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Effects of impurity screening by stochastic magnetic field on tungsten transport in ITER edge plasmas

Research Project

Project/Area Number 17K14426
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Plasma science
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Oishi Tetsutarou  核融合科学研究所, ヘリカル研究部, 助教 (80442523)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords不純物輸送 / タングステン / 真空紫外分光 / ITER / 周辺プラズマ / プラズマ・核融合
Outline of Final Research Achievements

The impurity screening effect is caused by the edge stochastic magnetic field layer in magnetically-confined plasmas. In this study, the experimental conditions in which the impurity screening is effective on the tungsten ions were explored in the Large Helical Device (LHD). Plasma discharge parameter survey on sustain or collapse against tungsten injection, experimental verification on a theoretical impurity transport model based on the parallel momentum balance, and multi-wavelength spectroscopic diagnostics for tungsten ions from low to high charge states were conducted.

Academic Significance and Societal Importance of the Research Achievements

タングステンが不純物イオンとしてプラズマ中に蓄積すると,74という高原子番号のため線放射によるエネルギー損失が大きくなる.この蓄積現象は,タングステンが金属表面から中性原子として放出され,低温の周辺プラズマで低電離状態のイオンとして輸送され,高温のコアプラズマに高電離状態のイオンとして蓄積する,という過程を経由する.従って,周辺プラズマにおける不純物遮蔽現象がタングステンの輸送に及ぼす影響の研究は,タングステン蓄積の制御へ向けた可能性を開拓するものである.

Report

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

    (19 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (13 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] ASIPP(中国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Doppler profile diagnostics on VUV spectra for the impurity ion temperature in edge plasmas of Large Helical Device2019

    • Author(s)
      T.Oishi, S.Morita, S.Y.Dai, M.kobayashi, G.Kawamura, Y.Liu and M.Goto
    • Journal Title

      Journal of Physics Conference Series

      Volume: 1289 Issue: 1 Pages: 012037-012037

    • DOI

      10.1088/1742-6596/1289/1/012037

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Response of Plasmas to Tungsten Pellet Injection in Neutral Beam Heated Discharges in Large Helical Device2018

    • Author(s)
      OISHI Tetsutarou、MORITA Shigeru、HUANG Xianli、LIU Yang、GOTO Motoshi、the LHD Experiment Group
    • Journal Title

      Plasma and Fusion Research

      Volume: 13 Issue: 0 Pages: 3402031-3402031

    • DOI

      10.1585/pfr.13.3402031

    • NAID

      130007396443

    • ISSN
      1880-6821
    • Year and Date
      2018-04-24
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Observation of carbon impurity flow in the edge stochastic magnetic field layer of Large Helical Device and its impact on the edge impurity control2017

    • Author(s)
      Oishi T.、Morita S.、Dai S.Y.、Kobayashi M.、Kawamura G.、Huang X.L.、Zhang H.M.、Liu Y.、Goto M.、the LHD Experiment Group
    • Journal Title

      Nuclear Fusion

      Volume: 58 Issue: 1 Pages: 016040-016040

    • DOI

      10.1088/1741-4326/aa8f63

    • NAID

      120007119914

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of impurity source locations on up-down asymmetry in impurity distributions in the ergodic layer of large helical device2017

    • Author(s)
      Oishi Tetsutarou、Morita Shigeru、Huang Xianli、Zhang Hongming、Liu Yang、Dai Shuyu、Kobayashi Masahiro、Kawamura Gakushi、Goto Motoshi
    • Journal Title

      Nuclear Materials and Energy

      Volume: 12 Pages: 762-767

    • DOI

      10.1016/j.nme.2017.04.002

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] LHDの真空紫外波長域における高電離タングステンイオンの禁制線の探索2020

    • Author(s)
      大石鉄太郎,森田繁,加藤太治,村上泉,坂上裕之,川本靖子,後藤基志,LHD実験グループ
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Temporal Evolution of Emissions from Tungsten Ions in Various Charge States Observed in Impurity Pellet Injection Experiments in Large Helical Device2019

