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Measurement of multiple degrees of freedom flow of ions by optical vortex laser induced fluorescence method

Research Project

Project/Area Number 18K03579
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 14010:Fundamental plasma-related
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Yoshimura Shinji  核融合科学研究所, ヘリカル研究部, 准教授 (50311204)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords光渦 / レーザー誘起蛍光法 / プラズマ / 流れ / レーザー計測 / ドップラー分光 / 流れ計測
Outline of Final Research Achievements

An optical vortex is a light with a helically twisted equiphase surface. This study developed the optical vortex laser-induced fluorescence (OV-LIF) method, which utilized the unique phase space structure of optical vortex lasers and applied it to the flow measurement in plasmas. By using the azimuthal Doppler effect felt by atoms in the optical vortex, we have attempted to detect the flow across the laser beam, which is in principle impossible to measure with a plane-wave laser. Firstly, we identified the parameters where the azimuthal Doppler shift significantly affects the spectrum by numerical calculations. In addition, we observed that the spectral broadening (in its standard deviation) increased when the ion flow velocity across the laser was increased by applying a negative voltage to the electrode.

Academic Significance and Societal Importance of the Research Achievements

レーザーを用いたドップラー分光計測は、その性質上、1次元計測であった。本研究では、位相が螺旋状の空間構造をもつねじれた光である光渦レーザーを用いることで、これまで原理的に不可能であったレーザーを横切る方向も含めた2次元の計測が可能であることを示した。光の内部構造を操作することで、レーザー計測の自由度を拡張できることを示した点に、本研究の学術的意義がある。産業界で用いられているプロセスプラズマへの適用が可能となれば、社会に対しても貢献できる。

Report

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

    (10 results)

All 2020 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Modification of laser-induced fluorescence spectrum by additional azimuthal Doppler effect in optical vortex beams2020

    • Author(s)
      Yoshimura Shinji、Terasaka Kenichiro、Aramaki Mitsutoshi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: SH Pages: SHHB04-SHHB04

    • DOI

      10.35848/1347-4065/ab72cb

    • NAID

      120007176988

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Measuring ion flow velocity toward negatively biased electrode using optical vortex beams2020

    • Author(s)
      S. Yoshimura, K. Terasaka, M. Aramaki
    • Organizer
      73rd Annual Gaseous Electronics Conference
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 光渦レーザーを用いたプラズマ流計測の現状と展望2020

    • Author(s)
      吉村信次,寺坂健一郎,荒巻光利
    • Organizer
      第37回 プラズマ・核融合学会 年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Laser-induced fluorescence Doppler spectroscopy using higher-order Laguerre-Gaussian modes2019

    • Author(s)
      Shinji Yoshimura, Kenichiro Terasaka, Mitsutoshi Aramaki
    • Organizer
      19th Laser Aided Plasma Diagnostics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Modification of laser-induced fluorescence spectrum by additional azimuthal Doppler effect in optical vortex beams2019

    • Author(s)
      Shinji Yoshimura, Kenichiro Terasaka, Mitsutoshi Aramaki
    • Organizer
      XXXIV International Conference on Phenomena in Ionized Gases
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高次Laguerre-Gaussianモードを用いたレーザー誘起蛍光法の検討2019

    • Author(s)
      吉村信次、寺坂健一郎、荒巻光利
    • Organizer
      プラズマ・核融合学会第36回年会
    • Related Report
      2019 Research-status Report
  • [Presentation] 光渦ビームを用いたレーザー誘起蛍光計測の検討2018

    • Author(s)
      吉村信次、寺坂健一郎、荒巻光利
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Laser-induced fluorescence measurements using optical vortex beams2018

    • Author(s)
      Shinji Yoshimura, Kenichiro Terasaka, Mitsutoshi Aramaki
    • Organizer
      60th Annual Meeting of the APS Division of Plasma Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 光渦レーザー誘起蛍光法によるイオン流速計測2018

    • Author(s)
      吉村信次、寺坂健一郎、荒巻光利
    • Organizer
      第35回 プラズマ・核融合学会 年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 光渦レーザー誘起蛍光スペクトルに対する方位角方向ドップラーシフトの寄与2018

    • Author(s)
      吉村信次、寺坂健一郎、荒巻光利
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report

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

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