Atomic beam technology applicable to VLEO application and erosion analysis on materals aboard SLATS

• Project/Area Number: 18H01624
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: Kobe University
• Principal Investigator: Yokota Kumiko 神戸大学, 工学研究科, 助手 (20252794)
• Co-Investigator(Kenkyū-buntansha): 田川 雅人 神戸大学, 工学研究科, 准教授 (10216806)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥14,170,000 (Direct Cost: ¥10,900,000、Indirect Cost: ¥3,270,000); Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2020: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2018: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
• Keywords: 超低地球軌道 / 原子状酸素 / 窒素分子 / 材料劣化 / SLATS / VLEO / 地球高層大気 / 地上試験 / 超低軌道宇宙環境 / SLATS（つばめ） / 分子散乱 / 大気抵抗 / つばめ

Outline of Final Research Achievements

The development of the verylow earth orbit (VLEO) region, which is attracting worldwide attention, requires the development of ground test technologies that can reproduce the mixture ratio of nitrogen molecules and atomic oxygen, in addition to the number density of atmosphere. In this study, we developed a VLEO exposure test method and compared the results with those obtained by the world's first VLEO exposure test using the "Tsubame" (SLATS). As a result of this study, we realized a one-nozzle two-beam technology, we developed, could reproduce the results of the VLEO material test aboard SLATS.

Academic Significance and Societal Importance of the Research Achievements

Starlinkなど世界的に注目されている超低地球軌道（VLEO）領域では濃密な原子状酸素密度と窒素分子の同時衝突による急速な材料劣化が生じることが世界初の超低軌道衛星「つばめ（SLATS）」で示されている。本研究ではこの極限環境を再現できる地上試験技術（ワンノズル・ツービーム法）の開発と、SLATSで得られた軌道上データと比較することによる材料劣化メカニズムの解析に成功し、VLEO用材料試験技術を確立することに成功した。

Research Products

• [Journal Article] Laser-detonation hyperthermal beam source applicable to VLEO environmental simulations (2022)
  • Author(s): Masahito Tagawa, Ryota Okura, Wataru Ide, Sasuga Horimoto, Keisuke Ezaki, Atsushi Fujita, Kosuke Shoda, Kumiko Yokota,
  • Journal Title: CEAS Space Journal Volume: 14
  • Peer Reviewed
• [Journal Article] Anisotropic molecular scattering at microstructured surface for rarefied gas compression inside air breathing ion engine (2022)
  • Author(s): Kosuke Shoda, Naoki Kano, Yuki Jotaki, Keisuke Ezaki, Kazuki Itatani, Takashi Ozawa, Yusuke Yamashita, Kazutaka Nishiyama, Kumiko Yokota, Masahito Tagawa
  • Journal Title: CEAS Space Journal Volume: 14
  • Peer Reviewed
• [Journal Article] Effect of simultaneous N2 collisions on atomic oxygen-induced polyimide erosion in sub-low Earth orbit: comparison of laboratory and SLATS data (2021)
  • Author(s): Kumiko Yokota, Masahito Tagawa, Yusuke Fujimoto, Wataru Ide, Yugo Kimoto, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Shunsuke Imamura
  • Journal Title: CEAS Space Journal Volume: 13 Pages: 389-397
  • NAID: 120007124107
  • Peer Reviewed / Open Access
• [Presentation] Passive compression device in molecular flow by surface scattering: A key device for spacecraft intake system (2022)
  • Author(s): Masahito Tagawa, Yusaku Ashida Koki Sugimoto, Kosuke Shoda, Keisuke Ezaki, Kumiko Yokota, Takashi Ozawa, Yusuke Yamashita, Kazutaka Nishiyama
