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Studies of wave-particle interactions with internal magnetic field measurements in a lower-hybrid wave driven tokamak plasma

Research Project

Project/Area Number 18K13524
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionThe University of Tokyo

Principal Investigator

Tsujii Naoto  東京大学, 大学院新領域創成科学研究科, 講師 (20707351)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsトカマク / 低域混成波 / 電流駆動 / マイクロ波偏光計 / 拡張電磁流体力学 / 拡張MHD / 球状トカマク / 高周波電流駆動 / 内部磁場計測 / RF電流駆動 / 核融合プラズマ / 偏光計
Outline of Final Research Achievements

We have developed a microwave polarimeter to measure the current profile driven by lower-hybrid waves, and understand how the waves generate a tokamak plasma. As a more theoretical approach, we have also developed an equilibrium analysis code based on the extended magneto-hydrodynamics including the fast electrons. We have found that the fast electrons generated by the waves indeed affect the equilibrium by using the new equilibrium analysis code together with the magnetic and Thomson scattering diagnostics. On the other hand, for the polarimetry development, we were not able to detect the small change of polarization induced by the plasma. We will continue to improve the diagnostic by reducing the noise and enhancing the signal intensity.

Academic Significance and Societal Importance of the Research Achievements

低域混成波を含む高周波を用いたトカマクプラズマ生成においては、波動が高速電子を生成し、高速電子が作る電流が系全体の電磁流体力学的平衡を決める。さらに、プラズマの平衡配位は波動の伝搬・吸収や高速電子輸送に影響を与える。この波動・高速電子・プラズマの相互作用により、自律的にトカマク配位が形成されることが実験的には分かっている。この過程を定量的に理解することで、高周波によるトカマクプラズマ生成・駆動の効率を改善することができる。本研究では、高速電子とプラズマの相互作用の理解を進めることができた。トカマクの高周波駆動手法が確立できれば、核融合炉の効率を改善し、定常運転の問題を解決できる可能性がある。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Studies of a Lower-Hybrid Wave Driven Plasma Equilibrium with a Hybrid-MHD Model on the TST-2 Spherical Tokamak2020

    • Author(s)
      TSUJII Naoto、YOSHIDA Yusuke、TAKASE Yuichi、EJIRI Akira、WATANABE Osamu、YAMAZAKI Hibiki、PENG Yi、IWASAKI Kotaro、AOI Yuki、KO Yongtae、MATSUZAKI Kyohei、RICE James H.P.、OSAWA Yuki
    • Journal Title

      Plasma and Fusion Research

      Volume: 15 Issue: 0 Pages: 2402010-2402010

    • DOI

      10.1585/pfr.15.2402010

    • NAID

      130007840526

    • ISSN
      1880-6821
    • Year and Date
      2020-04-06
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] MODIFICATION OF THE MAGNETO-HYDRO-DYNAMIC EQUILIBRIUM BY THE LOWER-HYBRID WAVE DRIVEN FAST ELECTRONS ON THE TST-2 SPHERICAL TOKAMAK2021

    • Author(s)
      N. TSUJII, Y. TAKASE, A. EJIRI, O. WATANABE, H. YAMAZAKI, Y. PENG, K. IWASAKI, Y. AOI, Y. KO, K. MATSUZAKI, J.H.P. RICE and Y. OSAWA
    • Organizer
      IAEA FEC
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of a microwave polarimeter for current profile measurement of lower-hybrid driven plasma on TST-22020

    • Author(s)
      TSUJII Naoto, TAKASE Yuichi, EJIRI Akira, WATANABE Osamu, PENG Yi, IWASAKI Kotaro, KO Yongtae, RICE James, OSAWA Yuki, YATOMI Go and YAMADA Iwao
    • Organizer
      プラズマ核融合学会
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modeling of the lower-hybrid wave driven plasma equilibrium with a hybrid-MHD model on the TST-2 spherical tokamak2019

    • Author(s)
      N. Tsujii
    • Organizer
      The 28th International Toki Conference
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of a microwave polarimeter for the measurement of the lower-hybrid driven current profile on the TST-2 spherical tokamak2018

    • Author(s)
      N. Tsujii, Y. Takase, A. Ejiri, O. Watanabe, S. Yajima, Y. Yoshida, H. Yamazaki, Y. Iida, K. Iwasaki, Y. Kawamata, S. Sakamoto
    • Organizer
      アメリカ物理学会
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] TST-2の非誘導立ち上げプラズマにおける偏光計の開発2018

    • Author(s)
      辻井直人,高瀬雄一,渡邉理,矢嶋悟,吉田裕亮,山崎響,飯田勇介,岩崎光太郎,川又裕也,坂本将,青井優樹,高竜太,松崎享平
    • Organizer
      プラズマ・核融合学会年会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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