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2020 Fiscal Year Annual Research Report

Quantitative evaluation of ionization, recombination and cooling rate of tungsten for transport study and density analysis

Research Project

Project/Area Number 16H04088
Research InstitutionNational Institute for Fusion Science

Principal Investigator

森田 繁  核融合科学研究所, その他部局等, 名誉教授 (80174423)

Co-Investigator(Kenkyū-buntansha) 大石 鉄太郎  東北大学, 工学研究科, 准教授 (80442523)
Project Period (FY) 2016-04-01 – 2021-03-31
Keywordsプラズマ核融合 / タングステン / プラズマ分光 / EUV分光 / 疑似連続光 / 放射損失 / 電離再結合 / 原子物理
Outline of Annual Research Achievements

令和4年10月-12月の3か月間,LHDで軽・重水素実験を実施した.令和3年までのLHD実験では,金属不純物流入束の抑制を目指して外部RMP磁場印可による磁気島生成を利用した研究を実施したが,令和4年度の実験では,バルク水素イオンの輸送に関する外部RMP磁場の影響を調べた.LHDでは,NBIの加熱入力を減少させると周辺プラズマの温度が低下し,統計的地場領域での粒子流入束遮蔽効果が弱くなる.特に,磁気軸を外側にシフトさせた外寄せプラズマでは統計的地場領域が拡大するため,温度低下による遮蔽効果の抑制は顕著になる.そこで,上記の実験をRax=3.65-75m配位で実施した.放電途中でNBI加熱入力を減少させると遮蔽効果抑制による密度上昇が始まる.放電の最後まで密度は上昇し続ける(2から5x1013cm-3へ).この放電にRMP磁場を印加すると密度上昇は2.5x1013cm-3付近で止まり,放電終了まで一定値を示す.周辺磁気島形成がコア部へのバルクイオン流入を抑制することが明らかになった.現在,これまでの一連のRMP磁場形成に関する実験結果を整理している.多価イオン分光に関する最近の進展をJ. Atomic, Molecular, Condensed Matter and Nano Physicsに投稿し,論文掲載が受理された.
EAST装置(中国・合肥・等離子体物理研究所)での共同研究を電子メイルやZoomを通して継続した.金属スペクトルの高速空間分布計測用EUV分光器の開発に関して新規CMOS検出器を導入して行った.10-20msという時間分解で空間分布スペクトルを計測することに成功し,鋸歯状振動中に変化するタングステン不純物イオン分布を観測した.結果をRSI誌に,EAST放電での不純物挙動に関する実験結果をMPDI-Applied Science誌に公表した.

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

  • Research Products

    (18 results)

All 2023 2022 2021

All Journal Article (14 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 14 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Recent progress on atomic spectroscopy of highly ionized ions in laboratory plasmas for fusion research2023

    • Author(s)
      S.Morita, T.Oishi, L.Zhang, C.F.Dong, X.L.Huang, H.M.Zhang and M.Goto
    • Journal Title

      Journal of Atomic, Molecular, Condensed Matter and Nano Physics

      Volume: 10 Pages: -

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] EUV spectral shape variation of tungsten unresolved transition arrays in electron temperature range of 2 - 4 keV observed in the Large Helical Device2023

    • Author(s)
      T.Oishi, S.Morita, I.Murakami, D.Kato, H.A.Sakaue, Y.Kawamoto, T.Kawate and M.Goto
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2439 Pages: 012005-1-4

    • DOI

      10.1088/1742-6596/2439/1/012005

    • Peer Reviewed
  • [Journal Article] Recent progress on identifications of spectral lines from tungsten ions in low and high ionization stages using laboratory plasmas for fusion research and its application to plasma diagnostics2022

    • Author(s)
      S.Morita, C.F.Dong, D.Kato, T.Oishi, L.Zhang, K.Fujii, M.Goto, M.Hasuo, Y.Kawamoto, I.Murakami, N.Nakamura and H.A.Sakaue
    • Journal Title

      Springer Proceedings in Physics

      Volume: 271 Pages: 23-36

    • DOI

      10.1007/978-981-16-7691-8_2

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spatial Profiles of NeVI-NeX Emission in ECR-Heated Discharges of the Large Helical Device with Divertor Detachment Induced by RMP Application and Ne Impurity Seeding2022

    • Author(s)
      T.Oishi, M.Kobayashi, H.Takahashi, Y.Hayashi, K.Mukai, S.Morita, M.Goto, Y.Kawamoto, T.Kawate, S.Masuzaki, C.Suzuki, G.Kawamura, G.Motojima and R.Seki
    • Journal Title

      Plasma and Fusion Research

      Volume: 17 Pages: 2402022-1-7

    • DOI

      10.1585/pfr.17.2402022

    • Peer Reviewed
  • [Journal Article] Confirmation of the Absence of Contact Between Edge Boundary Plasma and Inboard First Wall in LHD Discharges Based on Radial Profile Measurement of Hβ Line Emissions2022

    • Author(s)
      Y.Kawamoto, S.Morita, G.Kawamura, M.Goto, T.Oishi, T.kawate, M.Kobayashi and M.Shoji
    • Journal Title

      Fusion Science and Technology

      Volume: 78 Pages: 537-548

    • DOI

      10.1080/15361055.2022.2068897

    • Peer Reviewed
  • [Journal Article] Confinement improvement during detached phase with RMP application in deuterium plasmas of LHD2022

    • Author(s)
      M.Kobayashi, R.Seki, Y.hayashi, T.Oishi, K.Tanaka, Y.Takemura, K.Ida, T.Kinoshita, K.Mukai, S.Morita and S.Masuzaki
    • Journal Title

