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Investigation of the 300 GHz millimeter-wave discharge for the millimeter-wave beamed energy propulsion

Research Project

Project/Area Number 17K17764
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Aerospace engineering
Plasma science
Research InstitutionUniversity of Fukui

Principal Investigator

Fukunari Masafumi  福井大学, 遠赤外領域開発研究センター, 助教 (80786070)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsミリ波放電 / 自己組織化 / ジャイロトロン / プラズマ計測 / マイクロ波ロケット / シャドウグラフ / 衝撃波 / ミリ波 / ガス放電 / 大気放電 / ハイスピードカメラ
Outline of Final Research Achievements

The beamed energy propulsions are attractive for the future low-cost mass-transportation to the space as alternatives to the chemical propulsions. A mega-watt class oscillator, gyrotron is currently available in the millimeter-wave range. The millimeter-wave discharge is a key factor of the thrust generation process. The ionization front propagates in the electric field lower than the ionization threshold and self-organized filamentary structures are created in the discharge. In this study, we investigated the millimeter wave discharge with high spatial and time resolution using a 303 GHz high-power gyrotron as a beam source. We observed the transition between two types of filamentary plasma arrays from the quarter-of-the-wavelength (λ/4) structure at the focal point to the comb-shaped array parallel to the incident beam with spacing of 0.96 λ for the first time. In addition, the shock wave formation and propagation was visualized by the shadowgraph.

Academic Significance and Societal Importance of the Research Achievements

ミリ波放電で現れる自己組織化された構造は気体の電離閾値に比べミリ波の局所電界強度が高い超臨界条件(着火部)と、低い亜臨界条件で異なる。亜臨界条件でのミリ波放電は既存の電離モデルでは説明できず、また衝撃波通過後のガスを電離波面が進展するので複雑である。本研究ではミリ波放電が着火部の超臨界条件から亜臨界条件に遷移していく過程を観測した。この観測結果を通して、プラズマ表面での回折波が櫛状の放電構造を形成することを示した。さらにシャドウグラフにより同条件におけるプラズマ周辺での衝撃波形成過程を捉えた。これらのデータはミリ波ビーミング推進にとって重要なミリ波放電の電離モデル開発に寄与する。

Report

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

    (11 results)

All 2020 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (10 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Observation of a comb-shaped filamentary plasma array under subcritical condition in 303-GHz millimetre-wave air discharge2019

    • Author(s)
      Fukunari Masafumi、Tanaka Shunsuke、Shinbayashi Ryuji、Yamaguchi Yuusuke、Tatematsu Yoshinori、Saito Teruo
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 17972-17972

    • DOI

      10.1038/s41598-019-54333-5

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 303 GHzミリ波放電構造と衝撃波の形成過程の観測2020

    • Author(s)
      福成雅史、山口裕資、立松芳典、斉藤輝雄
    • Organizer
      第8回「高エネルギー電磁ビームに誘起される放電とその工学的応用」ワークショップ
    • Related Report
      2019 Annual Research Report
  • [Presentation] シャドウグラフによる303 GHz ミリ波放電における衝撃波形成の計測2019

    • Author(s)
      福成雅史,田中俊輔,新林竜志,山口裕資,立松芳典,斉藤輝雄
    • Organizer
      第36回 プラズマ・核融合学会 年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Investigation of the Millimeter-Wave Discharge under the Subcritical Condition for a MHD Wireless Power Transfer System2019

    • Author(s)
      Masafumi Fukunari, Ryota Kamiya, Kazuki Nakagawa, Yuusuke Yamaguchi, Yoshinori Tatematsu, Teruo Saito,
    • Organizer
      The 32nd International Symposium on Space Technology and Science (ISTS)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Structure Formation of the Millimeter-Wave Air Breakdown Plasma at 303 GHz2019

    • Author(s)
      Masafumi Fukunari
    • Organizer
      The 12th International Workshop on Plasma Application and Hybrid Functionally Materials/The 6th Workshop on Discharge Induced in High-Energy Electromagnetic Beam
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高速度カメラを用いた E 面と H 面での303 GHz ミリ波放電構造の詳細計測2018

    • Author(s)
      福成雅史,田中俊輔,新林竜志,山口裕資,立松芳典,斉藤輝雄
    • Organizer
      第35回 プラズマ・核融合学会 年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Experimental investigation on millimeter-wave discharge induced in gas2018

    • Author(s)
      Masafumi Fukunari, Tetsuo Yokoyama, Shunsuke Tanaka, Ryuji Shinbayashi, Yuusuke Yamaguchi, Yoshinori Tatematsu, Teruo Saito, Kimiya Komurasaki
    • Organizer
      2nd Asia-Pacific Conference on Plasma Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 303 GHz大電力ミリ波放電の電界面と磁界面での構造の違い及び超臨界条件から亜臨界条件への変化2018

    • Author(s)
      福成雅史、横山哲士、田中俊輔、新林竜志、廣部匠、山口裕資、立松芳典、斉藤輝雄
    • Organizer
      第62回宇宙科学技術連合講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Observation of the Discharge Structure in 303 GHz Millimeter-Wave Air Breakdown2018

    • Author(s)
      Masafumi Fukunari, Tetsuo Yokoyama, Shunsuke Tanaka, Ryuji Shinbayashi, Takumi Hirobe, Yuusuke Yamaguchi, Yoshinori Tatematsu, Teruo Saito
    • Organizer
      IRMMW-THz 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] マイクロ波ロケットにおける亜臨界ミリ波放電構造の露光画像計測2018

    • Author(s)
      福成雅史、横山哲士、廣部匠、 新林竜志、 田中俊輔、 山口裕資、斉藤輝雄、立松芳典
    • Organizer
      H29年度 宇宙輸送シンポジウム
    • Related Report
      2017 Research-status Report
  • [Presentation] 303 GHz ミリ波大気放電の電界面と磁界面における構造と電離波面進展速度の電力密度依存性2017

    • Author(s)
      横山哲士, 福成雅史, 廣部匠, 新林竜志, 田中俊輔, 山口裕資, 立松芳典,斉藤輝雄
    • Organizer
      2017年度日本物理学会北陸支部定例学術講演会
    • Related Report
      2017 Research-status Report

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

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