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Investigation of plasma confinement transition in toroidal system by active control of poloidal flow

Research Project

Project/Area Number 20K03911
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 InstitutionNational Institute for Fusion Science

Principal Investigator

Takahashi Hiromi  核融合科学研究所, ヘリカル研究部, 准教授 (00462193)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords電極バイアス / ポロイダル粘性 / 径電場 / 閉じ込め改善 / 核融合プラズマ
Outline of Research at the Start

本研究では、装置サイズや磁場リップル構造が大きく異なるプラズマ閉じ込め装置間において、電極バイアス実験を行い、ポロイダル粘性のフロー依存性や閉じ込め遷移に必要なポロイダルトルクの大きさを網羅的に評価する。本研究によって、理論・実験の双方で定量評価された粘性の系統的な比較が初めて可能となり、新古典ポロイダルイオン粘性の非線形性がトロイダルプラズマの閉じ込め改善モード遷移に対して担う役割が明らかになる。

Outline of Final Research Achievements

For the control of electric field and viscosity in toroidal field devices, construction of an electrode biasing system and electric field control experiments were carried out in the TJ-II in Spain. Although there were delays in the plan due to COVID-19, the unexpected results were obtained, including the observation of differences in the effects of electrode bias on ExB transport due to turbulence and ExB transport due to AE modes. In addition, in a rotational transformation scan experiment under electrode biasing, it was found that the poloidal flow velocity (radial electric field) has a radial structure that is clearly related to the rotational transform profile, especially the low-order rational surface. Furthermore, in order to further develop this research in the future, we have spearheaded a programme of controlled electric field experiments on the CFQS at Southwest Jiaotong University, China.

Academic Significance and Societal Importance of the Research Achievements

制御熱核融合炉の実現を指向とするトロイダル磁場閉じ込めプラズマ研究領域において、プラズマ中の電場、あるいは、フローはプラズマの熱閉じ込め性能を決定づける最も重要な物理量である。本研究において、電極バイアスによる電場制御下における特徴的な輸送の振る舞いや、磁場構造に強く関連したプラズマの構造形成を観測した。これらの研究成果は実験を行ったTJ-II装置でのみ得られたものであるが、今後、閉じ込め磁場構造の異なる他のプラズマ実験装置において、実験結果の蓄積とデータベース化を行い、メカニズムの定式化ができれば、電場やフロー、さらには、閉じ込め性能を機能的に制御する手段の確立につながる。

Report

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

    (11 results)

All 2022 2021 Other

All Int'l Joint Research (4 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (2 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] 国立エネルギー環境技術研究センター(スペイン)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] 西南交通大学(中国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] 国立エネルギー環境技術研究センター(スペイン)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] 国立エネルギー環境技術研究センター(スペイン)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Prediction of Neutron Emission Rate in Deuterium Neutral Beam Heated CFQS Plasmas Using FIT3D-DD Code2022

    • Author(s)
      R. SEKI, K. OGAWA, M. ISOBE, S. MURAKAMI, H. TAKAHASHI, 他11名
    • Journal Title

      Plasma and Fusion Research

      Volume: 17 Issue: 0 Pages: 2403063-2403063

    • DOI

      10.1585/pfr.17.2403063

    • ISSN
      1880-6821
    • Year and Date
      2022-06-22
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Investigation of Capability of Current Control by Electron Cyclotron Waves in the Quasiaxisymmetric Stellarator CFQS2022

    • Author(s)
      Y. YOSHIMURA, M. KANDA, R. YANAI, A. SHIMIZU, H. TAKAHASHI, 他9名
    • Journal Title

      Plasma and Fusion Research

      Volume: 17 Issue: 0 Pages: 2402039-2402039

    • DOI

      10.1585/pfr.17.2402039

    • ISSN
      1880-6821
    • Year and Date
      2022-05-13
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Feasibility study of heavy ion beam probe in CFQS quasi-axisymmetric stellarator2022

    • Author(s)
      A. Shimizu, M. Isobe, S. Okamura, S. Kinoshita, H. Takahashi, 他12名
    • Journal Title

      Journal of Instrumentation

      Volume: 17 Issue: 06 Pages: C06004-C06004

    • DOI

      10.1088/1748-0221/17/06/c06004

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas2022

    • Author(s)
      C. Hidalgo, E. Ascasibar, U. Losada, S. Ohshima, H. Takahashi 他130名
    • Journal Title

      Nuclear Fusion

      Volume: 62 Issue: 4 Pages: 042025-042025

    • DOI

      10.1088/1741-4326/ac2ca1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas2021

    • Author(s)
      C. Hidalgo, E. Ascasibar, U. Losada, S. Ohshima, H. Takahashi 他130名
    • Organizer
      28th IAEA Fusion Energy Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] OVERVIEW OF THE TJ-II STELLARATOR RESEARCH PROGRAMME TOWARDS MODEL VALIDATION IN FUSION PLASMAS2021

    • Author(s)
      C. Hidalgo et al.
    • Organizer
      28th IAEA Fusion Energy Conference (FEC 2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Remarks] 高橋 裕己|研究活動 / 核融合科学研究所

    • URL

      https://unit.nifs.ac.jp/research/archives/staff/staff-813?paper=TakahashiHiromi&unit=unit02&unitpage=75

    • Related Report
      2022 Annual Research Report

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

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