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國中 均

クニナカ ヒトシ  (Hitoshi Kuninaka)

基本情報

所属
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 理事・所長
学位
工学博士(1988年3月 東京大学)
工学修士(1985年3月 東京大学)
ORCID ID
 https://orcid.org/0000-0002-6871-3133
J-GLOBAL ID
200901080116851867
researchmap会員ID
1000144511
外部リンク

　２０１０年６月１３日、「はやぶさ」小惑星探査機が宇宙の遥か彼方から豪州ウーメラ砂漠に目掛けて地球大気に超高速で突入してきました。探査機は木っ端微塵に分解し蒸発してしまいましたが、カプセルだけが高温環境を耐え抜き落下傘を開き、着陸に成功しました。この事業を実現させるため、イオンエンジンの研究開発、探査機設計・製造・試験、打ち上げ、宇宙運用、豪州政府と交渉、世界の科学者の説得と、多岐に渡る課題を一つ一つ解決した上で、私が回収班長として組織した５０名に及ぶJAXA職員を３００ｋｍに渡る広域に散開させ、カプセル収容が成されました。
　カプセルの回収に成功し、安堵と疲労で意識が遠のく中、ふと過去の記憶が蘇りました。高校生の頃、武蔵高校の太陽観測部で２０名ほどの中学生を引率して、夏にはペルセウス座流星群の観測のため福島県の安達太良高原と熱塩温泉と二手に分かれて合宿したこと、年末にはこぐま座やしぶんぎ座流星群観測のため高尾山頂上と校舎屋上から２点観測したことが思い出されました。昔は２０名でクラブ活動の日本国内だったものが、５０名で国家事業としての海外遠征にまでなったのだとその時初めて気が付きました。
　はやぶさの成果に基づいて、私がプロジェクトマネージャとして完成させた「はやぶさ２」は、ほぼ完璧に宇宙ミッションをこなし、２０２０年１２月６日、再び豪州ウーメラ砂漠にカプセルを届けました。コロナ禍という宇宙科学技術とは異次元の困難を突破し、７０名に及ぶJAXA職員を再び豪州に送り込み、カプセル回収に成功しました。それだけでなく、２０２９年には火星の月フォボスからサンプル回収する３度目の事業：MMX計画を開発中であり、約１０年間隔で定期的に宇宙物質を持ち帰り地球で分析するmanifestoを推進しています。水星から土星に至る各天体に宇宙研のDNAを込めた探査機を配置した「深宇宙船団 (Deep Space Fleet)」がもうじきに完成します。これらtacticsを総動員して、太陽系４６億年の歴史を解き明かし、生命の起源に迫ります。

 