    • Author(s)
      T. Oishi, S. Morita, D. Kato, I. Murakami, H. A. Sakaue, Y. Kawamoto, M. Goto and the LHD Experiment group
    • Organizer
      The 28th International Toki Conference on Plasma and Fusion Research
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study of Impurity Transport in Deuterium and Hydrogen Plasmas in the Edge Stochastic Magnetic Field Layer of Large Helical Device2019

    • Author(s)
      T. Oishi, S. Morita, M. Kobayashi, G. Kawamura, Y. Kawamoto, M. Goto and the LHD Experiment Group
    • Organizer
      46th European Physical Society Conference on Plasma Physics (EPS2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LHDの周辺部統計的磁場領域での不純物輸送における背景プラズマの同位体効果2019

    • Author(s)
      大石鉄太郎,森田繁,小林政弘,河村学思,川本靖子,後藤基志,LHD実験グループ
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] LHDの周辺部統計的磁場領域における不純物遮蔽効果への重水素プラズマの影響2019

    • Author(s)
      大石鉄太郎,森田繁,小林政弘,河村学思,川本靖子,後藤基志,LHD実験グループ
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Study of Carbon Impurity Transport in Deuterium and Hydrogen Plasmas in the Edge Ergodic Layer of Large Helical Device2018

    • Author(s)
      T. Oishi, S. Morita, M. Kobayashi, G. Kawamura, Y. Liu, Y. Kawamoto, M. Goto and the LHD Experiment group
    • Organizer
      The 27th International Toki Conference on Plasma and Fusion Research & The 13th Asia Pacific Plasma Theory Conference
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effect of deuterium plasmas on carbon impurity transport in the edge stochastic magnetic field layer of Large Helical Device2018

    • Author(s)
      T. Oishi, S. Morita, M. Kobayashi, G. Kawamura, Y. Liu, M. Goto and the LHD Experiment group
    • Organizer
      The 27th IAEA Fusion Energy Conference
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Doppler Profile Diagnostics on VUV Spectra for Emission Intensity, Ion Temperature and Flow Velocity of Impurity Ions in Edge Plasmas of Large Helical Device2018

    • Author(s)
      Tetsutarou Oishi, Shigeru Morita, Yang Liu, Motoshi Goto and the LHD Experiment Group
    • Organizer
      24th International Conference on Spectral Line Shapes
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] LHDの統計的磁場領域がもたらす 不純物制御の新展開2018

    • Author(s)
      大石鉄太郎,森田繁,戴舒宇,小林政弘,河村学思,劉洋,川本靖子,後藤基志,LHD実験グループ
    • Organizer
      プラズマ・核融合学会第35回年会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] LHDの周辺部統計的磁場領域における炭素不純物フローへの重水素プラズマの影響2018

    • Author(s)
      大石鉄太郎,森田繁,小林政弘,河村学思,劉洋,川本靖子,後藤基志,LHD実験グループ
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] LHDの周辺部統計的磁場領域における炭素不純物フローの不純物輸送への影響2018

    • Author(s)
      大石鉄太郎,森田繁,戴舒宇,小林政弘,河村学思,劉洋,後藤基志,LHD実験グループ
    • Organizer
      日本物理学会第73回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Response of plasmas to tungsten pellet injection in neutral beam heated discharges in Large Helical Device2017

    • Author(s)
      T. Oishi, S. Morita, X. L. Huang, Y. Liu, M. Goto and the LHD Experiment group
    • Organizer
      Joint meeting of the 26th International Toki Conference (ITC-26) and The 11th Asia Plasma and Fusion Association Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Observation of carbon impurity flow in the edge stochastic magnetic field layer of Large Helical Device and its dependence on the magnetic field configuration2017

    • Author(s)
      Tetsutarou Oishi, Shigeru Morita, Shuyu Dai, Masahiro Kobayashi, Gakushi Kawamura, Xianli Huang, Yang Liu, Motoshi Goto and the LHD Experiment group
    • Organizer
      Plasma Conference 2017 (PLASMA2017)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 研究活動状況 プラズマから「流れ去る」不純物-不純物遮蔽効果の分光計測による観測-

    • URL

      http://www.nifs.ac.jp/lhdreport/mailinfo_297.html

    • Related Report
      2017 Research-status Report

URL: 

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

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