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Challenge to Infinite Life Time Electric Propulsion using Single Crystals

Research Project

Project/Area Number 19K22020
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionJapan Aerospace EXploration Agency

Principal Investigator

Funaki Ikkoh  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 教授 (50311171)

Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords電気推進 / ホローカソード / スパッタリング / 単結晶 / 長寿命 / 単結晶素材 / 航空宇宙工学 / プラズマ・核融合 / 衛星推進 / ホールスラスタ
Outline of Research at the Start

イオンエンジン等の宇宙機用電気推進機には、一層の長時間動作とこれに基づく宇宙機軌道変換能力の向上が求められている。本研究では、電気推進機の寿命を律速している電子源を無損耗化するため、電子放出を担う部位への単結晶材料の適用可能性を追求する。研究の実施にあたり、単結晶材料において原子配向が同一である特性によって、低エネルギーキセノンイオンが材料に衝突する際の損耗を無くすことが可能であるという仮説を立て、仮説の実験的検証を図る。

Outline of Final Research Achievements

Electric space propulsion (EP) such as ion thrusters and Hall thrusters exhausts a plasma jet to propel a spacecraft. EP's feature is high specific impulse, which means larger amount of delta-V is possible with the same propellant mass in comparison with conventional chemical propulsion. In this study, methods to drastically lower the erosion rate of a hollow cathode were tried experimentally. Although the effect of crystal structure on sputtering yield by xenon ion impact was not significant, it was found that the ion energy onto the orifice could be reduced via selecting appropriate orifice diameter and neutral density. By the latter approach life time in the order of several tens of thousand hours is expected.

Academic Significance and Societal Importance of the Research Achievements

打ち上げから軌道制御までをすべてを燃費の良い電気推進機で実施する次世代衛星は、オール電化衛星と呼ばれ、その優れたペイロード搭載率から、2020年代人工衛星市場の主流になると予想されている。損耗の非常に小さいカソードオリフィス等素材設計が得られたことで、現在のスラスタ寿命制約を逃れ、自在な人工衛星運用や、軌道間輸送、惑星間輸送などの長期にわたるミッションの実現へと繋がり、挑戦的な意義を持つ。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2022 2021 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (14 results) (of which Int'l Joint Research: 6 results,  Invited: 3 results)

  • [Journal Article] The Effect of Discharge Mode on Ion Energy and Plasma Potential in the Plume Plasma Region2022

    • Author(s)
      Haoxiang Liu, Satoshi Satoh, Yasuhiro Shoji, Ichiro Jikuya, Katsuhiko Yamada
    • Journal Title

      TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES

      Volume: 65 Issue: 1 Pages: 1-10

    • DOI

      10.2322/tjsass.65.1

    • NAID

      130008139595

    • ISSN
      0549-3811, 2189-4205
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental Investigation of LaB6 Hollow Cathode with Radiative Heater2019

    • Author(s)
      OSHIO Yuya、KUBOTA Kenichi、WATANABE Hiroki、CHO Shinatora、OHKAWA Yasushi、FUNAKI Ikkoh
    • Journal Title

      TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN

      Volume: 17 Issue: 2 Pages: 203-210

    • DOI

      10.2322/tastj.17.203

    • NAID

      130007607452

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] The Fluctuation Characteristics in the Hollow Cathode with Magnetic Fields2022

    • Author(s)
      Daisuke Imaguchi, Yuya Oshio, Hiroki Watanabe, Shun Imai, Ikkoh Funaki, Yoshiki Yamagiwa
    • Organizer
      33rd International Symposium on Space Technology and Science
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 大電力ホールスラスタの研究開発-ETS-9実験から将来探査へ-2022

    • Author(s)
      船木一幸
    • Organizer
      宇宙輸送シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] LaB6ホローカソードの損耗量評価に向けたプラズマ計測および材料表面分析2022

    • Author(s)
      今井駿,渡邊裕樹,松永芳樹,船木一幸
    • Organizer
      宇宙輸送シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] Characterization of a Hollow Cathode Plasma with Magnetic Fields2021

    • Author(s)
      Daisuke Imaguchi, Hiroki Watanabe, Shun Imai, Ikkoh Funaki and Yoshiki Yamagiwa
    • Organizer
      AIAA Propulsion and Energy Forum
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 宇宙機用次世代ホールスラスタの研究開発2021

    • Author(s)
      船木一幸
    • Organizer
      プラズマ核融合学会年会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 軸方向磁場がホローカソードの放出プラズマに与える影響の評価2021

    • Author(s)
      今口大輔,渡邊裕樹,今井駿,船木一幸,山極芳樹
    • Organizer
      第65回宇宙科学技術連合講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] An Overview of Electric Propulsion Activities in Japan2021

    • Author(s)
      Ikkoh Funaki
    • Organizer
      10th Asian Joint Conference on Propulsion and Power
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Measurement and Observation on Spot-plume Mode Plasmas of LaB6 Hollow Cathode2021

    • Author(s)
      Shun Imai, Kenichi Kubota, Shinatora Cho, Ikkoh Funaki, Daisuke Imaguchi, Hiroki Watanabe, Yuya Oshio
    • Organizer
      10th Asian Joint Conference on Propulsion and Power
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] LaB6ホローカソードの耐久性能向上に向けたプラズマ特性評価2021

    • Author(s)
      今井駿,渡邊裕樹,松永芳樹,今口大輔,窪田健一,張科寅,大塩裕哉,船木一幸
    • Organizer
      2020年度宇宙輸送シンポジウム
    • Related Report
      2020 Research-status Report
  • [Presentation] 磁場中におけるホローカソードプルームプラズマのイオンエネルギー計測2021

    • Author(s)
      今口大輔,渡邊裕樹,今井駿,船木一幸,山極芳樹
    • Organizer
      2020年度宇宙輸送シンポジウム
    • Related Report
      2020 Research-status Report
  • [Presentation] Life Test of a 6-kW-class Hall Thrusters Breadboard Model2020

    • Author(s)
      Ikkoh Funaki, Shinatora Cho, Tadahiko Sano, Tsutomu Fukatsu, Hiroki Watanabe, Yoshiki Matsunaga, Daisuke Goto, Yosuke Tashiro, Yuya Hirano and Taizo Shiiki
    • Organizer
      AIAA Propulsion and Energy Forum
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 大電力電気推進システムの研究2020

    • Author(s)
      船木一幸
    • Organizer
      令和元年度航空宇宙空力シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] ホローカソードプラズマのイオンエネルギーおよび放電モードに関する研究2020

    • Author(s)
      今井 駿,今口 大輔,渡邊 裕樹,窪田 健一, 張 科寅,大塩 裕哉,船木 一幸
    • Organizer
      令和元年度宇宙輸送シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] Plasma Measurement in the Plume Region of a Lanthanum Hexaboride Hollow Cathode2019

    • Author(s)
      Yuya Oshio, Kensho Torii, Kenichi Kubota, Ikkoh Funaki, Yoshihiro Okuno
    • Organizer
      Joint Symposium: 32nd ISTS & 9th NSAT
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-07-04   Modified: 2023-01-30  

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