  • Organizer: The 5th International Workshop on Scattering of Atoms and Molecules from Surfaces
  • Int'l Joint Research
• [Presentation] Atomic oxygen density variation measured by SLATS/AOFS: Comparison of flight data and atmospheric model predictions (2022)
  • Author(s): Masahito Tagawa, Kumiko Yokota, Atsushi Fujita, Wataru Ide, Yasunobu Miyoshi, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yugo Kimoto
  • Organizer: 15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
  • Int'l Joint Research
• [Presentation] Shielding effect of atomic oxygen by satellite structure observed on SLATS and its compensation for material exposure experiment (2022)
  • Author(s): Masahito Tagawa, Kumiko Yokota, Wataru Ide, Atsushi Fujita, Shohei Urakawa, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yugo Kimoto
  • Organizer: 15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
  • Int'l Joint Research
• [Presentation] N2-acceleration effect on atomic oxygen-induced polyimide erosion in sub-LEO observed by SLATS/AOFS (2022)
  • Author(s): Kumiko Yokota, Masahito Tagawa, Wataru Ide, Atsushi Fujita, Sasuga Horimoto, Santa Nishioka, Keisuke Ezaki, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yugo Kimoto
  • Organizer: 15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
  • Int'l Joint Research
• [Presentation] Impact of neutral atmosphere environment on SLATS (2022)
  • Author(s): Yugo Kimoto, Yuta Tsuchiya, Eiji Miyazaki, Aki Goto, Kazuki Yukumatsu, Shunsuke Imamura, Haruo Kawasaki, Masanori Sasaki, Kumiko Yokota, Masahito Tagawa, Wataru Ide, Atsushi Fujita, Shohei Urakawa, Sasuga Horimoto, Santa Nishioka
  • Organizer: 15th International Symposium on Materials in a Space Environment / 13th International Conference on Protection of Materials and Systems from Space Environment
  • Int'l Joint Research
• [Presentation] Perspective on Atomic Oxygen Reaction with Thermal Control Materials in Space (2022)
  • Author(s): Masahito Tagawa, Kumiko Yokota
  • Organizer: The 13th Asian Thermophysical Properties Conference
  • Int'l Joint Research / Invited
• [Presentation] A research on material degradation of spacecraft in sub-low Earth orbit environment -An estimate of the contribution of inert molecule’s energy to the acceleration effect of the erosion of polyimide - (2022)
  • Author(s): Sasuga Horimoto, Santa Nishioka, Wataru Ide, Kumiko Yokota, Masahito Tagawa
  • Organizer: The 13th Asian Thermophysical Properties Conference
• [Presentation] Accelerated AO-induced polyimide erosion in VLEO by simultaneous collisions of hyperthermal N2 molecules (2021)
  • Author(s): Sasuga Horimoto, Atsushi Fujita, Wataru Ide, Kumiko Yokota, Masahito Tagawa
  • Organizer: 1st International Symposium on VLEO Missions and Technologies, Manchester, UK, June 28-29, 2021
  • Int'l Joint Research
• [Presentation] Atmospheric density probe for VLEO applications (2021)
  • Author(s): Taishi Kato, Shoma Taira, Momoka Shimoi, Kumiko Yokota, Yoshinori Nakayama, Takashi Ozawa, Masahito Tagawa
  • Organizer: 1st International Symposium on VLEO Missions and Technologies, Manchester, UK, June 28-29, 2021
