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Proposal of a low-loss transmission method for an ECRH system using optical vortexes

Research Project

Project/Area Number 20K14444
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionNihon University (2023-2024)
Ritsumeikan University (2020-2022)

Principal Investigator

FUJITA Yoshihisa  日本大学, 生産工学部, 助教 (20780711)

Project Period (FY) 2020-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords光渦 / ECRH / 円筒導波管 / コルゲート導波管
Outline of Research at the Start

電子サイクロトロン共鳴加熱(ECRH)はプラズマ加熱の代表的な方法の一つである.ラゲールガウスビームは3次元的な位相構造からくる自由度により,効果的に共振させることができるため,さらなる加熱効率の向上が期待できる.しかしながら,既存伝送路ではラゲールガウスビームの伝播を想定していないため,伝播可能性を調査する必要がある.既存加熱装置を改変することはリスクを伴うため,理論計算をもとにした数値シミュレーションを用いる.現在の ECRH 装置ではコルゲート導波管が用いられており,その固有モードはハイブリッドモードである.そこで,ラゲールガウスビームのハイブリッド化も行う.

Outline of Final Research Achievements

This study investigates efficient transmission and excitation methods for special electromagnetic waves called optical vortices, with the aim of applying them to future plasma heating technologies. To transmit high-frequency electromagnetic waves over long distances, waveguides are effective, and in particular, the “vortex beam,” a higher-order mode, exhibits properties similar to those of optical vortices. In this study, we calculated the coupling efficiency between electromagnetic waves in free space and waveguide modes and clarified their characteristics depending on the incident angle. Based on these results, we proposed a new method for exciting optical vortices using waveguides and demonstrated its effectiveness through simulations.

Academic Significance and Societal Importance of the Research Achievements

光渦の一部は,従来の電磁波では到達できない高密度プラズマ内へも伝搬できる可能性があり,次世代のプラズマ加熱技術として注目されている.本研究では,既存の導波管を用いて高出力の光渦を効率的に生成する新たな方法を提案した.また,シミュレーションや実験データの解析に役立つモード展開手法を開発し,電磁波の伝搬特性を詳細に評価可能とした.これらの成果は,核融合発電の実現に向けた基盤技術の一つとなるとともに,他の電磁波応用分野にも幅広く貢献し得ると考える.

Report

(6 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (30 results)

All 2025 2024 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (27 results) (of which Int'l Joint Research: 19 results)

  • [Journal Article] Generating optical vortex beams using cylindrical waveguides2024

    • Author(s)
      Fujita Yoshihisa、Nakamura Hiroaki、Kawaguchi Hideki、Goto Yuki、Kubo Shin
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 63 Issue: 10 Pages: 10SP07-10SP07

    • DOI

      10.35848/1347-4065/ad8167

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electromagnetic Penetration and Reflection Analysis in Fractal Structures using Three-dimensional Empirical Mode Decomposition2022

    • Author(s)
      Dong Ran, Fujita Yoshihisa, Nakamura Hiroaki, Ikuno Soichiro
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: in press Issue: 9 Pages: 1-4

    • DOI

      10.1109/tmag.2022.3161997

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Photonic Crystal Frequency Demultiplexer Design for Electromagnetic Wave using FDTD and MEMD2022

    • Author(s)
      Dong Ran, Shigeta Daisuke, Fujita Yoshihisa, Ikuno Soichiro
    • Journal Title

      Journal of Advanced Simulation in Science and Engineering

      Volume: 9 Issue: 1 Pages: 65-77

    • DOI

      10.15748/jasse.9.65

    • NAID

      130008158426

    • ISSN
      2188-5303
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] モード展開を用いたマイターベンドにおける高次モードの推定2025

    • Author(s)
      藤田宜久, 後藤勇樹, 久保伸
    • Organizer
      日本応用数理学会第21回研究部会連合発表会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Numerical Analysis of Miter Bend with Spiral Phase Mirror2024

    • Author(s)
      Y. Fujita, Y. Goto, H. Nakamura and S. Kubo
    • Organizer
      The 43rd JSST Annual Conference International Conference on Simulation Technology
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Generation of optical vortex beams using waveguides2024

    • Author(s)
      Y. Fujita, H. Nakamura, H. Kawaguchi, Y. Goto and S. Kubo
    • Organizer
      ISPlasma2024
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] 導波管を用いた光渦励起2023

    • Author(s)
      藤田宜久, 中村浩章, 川口秀樹, 後藤勇樹, 久保伸
    • Organizer
      第4回光渦研究会
    • Related Report
      2023 Research-status Report
  • [Presentation] An Attempt of Spurious Suppression in Meshless Method2023

    • Author(s)
      Y. Fujita, T. Itoh, S. Ikuno and R. Dong
    • Organizer
      ISEM2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Angular Momentum Coupling of Tilted Gaussian Beam with Waveguide Mode2023

    • Author(s)
      Y. Fujita, H. Nakamura, H. Kawaguchi and Y. Goto
    • Organizer
      GPF-Aomori
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Tilted Gaussian beam coupling with vortex beam mode in cylindrical waveguide2023

