本研究で開発したモデルやコードを用いたJT-60UやJT-60SA、核融合原型炉のディスラプション特性に関する研究が進展しており、本研究計画の実施によって、ITERおよびトカマク型核融合炉にとって最大の難題であるディスラプション対策に関する様々な研究成果が創出された。

Report

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

    (31 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (7 results) Journal Article (16 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 15 results,  Open Access: 11 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 5 results) Remarks (2 results)

  • [Int'l Joint Research] ITER機構/CEA(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] General Atomics(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] マックスプランクプラズマ物理研究所(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] ITER機構/CEA(フランス)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] General Atomics(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ITER機構/CEA(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] General Atomics(米国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Spatial Distribution Analyses of Axially Long Plasmas under a Multi-Cusp Magnetic Field Using a Kinetic Particle Simulation Code KEIO-MARC2024

    • Author(s)
      Nishimura Ryota、Seino Tomohiro、Yoshimura Keigo、Takahashi Hiroyuki、Matsuyama Akinobu、Hoshino Kazuo、Oishi Tetsutarou、Tobita Kenji
    • Journal Title

      Plasma

      Volume: 7 Issue: 1 Pages: 64-75

    • DOI

      10.3390/plasma7010005

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Better Understanding of Hydrogen Pellet Ablation Cloud Spectra through the Occupation Probability Formalism in LHD2024

    • Author(s)
      Goto Motoshi、Motojima Gen、Sakamoto Ryuichi、Pegourie Bernard、Matsuyama Akinobu、Oishi Tetsutarou、Kawate Tomoko、Kawamoto Yasuko
    • Journal Title

      Atoms

      Volume: 12 Issue: 1 Pages: 1-1

    • DOI

      10.3390/atoms12010001

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Structure of pellet cloud emission and relation with the local ablation rate2024

    • Author(s)
      B. Pegourie, E. Geulin, M. Goto, A. Matsuyama, G. Motojima, R. Sakamoto
    • Journal Title

      NUCLEAR FUSION

      Volume: 64 Issue: 5 Pages: 056026-056026

    • DOI

      10.1088/1741-4326/ad326c

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Integrated Modeling of Runaway Electron Beam Formation in JA DEMO Post-Disruption Plasmas2023

    • Author(s)
      YAMAMOTO Yasuhiro、MATSUYAMA Akinobu、SOMEYA Youji、CHEN Weixi、MIYAMOTO Seiji、SHIBATA Yoshihide
    • Journal Title

      Plasma and Fusion Research

      Volume: 18 Issue: 0 Pages: 1203064-1203064

    • DOI

      10.1585/pfr.18.1203064

    • ISSN
      1880-6821
    • Year and Date
      2023-08-02
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impact of selective ion transmission on measurement by retarding field analyzer2023

    • Author(s)
      Takahashi H.、Seino T.、Nishimura R.、Yoshimura K.、Kanno A.、Hara T.、Takahashi Y.、Kagaya S.、Matsuyama A.、Hayashi Y.、Tobita K.
    • Journal Title

      Physics of Plasmas

      Volume: 30 Issue: 5 Pages: 1-8

    • DOI

      10.1063/5.0144798

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Characterization of early current quench time during massive impurity injection in JT-60SA2023

    • Author(s)
      Yokoyama T.、Matsuyama A.、Yamamoto Y.、Miyamoto S.、Shibata Y.、Inoue S.、Kojima S.、Nakamura S.、Wakatsuki T.、Yoshida M.
    • Journal Title

      Nuclear Fusion

      Volume: 63 Issue: 12 Pages: 126049-126049

    • DOI

      10.1088/1741-4326/ad0507

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Density and temperature profiles after low-Z and high-Z shattered pellet injections on DIII-D2023

    • Author(s)
      Lvovskiy A.、Matsuyama A.、O’Gorman T.、Shiraki D.、Herfindal J.L.、Hollmann E.M.、Marini C.、Boivin R.、Eidietis N.W.、Lehnen M.
    • Journal Title

      Nuclear Fusion

      Volume: 64 Issue: 1 Pages: 016002-016002

    • DOI

      10.1088/1741-4326/ad0905

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A comparison of the influence of plasmoid-drift mechanisms on plasma fuelling by cryogenic pellets in ITER and Wendelstein 7-X2023

    • Author(s)
      Panadero N.、Koechl F.、Polevoi A.R.、Baldzuhn J.、Beidler C.D.、Lang P.T.、Loarte A.、Matsuyama A.、McCarthy K.J.、Pegourie B.、Turkin Y.
    • Journal Title

      Nuclear Fusion

      Volume: 63 Issue: 4 Pages: 046022-046022

    • DOI

      10.1088/1741-4326/acbc34

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 「地上の太陽」を制御する - 突発現象(ディスラプション)のシミュレーション2023

