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Simulation study on impact of toroidal rotation on L-H transition

Research Project

Project/Area Number 16K18342
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Nuclear fusion studies
Research InstitutionNational Institutes for Quantum and Radiological Science and Technology

Principal Investigator

Seto Haruki  国立研究開発法人量子科学技術研究開発機構, 六ヶ所核融合研究所 核融合炉システム研究開発部, 主任研究員(任常) (90733692)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
KeywordsL-H遷移 / プラズマ乱流 / 径電場 / 数値シミュレーション / 周辺プラズマ安定性 / トカマクプラズマ / エッジプラズマ / 非線形シミュレーション / 簡約化MHDモデル / 周辺局在化モード / L/H遷移 / 数値手法開発 / エッジーロカライズドモード / 非理想バルーニングモード不安定性 / シミュレーション
Outline of Final Research Achievements

For more quantitative understanding of the mechanism of L-H transition (a bifurcation phenomenon that improves plasma confinement performance) in high-beta magnetic confinement fusion devices such as ITER and DEMO, a numerical calculation code that can self-consistently simulate macroscopic electromagnetic field non-linearly generated by plasma turbulence is developed. Here a self-consistent interplay between macroscopic electromagnetic field and turbulence plays important role in numerical simulation of L-H transition.
As a proof of principle of the code, simulations of pedestal collapse are carried out. Here, the term "pedestal collapse" means a relaxation of steep plasma profile in the edge region in high confinement discharge due to edge localized modes. It is revealed that subsequent small energy releases triggered by an interplay between macroscopic electromagnetic field and plasma turbulence are observed after the primary pedestal collapse and rise energy loss level.

Academic Significance and Societal Importance of the Research Achievements

L-H遷移の数値シミュレーションに必要となる微視的なプラズマ乱流とプラズマ乱流から生成される巨視的な流れと磁場から構成されるマルチスケールの物理を自己無撞着に取り扱う数値手法を本課題では開発した。マルチスケールの物理を取り扱う数値手法の構築はプラズマ科学全般において非線形物理を取り扱う上で重要であり、他のプラズマシミュレーション研究への展開が期待できる。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (25 results)

All 2020 2019 2018 2017 2016 Other

All Int'l Joint Research (4 results) Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 3 results,  Acknowledgement Compliant: 1 results) Presentation (16 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results)

  • [Int'l Joint Research] University of York(英国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Lawrence Livermore National Laboratory(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Lawrence Livermore National Laboratory(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] University of York(英国)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Impact of equilibrium radial electric field on energy loss process after pedestal collapse2020

    • Author(s)
      Seto Haruki、Xu X.Q.、Dudson Benjamin D.、Yagi Masatoshi
    • Journal Title

      Contributions to Plasma Physics

      Volume: Early View Issue: 5-6

    • DOI

      10.1002/ctpp.201900158

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Interplay between fluctuation driven toroidal axisymmetric flows and resistive ballooning mode turbulence2019

    • Author(s)
      Seto H.、Xu X. Q.、Dudson B. D.、Yagi M.
    • Journal Title

      Physics of Plasmas

      Volume: 26 Issue: 5 Pages: 052507-052507

    • DOI

      10.1063/1.5086998

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Shaping Effects on Non-Ideal Ballooning Mode2018

    • Author(s)
      SETO Haruki、YAGI Masatoshi、AIBA Nobuyuki、MATSUYAMA Akinobu、DUDSON Benjamin D.、XU Xueqiao
    • Journal Title

      Plasma and Fusion Research

      Volume: 13 Issue: 0 Pages: 3403086-3403086

    • DOI

      10.1585/pfr.13.3403086

    • NAID

      130007472553

    • ISSN
      1880-6821
    • Year and Date
      2018-07-10
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Validation Study On Upwinding Schemes For Core MHD/Turbulent Simulation2017

    • Author(s)
      Haruki SETO, Masatoshi YAGI
    • Journal Title

      International Conference Proceeding of MC2017

      Volume: -

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Non-Ideal Ballooning Mode Instability with Real Electron Inertia2016

    • Author(s)
      Haruki SETO, Masatoshi YAGI, Nobuyuki AIBA, Akinobu Matsuyama, Benjamin D. DUDSON, Xueqiao Xu
    • Journal Title

      Plasma and Fusion Research

      Volume: 11 Issue: 0 Pages: 1203122-1203122

    • DOI

      10.1585/pfr.11.1203122

    • NAID

      130005311671

    • ISSN
      1880-6821
    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Simulation study on ELMs by BOUT++ framework including toroidal axisymmetric flow and magnetic field driven by short wave- length instabilities2019