  • Int'l Joint Research
• [Presentation] Molecular scattering at microstructured surface for rarefied gas compression inside air breathing ion engine (2021)
  • Author(s): Kosuke Shoda, Naoki Kano, Yuki Jotaki, Keisuke Ezaki, Kazuki Itatani, Takashi Ozawa, Yusuke Yamashita, Kazutaka Nishiyama, Kumiko Yokota, Masahito Tagawa
  • Organizer: 1st International Symposium on VLEO Missions and Technologies, Manchester, UK, June 28-29, 2021
  • Int'l Joint Research
• [Presentation] AO density variations during geomagnetic anomaly observed by SLATS (2021)
  • Author(s): Atsushi Fujita, Kumiko Yokota, Masahito Tagawa, Wataru Ide, Sasuga Horimoto, Yugo Kimoto, Yuta Tsuchiya, Aki Goto, Kazuki Yukumatsu, Eiji Miyazaki, Yasunobu Miyoshi
  • Organizer: 2nd Applied Space Environments Conference, November 1-5, 2021, Online
  • Int'l Joint Research
• [Presentation] Effect of direct atomic oxygen exposures on carbon nanotube field emission cathode: comparison of flight data and in-situ ground-based experiment (2021)
  • Author(s): Kazuki Itatani, Keisuke Ezaki, Fukami Yuki, Kumiko Yokota, Masahito Tagawa, Yasushi Ohkawa, Satomi Kawamoto
  • Organizer: 2nd Applied Space Environments Conference, November 1-5, 2021, Online
  • Int'l Joint Research
• [Presentation] Kapton erosion yields in various flight environments (2019)
  • Author(s): Wataru Ide, Yusuke Fujimoto, Kim K. de Groh, Bruce A. Banks, Yuta Tsuchiya, Kazuki Yukumatsu, Aki Goto, Eiji Miyazaki Yugo Kimoto, Kumiko Yokota, Masahito Tagawa
  • Organizer: Joint Symposium of 32nd International Symposium on Space Technology and Science and 9th Nano-Satellites Symposium
  • Int'l Joint Research
• [Presentation] Direct simulation Monte Carlo evaluation of hyperthermal molecular flow in air breathing ion engine (2019)
  • Author(s): Naoki Kano, Ryo Shirakawa, Momoka Shimoi, Takashi Ozawa,
  • Organizer: Joint Symposium of 32nd International Symposium on Space Technology and Science and 9th Nano-Satellites Symposium
  • Int'l Joint Research
• [Presentation] Development of ionization gauge for in-orbit measurement of molecular density (2019)
  • Author(s): Momoka Shimoi, Ryota Okura, Ryo Shirakawa, Naoki kano, Shunsuke Imamura
  • Organizer: Joint Symposium of 32nd International Symposium on Space Technology and Science and 9th Nano-Satellites Symposium
  • Int'l Joint Research
• [Presentation] Particle simulations of ECR plasma generation in air breathing ion engine (2019)
  • Author(s): Ryo Shirakawa, Hideyuki Usui, Yohei Miyake, Masahito Tagawa, Kazutaka Nishiyama
  • Organizer: Joint Symposium of 32nd International Symposium on Space Technology and Science and 9th Nano-Satellites Symposium
  • Int'l Joint Research
• [Presentation] Study of rarefied aerodynamics for super low altitude satellites (2019)
  • Author(s): Takashi Ozawa, Shunsuke Imamura, Masahito Tagawa, Kazuhisa Fujita
  • Organizer: Joint Symposium of 32nd International Symposium on Space Technology and Science and 9th Nano-Satellites Symposium
  • Int'l Joint Research
• [Presentation] 国際宇宙ステーション材料曝露試験における原子状酸素フルーエンス過小評価の可能性 (2019)
  • Author(s): 横田久美子、白川遼、井出航、岩田稔、木本雄吾、田川雅人