      Nuclear Fusion

      Volume: 62 Pages: 056006-1-16

    • DOI

      10.1088/1741-4326/ac42f3

    • Peer Reviewed
  • [Journal Article] Simultaneous Observation of Tungsten Spectra ofW0 toW46+ Ions in Visible, VUV and EUV Wavelength Ranges in the Large Helical Device2021

    • Author(s)
      T.Oishi, S.Morita, D.Kato, I.Murakami, H.A.Sakaue, Y.Kawamoto and M.Goto
    • Journal Title

      Atoms

      Volume: 9 Pages: 69-1-14

    • DOI

      10.3390/atoms9030069

    • Peer Reviewed
  • [Journal Article] Identification of forbidden emission lines from highly ionized tungsten ions in VUV wavelength range in LHD for ITER edge plasma diagnostics2021

    • Author(s)
      T.Oishi, S.Morita, M.Kobayashi, K.Mukai, G.Kawamura, S.Masuzaki, Y.Hayashi, C.Suzuki, Y.Kawamoto and M.Goto
    • Journal Title

      Nuclear Materials and Energy

      Volume: 26 Pages: 100932-1-5

    • DOI

      10.1016/j.nme.2021.100932

    • Peer Reviewed
  • [Journal Article] EUV and VUV Spectra of NeIII-NeX Line Emissions Observed in the Impurity Gas-Puffing Experiments of the Large Helical Device2021

    • Author(s)
      T.Oishi, S.Morita, M.Kobayashi, K.Mukai, G.Kawamura, S.Masuzaki, Y.Hayashi, C.Suzuki, Y.Kawamoto and M.Goto
    • Journal Title

      Plasma and Fusion Research

      Volume: 16 Pages: 2402006-1-6

    • DOI

      10.1585/pfr.16.2402006

    • Peer Reviewed
  • [Journal Article] Observation of line emissions from Ni-like W46+ ions in wavelength range of 7 - 8A in the Large Helical Device2021

    • Author(s)
      T.Oishi, S.Morita, D.Kato, I.Murakami, H.A.Sakaue, Y.Kawamoto and M.Goto
    • Journal Title

      Physica Scripta

      Volume: 96 Pages: 025602-1-11

    • DOI

      10.1088/1402-4896/abd0ba

    • Peer Reviewed
  • [Journal Article] Line identification of boron and nitrogen emissions in extreme- and vacuum-ultraviolet wavelength ranges in the impurity powder dropping experiments of the Large Helical Device and its application to spectroscopic diagnostics2021

    • Author(s)
      T.Oishi, N.Ashikawa, F.Nespoli, S.Masuzaki, M.Shoji, E.P.Gilson, R.Lunsford, S.Morita, M.Goto, Y.Kawamoto, C.Suzuki, Z.Sun, A.Nagy, D.A.Gates and T.Morisaki
    • Journal Title

      Plasma Science and Technology

      Volume: 23 Pages: 084002-1-12

    • DOI

      10.1088/2058-6272/abfd88

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Qualitative Improvement of Zeff Diagnostic Based on Visible Bremsstrahlung Profile Measurement by Changing Observation Cross Section in LHD2021

    • Author(s)
      Y.Kawamoto, S.Morita, M.Goto and T.Oishi
    • Journal Title

      Plasma and Fusion Research

      Volume: 16 Pages: 2402072-1-5

    • DOI

      10.1585/pfr.16.2402072

    • Peer Reviewed
  • [Journal Article] Progress of tungsten spectral modeling for ITER edge plasma diagnostics based on tungsten spectroscopy in LHD2021

    • Author(s)
      I.Murakami, D.Kato, T.Oishi, M.Goto, Y.Kawamoto, C.Suzuki, H.A.Sakaue and S.Morita
    • Journal Title

      Nuclear Materials and Energy

      Volume: 26 Pages: 100923-1-10

    • DOI

      10.1016/j.nme.2021.100923

    • Peer Reviewed
  • [Journal Article] Assessment of W density in LHD core plasmas using visible forbidden lines of highly charged W ions2021

    • Author(s)
      D.Kato, H.A.Sakaue, I.Murakami, M.Goto, T.Oishi, N.Tamura, H.Funaba and S.Morita
    • Journal Title

      Nuclear Fusion

      Volume: 61 Pages: 116008-1-11

    • DOI

      10.1088/1741-4326/ac22d1

    • Peer Reviewed
  • [Presentation] LHDのX線結晶分光によって観測された波長領域3.7-4.0Aにおける高電離タングステンイオンの発光線スペクトル2023

    • Author(s)
      大石鉄太郎,森田繁,村上泉,後藤基志,加藤太治,坂上裕之,川本靖子,川手朋子
    • Organizer
      日本物理学会春季大会
  • [Presentation] Observation of magnetic dipole (M1) forbidden lines in fusion plasmas and its contribution to atomic physics and burning plasma diagnostics2022

    • Author(s)
      S.Morita, T.Oishi, D.Kato, M.Goto, I.Murakami and L.Zhang
    • Organizer
      AAPPS-DPP2022 (6th APCPP)
    • Int'l Joint Research / Invited
  • [Presentation] Electron Temperature Dependence of EUV and VUV Spectral Shapes of Tungsten Unresolved Transition Arrays Observed in the Large Helical Device2022

    • Author(s)
      T.Oishi, S.Morita, I.Murakami, D.Kato, H.A.sakaue, Y.kawamoto, T.Kawate and M.Goto
    • Organizer
      International Conference on Spectral Line Shapes
    • Int'l Joint Research
  • [Presentation] 空間分解分光を用いたLHDにおけるタングステン不純物蓄積挙動の観測2022

    • 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,川手朋子,後藤基志
    • Organizer
      日本物理学会秋季大会

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Published: 2023-12-25  

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