    • Author(s)
      H. Seto, X.Q. Xu, B.D. Dudson, M. Yagi
    • Organizer
      17th International Workshop on Plasma Edge Theory in Fusion Devices (PET17)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Simulation study on impact of pedestal height on energy loss process with resistive ballooning mode turbulence during pedestal collapse2019

    • Author(s)
      H. Seto, X.Q. Xu, B.D. Dudson and X.Q. Xu
    • Organizer
      16th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems - Theory of Plasma Instabilities
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 圧力勾配駆動型周辺局在化モードの非線形シミュレーション研究の進展2019

    • Author(s)
      瀬戸春樹
    • Organizer
      第36回プラズマ・核融合学会年会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Numerical improvement in BOUT++ framework for multiple mode ELM crash simulation including off-resonant modes and its application2019

    • Author(s)
      H. Seto, X.Q. Xu, B.D. Dudson, M. Yagi
    • Organizer
      The 5th UNIST-Kyoto U. Workshop on “Physics validation and control of MHD instabilities and turbulent transport in fusion plasmas"
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 軸対称モードの流れと磁場の時間発展を取り入れた抵抗性バルーニングモード駆動型ELMのシミュレーション研究2019

    • Author(s)
      瀬戸春樹, X.Q. Xu, B.D. Dudson, 矢木雅敏
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] ELM crash with nonlinear toroidally axisymmetric flow and field2018

    • Author(s)
      H. Seto. X.Q. Xu, B.D. Dudson, M. Yagi
    • Organizer
      2018 BOUT++ workshop
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ELM crash with nonlinear toroidally axisymmetric flow and field2018

    • Author(s)
      H. Seto. X.Q. Xu, B.D. Dudson, M. Yagi
    • Organizer
      AAPPS-DPP 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] イオン反磁性モデルがペデスタル崩壊過程に与える影響に関するシミュレーション2018

    • Author(s)
      瀬戸春樹, X.Q. Xu, B.D. Dudson, 矢木雅敏
    • Organizer
      第35回プラズマ・核融合学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Linear Analysis of Shaping Effects on Non-ideal Ballooning Mode Instability2017

    • Author(s)
      Haruki SETO, Masatoshi YAGI, Nobuyuki AIBA, Akinobu MATSUYAMA, Benjamin D. Dudson, Xueqiao XU
    • Organizer
      Joint meeting of 26th International Toki Conference and 11th Asia Plasma & Fusion Association Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 対流胞(径電場シア)形成が圧力ペデスタル崩壊時のエネルギー放出量に与える影響の数値的検証2017

    • Author(s)
      瀬戸春樹、矢木正敏
    • Organizer
      輸送・閉じ込め研究会2017
    • Related Report
      2017 Research-status Report
  • [Presentation] 対流胞(径電場シア)形成が圧力ペデスタル崩壊時のエネルギー放出量に与える影響の数値的検証2017

    • Author(s)
      瀬戸春樹、矢木正敏
    • Organizer
      平成29年度NIFS共同研究研究会「MHDシミュレーションのための先進的数値計算手法」
    • Related Report
      2017 Research-status Report
  • [Presentation] Validation Study on Upwinding Scheme for Core MHD/Turbulent Simulation2017

    • Author(s)
      Haruki SETO, Masatoshi Yagi
    • Organizer
      International Conference on Mathematics & Computational Methods Applied to Nuclear Science & Engineering
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Linear analysis of collision less ballooning mode instability based on reduced MHD model2016

    • Author(s)
      Haruki SETO
    • Organizer
      BOUT++ workshop 2016
    • Place of Presentation
      York Plasma Institute, York, UK
    • Related Report
      2016 Research-status Report
  • [Presentation] 簡約化MHDモデルに基づく無衝突バルーニングモード不安定性の線形解析(1)2016

    • Author(s)
      矢木雅敏、瀬戸春樹
    • Organizer
      プラズマ・核融合学会第33回年会
    • Place of Presentation
      東北大学青葉山キャンパス、仙台市
    • Related Report
      2016 Research-status Report
  • [Presentation] 簡約化MHDモデルに基づく無衝突バルーニングモード不安定性の線形解析(2)2016

    • Author(s)
      瀬戸春樹、矢木雅敏
    • Organizer
      プラズマ・核融合学会第33回年会
    • Place of Presentation
      東北大学青葉山キャンパス、仙台市
    • Related Report
      2016 Research-status Report
  • [Presentation] Linear analysis of non-ideal ballooning mode instability with real electron inertia2016

    • Author(s)
      瀬戸春樹、矢木雅敏
    • Organizer
      第14回核燃焼プラズマ統合コード研究会
    • Place of Presentation
      九州大学応用力学研究所、春日市
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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