  • Organizer: 第40回日本熱物性シンポジウム
• [Presentation] 衛星搭載用超低地球軌道分子数密度測定装置の開発 (2019)
  • Author(s): 下位百香、松岡弘洋、小澤宇志、西山和孝、今村俊介、横田久美子、田川雅人
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] 超低軌道宇宙環境場におけるDSMCシミュレーションと適応係数に関する課題 (2019)
  • Author(s): 加納直起、江塚風也、白川 遼、下位百香、小澤宇志、今村俊介、西山和孝、横田久美子、田川雅人
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] ハニカム構造のコリメータを用いた大気吸入イオンエンジンの圧縮性能評価 (2019)
  • Author(s): 江塚風也、加納直起、白川 遼、下位百香、小澤宇志、今村俊介、西山和孝、横田久美子、田川雅人
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] マイクロ波放電型イオンエンジンμ10の放電室汚染による性能劣化の評価 (2019)
  • Author(s): 白川 遼、山下 裕介、神田大樹、細田聡史、月崎 竜堂、田川雅人、西山和孝
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] 超低軌道環境下におけるポリイミド反応効率：地上試験結果と軌道上計測結果について (2019)
  • Author(s): 井出 航、藤田敦史、土屋祐太、後藤亜希、行松和輝、宮崎英治、木本雄吾、横田久美子、田川雅人
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] 超低軌道環境下におけるポリイミド反応効率：SLATS/AOFSデータ解析結果 (2019)
  • Author(s): 藤田敦史、井出 航、土屋祐太、後藤亜希、行松和輝、宮崎英治、木本雄吾、横田久美子、田川雅人
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] 原子状酸素照射の均一性改良と照射省力化に向けた検討 (2019)
  • Author(s): 深見侑希、岩田 稔、横田久美子、田川雅人
  • Organizer: 第56回日本航空宇宙学会 関西・中部支部合同秋期大会
• [Presentation] レーザーデトネーション超熱分子線の解離抑制 (2019)
  • Author(s): 横田久美子、大倉僚太、藤本友介、田川雅人
  • Organizer: 第66回応用物理学会春季学術講演会
• [Presentation] A consideration of degradation of polymeric materials in sub-low Earth orbits space environment (2018)
  • Author(s): Yusuke Fujimoto, Ryota Okura, Kazuki Kita, Minoru Iwata, Kumiko Yokota, Masahito Tagawa
  • Organizer: 15th Spacecraft Charging Technology Conference
  • Int'l Joint Research
• [Presentation] Development of a pulsed supersonic valve aimed for Martian atmospheric simulation (2018)
  • Author(s): Ryota Okura, Yusuke Fujimoto, Kazuki Kita, Minoru Iwata, Chee Sze Keat, Yugo Kimoto, Kumiko Yokota, Masahito Tagawa
  • Organizer: 15th Spacecraft Charging Technology Conference
  • Int'l Joint Research
• [Presentation] Plasma particle simulation of ECR plasma generation in Air Breathing Ion Engine (ABIE) (2018)
  • Author(s): Ryo Shirakawa, Hideyuki Usui, Yohei Miyake, Masahito Tagawa, Kazutaka Nishiyama
  • Organizer: 15th Spacecraft Charging Technology Conference
  • Int'l Joint Research
• [Presentation] One-nozzle two-beam laser-detonation system (2018)
  • Author(s): Kumiko Yokota, Kazuki Kita, Ryota Okura, Teppei Shimizu, Sze Keat Chee, Minoru Iwata, Masahito Tagawa
  • Organizer: 14th International Symposium on Materials in the Space Environment/12th International Conference on protection of Materials and Structures in a Space Environment
  • Int'l Joint Research
• [Presentation] Over-estimation of atomic oxygen fluences due to undecomposed oxygen molecules included in hyperthermal beams (2018)
  • Author(s): Masahito Tagawa, Kazuki Kita, Ryota Okura, Yusuke Fujimoto, Ryo Shirakawa, Teppei Shimizu, Minoru Iwata, Kumiko Yokota
  • Organizer: 14th International Symposium on Materials in the Space Environment/12th International Conference on protection of Materials and Structures in a Space Environment
  • Int'l Joint Research
• [Presentation] Enhancement of atomic oxygen resistance of charge dissipative ion beam treated polymers (2018)