    • Author(s)
      Y. Fujita, H. Nakamura and H. Kawaguchi
    • Organizer
      JSST2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Investigation of Angular Momentum Coupling of Misaligned Gaussian Beam with Waveguide Mode2023

    • Author(s)
      Y. Fujita, H. Nakamura, H. Kawaguchi, S. Kubo and S. Ikuno
    • Organizer
      Compumag2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Angular Momentum Coupling of Gaussian Beam and Misaligned Waveguide Mode2023

    • Author(s)
      Y. Fujita, H. Nakamura, H. Kawaguchi, S. Kubo, Y. Goto and S. Ikuno
    • Organizer
      ISPlasma2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 斜め入射における円筒導波管のモード解析2022

    • Author(s)
      藤田宜久, 中村浩章, 川口秀樹, 久保伸, 生野壮一郎
    • Organizer
      日本応用数理学会 2022年度 年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Incidence angle dependence of excitation modes in corrugated waveguides2022

    • Author(s)
      Y. Fujita, H. Nakamura, H. Kawaguchi, S. Kubo, Y. Goto and S. Ikuno
    • Organizer
      JSST2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Optical Vortex Analysis Using Empirical Mode Decomposition2022

    • Author(s)
      R. Dong, Y. Fujita, H. Nakamura, H. Kawaguchi and S. Ikuno
    • Organizer
      JSST2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Optical Vortex Propagation Simulation in Corrugated Waveguide2022

    • Author(s)
      Y. Fujita, H. Nakamura, H. Kawaguchi, S. Kubo and Y. Goto
    • Organizer
      ISPlasma2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Optical Analysis of Fractal Nanostructured Materials using FDTD2022

    • Author(s)
      Y. Fujita, H. Nakamura, S. Ikuno and S. Nakata
    • Organizer
      Compumag2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Parallelization Efficiency of k-skip Mister R for Large Scale Linear System obtained from Electromagnetic Analysis2022

    • Author(s)
      T. Morishita, R. Dong, K. Abe, Y. Fujita and S. Ikuno
    • Organizer
      Compumag2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Optical Modeling of Nanostructures using Fractal Dimension2021

    • Author(s)
      Y. Fujita, H. Nakamura, S. Ikuno and S. Nakata
    • Organizer
      JSST2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] フラクタル次元を用いた光学特性のモデル化の検討2021

    • Author(s)
      藤田宜久, 中村浩章, 生野壮一郎, 仲田晋
    • Organizer
      2020年度非線形問題の解法と可視化に関する研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] 数値シミュレーションのための陰関数曲面モデリング2021

    • Author(s)
      仲田晋, 藤田宜久, 熊谷太生, 早川雄貴, 工藤雅也
    • Organizer
      2020年度非線形問題の解法と可視化に関する研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Numerical Analysis of Optical Properties in Metals with Fractal Structures2021

    • Author(s)
      Y. Fujita, H. Nakamura, S. Ikuno and S. Nakata
    • Organizer
      Proceedings of ISPlasma 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] ランダムフラクタルを用いた光学特性のモデル化の検討2021

    • Author(s)
      藤田宜久, 中村浩章, 生野壮一郎, 仲田晋
    • Organizer
      2020年度一般共同研究「ギガヘルツ・テラヘルツ帯における要素開発とその応用」研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Moving Least Squares Approximation with Chebyshev Nodes for Meshless Approaches2020

    • Author(s)
      Y. Fujita, T. Itoh, S. Ikuno and S. Nakata
    • Organizer
      ICCES2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] FDTD 法を用いたランダムフラクタルの光学応答解析2020

    • Author(s)
      藤田宜久, 中村浩章, 生野壮一郎, 仲田晋
    • Organizer
      MAGDA2020
    • Related Report
      2020 Research-status Report
  • [Presentation] Condition Number Reduction for An Eigenvalue Problem using Meshless Approach2020

    • Author(s)
      Y. Fujita, S. Ikuno, T. Itoh and S. Nakata
    • Organizer
      Proceedings of CEFC 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Evaluations of Adaptive k-skip Mister R for Linear System obtained from Electromagnetic Analysis2020

    • Author(s)
      T. Morishita, A. Matsumoto, Y. Fujita, T. Itoh, K. Abe and S. Ikuno
    • Organizer
      Proceedings of CEFC 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Virtual Nodes for Generating Natural Shape Functions for Electromagnetic Wave Propagation Simulation by Meshless Time-Domain Method2020

    • Author(s)
      T. Itoh, Y. Hanaoka, Y. Fujita, S. Ikuno and H. Nakamura
    • Organizer
      Proceedings of CEFC 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Geometrical Modeling of Fuzzy Structure using Fractal Structures2020

    • Author(s)
      Y. Fujita and H. Nakamura
    • Organizer
      ITC29
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] FDTD 法を用いたファズ構造の光学応答解析2020

    • Author(s)
      藤田宜久,中村浩章
    • Organizer
      核融合シミュレーション:夏の合同研究会  ~材料から周辺プラズマまで~
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2026-01-16  

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