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Modeling of meniscus formed in negative-ion-rich plasmas and its application to negative ion beam acceleration

Research Project

Project/Area Number 17K14903
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Kisaki Masashi  核融合科学研究所, ヘリカル研究部, 助教 (70598945)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords負イオンビーム / メニスカス / 中性粒子ビーム / 負イオン密度 / ビーム引出界面 / 負イオン源 / NBI / ビーム光学 / シース / イオン性プラズマ / 引出界面 / 負性プラズマ / ビーム加速
Outline of Final Research Achievements

In our recent study, it was clarified that the plasmas in negative ion sources for fusion consist of mainly positive and negative ions with small fraction of electrons. In this study, shielding effect of an applied electric field on ionic plasmas and mechanism of a meniscus formation were investigated by experiments and simulations. As a result, it was confirmed that the contribution of the electron to shielding of the applied electric field is minor, and that the negative ion density plays an important role for meniscus formation.

Academic Significance and Societal Importance of the Research Achievements

本研究は核融合発電を実現する上で要となる中性粒子ビーム入射加熱装置の高性能化に関する研究である。核融合炉に必要とされる中性粒子ビームは 1 MeV を超える高エネルギービームであり、プラズマに入射するまでに長距離輸送しなければならず、ビーム損失を抑えるために発散角の小さい良質のビームを生成することが最重要課題である。本研究では、ビームの広がりを決める初段の静電レンズである、負イオン引出界面の形状を制御する鍵となるプラズマパラメータが負イオン密度であることを初めて見出した。これにより、核融合炉用負イオン源に要求される低発散ビームの実現に向けて、研究開発への指針が明確になった。

Report

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

    (9 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (5 results) Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)

  • [Int'l Joint Research] IPP Garching(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Consorzio RFX(イタリア)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Consorzio RFX(イタリア)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Consorzio RFX(Italy)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] IPP Garching(Germany)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Study of correlation between plasma parameter and beam optics2020

    • Author(s)
      Kisaki M.、Nakano H.、Tsumori K.、Ikeda K.、Masaki S.、Haba Y.、Fujiwara Y.、Nagaoak K.、Osakabe M.
    • Journal Title

      Review of Scientific Instruments

      Volume: 91 Issue: 2 Pages: 023503-023503

    • DOI

      10.1063/1.5131102

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Demonstration of Beam Optics Optimization Using Plasma Grid Bias in a Negative Ion Source2018

    • Author(s)
      KISAKI Masashi、IKEDA Katsunori、NAKANO Haruhisa、TSUMORI Katsuyoshi、FUJIWARA Yutaka、HABA Yasuaki、KAMIO Shuji、NAGAOKA Kenichi、OSAKABE Masaki
    • Journal Title

      Plasma and Fusion Research

      Volume: 13 Issue: 0 Pages: 1205110-1205110

    • DOI

      10.1585/pfr.13.1205110

    • ISSN
      1880-6821
    • Year and Date
      2018-09-10
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Study of correlation between plasma parameter and beam optics2019

    • Author(s)
      M. Kisaki, H. Nakano, K. Tsumori, K. Ikeda, S. Masaki, Y. Haba, Y. Fujiwara, K. Nagaoka, M. Osakabe
    • Organizer
      18th International Conference On Ion Sources
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of plasma grid bias on negative ion beam optics2017

    • Author(s)
      M. Kisaki, K. Tsumori, K. Ikeda, H. Nakano, Y. Haba, Y. Fujiwara, S. Kamio, K. Nagaoka, and M. Osakabe
    • Organizer
      17th International Conference on ion Sources
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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