  • Author(s): Z. Iskanderova, J. Kleiman, F. Bussieres, M. Tagawa, R. Ng, R. Sodhi
  • Organizer: 14th International Symposium on Materials in the Space Environment/12th International Conference on protection of Materials and Structures in a Space Environment
  • Int'l Joint Research
• [Presentation] Cultivation of research and project-support network for degradation of space-use materials -Concept of cluster type in-situ test facilities system (2018)
  • Author(s): Minoru Iwata, Masahito Tagawa, Sumitaka Tachikawa, Issei Kato, Takayuki Hirose
  • Organizer: 14th International Symposium on Materials in the Space Environment/12th International Conference on protection of Materials and Structures in a Space Environment
  • Int'l Joint Research
• [Presentation] Evaluation of vacuum transfer vessel performance to construct cluster type in-situ test facilities network (2018)
  • Author(s): Alexandre Simon, Minoru Iwata, Masahito Tagawa, Sumitaka Tachikawa
  • Organizer: 14th International Symposium on Materials in the Space Environment/12th International Conference on protection of Materials and Structures in a Space Environment
  • Int'l Joint Research
• [Presentation] 超低軌道環境における中性ガス衝突誘起材料劣化現象メカニズムの解析 (2018)
  • Author(s): 横田久美子、田川雅人
  • Organizer: 第4回超低高度衛星の利用に向けたワークショップ
• [Presentation] 原子状酸素ビーム照射試験における残留未解離酸素分子の影響 (2018)
  • Author(s): 横田久美子、北 一貴、藤本友介、大倉僚太、田川雅人
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] 宇宙用材料を指向した液晶ポリマーへの原子状酸素照射 (2018)
  • Author(s): 小柴康子, 横田久美子，西本卓馬, 堀家匠平, 福島達也, 田川雅人, 石田謙司
  • Organizer: 第79回応用物理学会秋季学術講演会
• [Presentation] 超低軌道宇宙環境における高分子材料の劣化特性とSLATSデータとの比較検討 (2018)
  • Author(s): 藤本友介、井出航、大倉僚太、岩田稔、土屋佑太、後藤亜季、行松和輝、木本雄吾、横田久美子、田川雅人
  • Organizer: 第62回宇宙科学技術連合講演会
• [Presentation] 大倉僚太、藤本友介、清水鉄平、岩田稔、木本雄吾、横田久美子、田川雅人 (2018)
  • Author(s): 惑星高層大気環境模擬のための複合分子線システムの構築とロングノズルの効果
  • Organizer: 第62回宇宙科学技術連合講演会
• [Presentation] ISS材料劣化実験における原子状酸素フルーエンス計測法に関する一考察 (2018)
  • Author(s): 田川雅人、藤本友介、大倉僚太、白川遼、井出航、横田久美子、Kim K. de Groh, Bruce A. Banks
  • Organizer: 第15回宇宙環境シンポジウム
• [Presentation] 超低軌道宇宙環境模擬のためのワンノズルツービームレーザーデトネーション原子状酸素ビーム装置 (2018)
  • Author(s): 横田久美子、大倉僚太、藤本友介、岩田稔、田川雅人
  • Organizer: 第39回日本熱物性シンポジウム
• [Presentation] 超熱原子ビームによる固体表面の濡れ性制御 (2018)
  • Author(s): 田川雅人、横田久美子
  • Organizer: 第39回日本熱物性シンポジウム
• [Presentation] 惑星高層大気シミュレーションのための複合分子線システムの構築とロングノズルの効果 (2018)
  • Author(s): 大倉僚太、藤本友介、清水鉄平、岩田稔、木本雄吾、横田久美子、田川雅人
  • Organizer: 2018年日本表面真空学会学術講演会
• [Presentation] 超低軌道宇宙環境での高分子材料の耐性評価とSLATSデータとの比較検討について (2018)
  • Author(s): 藤本友介、井出航、大倉僚太、岩田稔、土屋佑太、後藤亜希、行松和輝、木本雄吾、横田久美子、田川雅人
  • Organizer: 2018年日本表面真空学会学術講演会
• [Presentation] 超低軌道宇宙環境における高分子材料の劣化原因対する考察とSLATSデータとの比較検討 (2018)
  • Author(s): 藤本友介、井出航、大倉僚太、岩田稔、土屋佑太、後藤亜希、行松和輝、木本雄吾、横田久美子、田川雅人
  • Organizer: 第55日本航空宇宙学会中部・関西支部合同秋季大会
• [Presentation] 惑星高層大気環境模擬のための複合分子線システムの構築とロングノズルの効果について (2018)
  • Author(s): 大倉僚太、藤本友介、清水鉄平、岩田稔、木本雄吾、横田久美子、田川雅人
  • Organizer: 第55日本航空宇宙学会中部・関西支部合同秋季大会
• [Book] 最新実用真空技術総覧 (2019)
  • Author(s): 田川雅人、横田久美子 他、分担執筆
  • Total Pages: 1084
  • Publisher: エヌ・ティー・エス、東京
  • ISBN: 9784860435592
• [Remarks] 神戸大学大学院工学研究科における宇宙環境研究のページ
  • URL: http://www.space-environmental-effect.jp/index.html