    • Author(s)
      松山顕之
    • Journal Title

      日本シミュレーション学会誌

      Volume: 41 Pages: 205-211

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Observation of Electron Density Rollover in Hydrogen Plasma Produced with DT-ALPHA Device2022

    • Author(s)
      YOSHIMURA Keigo、TAKAHASHI Hiroyuki、SEINO Tomohiro、KUSABIRAKI Kaoru、SAKATA Yuki、NISHIMURA Ryota、MATSUYAMA Akinobu、TOBITA Kenji
    • Journal Title

      Plasma and Fusion Research

      Volume: 17 Issue: 0 Pages: 1201082-1201082

    • DOI

      10.1585/pfr.17.1201082

    • ISSN
      1880-6821
    • Year and Date
      2022-06-22
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Results of ITER DMS Pellet Material (Neon) Injection into Large Helical Device2022

    • Author(s)
      Akinobu Matsuyama, Ryuichi Sakamoto
    • Journal Title

      Plasma and Fusion Research

      Volume: 17 Issue: 0 Pages: 2402017-2402017

    • DOI

      10.1585/pfr.17.2402017

    • ISSN
      1880-6821
    • Year and Date
      2022-03-30
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Modelling of ohmic startup and runaway electron formation in support of JT-60SA initial operation2022

    • Author(s)
      Matsuyama A.、Wakatsuki T.、Inoue S.、Yamamoto Y.、Yoshida M.、Urano H.
    • Journal Title

      Nuclear Fusion

      Volume: 63 Issue: 2 Pages: 026001-026001

    • DOI

      10.1088/1741-4326/aca77a

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Enhanced Material Assimilation in a Toroidal Plasma Using Mixed H2+Ne Pellet Injection and Implications to ITER2022

    • Author(s)
      Matsuyama A.、Sakamoto R.、Yasuhara R.、Funaba H.、Uehara H.、Yamada I.、Kawate T.、Goto M.
    • Journal Title

      Physical Review Letters

      Volume: 129 Issue: 25

    • DOI

      10.1103/physrevlett.129.255001

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Transport simulations of pre-thermal quench shattered pellet injection in ITER: code verification and assessment of key trends2022

    • Author(s)
      Matsuyama A、Hu D、Lehnen M、Nardon E、Artola J
    • Journal Title

      Plasma Physics and Controlled Fusion

      Volume: 64 Issue: 10 Pages: 105018-105018

    • DOI

      10.1088/1361-6587/ac89b2

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Neutral gas and plasma shielding (NGPS) model and cross-field motion of ablated material for hydrogen-neon mixed pellet injection2022

    • Author(s)
      Akinobu Matsuyama
    • Journal Title

      Physics of Plasmas

      Volume: 29 Issue: 4 Pages: 042501-042501

    • DOI

      10.1063/5.0084586

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Post-thermal-quench shattered pellet injection for runaway electron seed depletion in ITER2021

    • Author(s)
      E. Nardon, A. Matsuyama, D. Hu, F. Wieschollek
    • Journal Title

      Nuclear Fusion

      Volume: 62 Issue: 2 Pages: 026003-026003

    • DOI

      10.1088/1741-4326/ac3ac6

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Mixed hydrogen-neon pellet injection in toroidal plasmas - theory and observation2023

    • Author(s)
      Akinobu Matsuyama
    • Organizer
      7th Annual Conference of AAPPS-DPP (AAPPS-DPP2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 固体水素ペレットと環状磁化プラズマの相互作用の物理2023

    • Author(s)
      松山顕之
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] トカマクディスラプションに伴う電流減衰中のエネルギーバランスの数値解析2023

    • Author(s)
      松山顕之、横山達也
    • Organizer
      第40回プラズマ・核融合学会年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] ITER ディスラプション緩和装置開発に向けたプラズマ物理研究の進展2022

    • Author(s)
      松山顕之
    • Organizer
      第 39 回プラズマ・核融合学会年会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Cryogenic Pellet Ablation Physics and Integrated Modelling of Shattered Pellet Injection2022

    • Author(s)
      Akinobu Matsuyama
    • Organizer
      2nd IAEA Technical Meeting on Plasma Disruptions and their Mitigation
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Ablation and assimilation of massively injected cryogenic pellets in tokamak plasmas2021

    • Author(s)
      Akinobu Matsuyama
    • Organizer
      AAPPS-DPP2021 (5th Asia Pacific Conference on Plasma Physics)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 世界最大の核融合実験炉に必要とされるプラズマ冷却技術の研究が進展(QSTプレスリリース)

    • URL

      https://www.qst.go.jp/site/press/20221223.html

    • Related Report
      2022 Annual Research Report
  • [Remarks] 世界最大の核融合実験炉に必要とされるプラズマ冷却技術の研究が進展(NIFSプレスリリース)

    • URL

      https://www.nifs.ac.jp/news/collabo/221223.html

    • Related Report
      2022 Annual Research Report

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

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