研究キーワード

 3

研究分野

 3

主要な経歴

 12
もっとみる

学歴

 6
もっとみる

主要な受賞

 39
もっとみる

論文

 163
  • Daisuke Nakata, Kyoichiro Toki, Ikkoh Funaki, Hitoshi Kuninaka
    Journal of Propulsion and Power 27(4) 912-915 2011年7月  査読有り
  • 大道渉, 國中均
    プラズマ応用科学 19(1) 36-41 2011年6月  査読有り責任著者
  • Seiji Kawamura, Masaki Ando, Naoki Seto, Shuichi Sato, Takashi Nakamura, Kimio Tsubono, Nobuyuki Kanda, Takahiro Tanaka, Jun'ichi Yokoyama, Ikkoh Funaki, Kenji Numata, Kunihito Ioka, Takeshi Takashima, Kazuhiro Agatsuma, Tomotada Akutsu, Koh-suke Aoyanagi, Koji Arai, Akito Araya, Hideki Asada, Yoichi Aso, Dan Chen, Takeshi Chiba, Toshikazu Ebisuzaki, Yumiko Ejiri, Motohiro Enoki, Yoshiharu Eriguchi, Masa-Katsu Fujimoto, Ryuichi Fujita, Mitsuhiro Fukushima, Toshifumi Futamase, Tomohiro Harada, Tatsuaki Hashimoto, Kazuhiro Hayama, Wataru Hikida, Yoshiaki Himemoto, Hisashi Hirabayashi, Takashi Hiramatsu, Feng-Lei Hong, Hideyuki Horisawa, Mizuhiko Hosokawa, Kiyotomo Ichiki, Takeshi Ikegami, Kaiki T Inoue, Koji Ishidoshiro, Hideki Ishihara, Takehiko Ishikawa, Hideharu Ishizaki, Hiroyuki Ito, Yousuke Itoh, Kiwamu Izumi, Isao Kawano, Nobuki Kawashima, Fumiko Kawazoe, Naoko Kishimoto, Kenta Kiuchi, Shiho Kobayashi, Kazunori Kohri, Hiroyuki Koizumi, Yasufumi Kojima, Keiko Kokeyama, Wataru Kokuyama, Kei Kotake, Yoshihide Kozai, Hiroo Kunimori, Hitoshi Kuninaka, Kazuaki Kuroda, Sachiko Kuroyanagi, Kei-ichi Maeda, Hideo Matsuhara, Nobuyuki Matsumoto, Yuta Michimura, Osamu Miyakawa, Umpei Miyamoto, Shinji Miyoki, Mutsuko Y Morimoto, Toshiyuki Morisawa, Shigenori Moriwaki, Shinji Mukohyama, Mitsuru Musha, Shigeo Nagano, Isao Naito, Kouji Nakamura, Hiroyuki Nakano, Kenichi Nakao, Shinichi Nakasuka, Yoshinori Nakayama, Kazuhiro Nakazawa, Erina Nishida, Kazutaka Nishiyama, Atsushi Nishizawa, Yoshito Niwa, Taiga Noumi, Yoshiyuki Obuchi, Masatake Ohashi, Naoko Ohishi, Masashi Ohkawa, Kenshi Okada, Norio Okada, Kenichi Oohara, Norichika Sago, Motoyuki Saijo, Ryo Saito, Masaaki Sakagami, Shin-ichiro Sakai, Shihori Sakata, Misao Sasaki, Takashi Sato, Masaru Shibata, Hisaaki Shinkai, Ayaka Shoda, Kentaro Somiya, Hajime Sotani, Naoshi Sugiyama, Yudai Suwa, Rieko Suzuki, Hideyuki Tagoshi, Fuminobu Takahashi, Kakeru Takahashi, Keitaro Takahashi, Ryutaro Takahashi, Ryuichi Takahashi, Tadayuki Takahashi, Hirotaka Takahashi, Takamori Akiteru, Tadashi Takano, Nobuyuki Tanaka, Keisuke Taniguchi, Atsushi Taruya, Hiroyuki Tashiro, Yasuo Torii, Morio Toyoshima, Shinji Tsujikawa, Yoshiki Tsunesada, Akitoshi Ueda, Ken-ichi Ueda, Masayoshi Utashima, Yaka Wakabayashi, Kent Yagi, Hiroshi Yamakawa, Kazuhiro Yamamoto, Toshitaka Yamazaki, Chul-Moon Yoo, Shijun Yoshida, Taizoh Yoshino, Ke-Xun Sun
    Classical and Quantum Gravity 28(9) 094011-094011 2011年5月7日  査読有り
  • Jun'ichiro Kawaguchi, Hitoshi Kuninaka, Makoto Yoshikawa
    Advances in the Astronautical Sciences 141 403-414 2011年  
  • Takahide Mizuno, Kousuke Kawahara, Kazuhiko Yamada, Yukio Kamata, Tetsuya Yamada, Hitoshi Kuninaka
    IEICE Transactions on Communications E94-B(11) 2961-2968 2011年  査読有り最終著者
  • 國中
    静電気学会誌 35(6) 237-240 2011年  査読有り
    「はやぶさ」小惑星探査機は真空で全日照の深宇宙空間を、イオンエンジンという新しい推進装置を駆り動力航行を行った１）。これまでの宇宙帯電放電に関する我々の知見は、地球周回衛星にて培われたものである。その理論を「はやぶさ」に応用し、一定の成果を収めた。本稿ではまず一般的な受動帯電を概説し、次に能動帯電、さらに「はやぶさ」の宇宙帯電放電に対する緩和的設計法に関して述べる。
  • 川口, 國中
    日本航空宇宙学会誌 59(694) 2011年  招待有り
  • Hiroyuki Koizumi, Hitoshi Kuninaka
    JOURNAL OF PROPULSION AND POWER 26(3) 601-604 2010年5月  査読有り
  • 細田, 國中
    プラズマ・核融合学会誌 86(5) 2010年5月  招待有り
  • Masaki Ando, Seiji Kawamura, Naoki Seto, Shuichi Sato, Takashi Nakamura, Kimio Tsubono, Takeshi Takashima, Ikkoh Funaki, Kenji Numata, Nobuyuki Kanda, Takahiro Tanaka, Kunihito Ioka, Kazuhiro Agatsuma, Koh-suke Aoyanagi, Koji Arai, Akito Araya, Hideki Asada, Yoichi Aso, Takeshi Chiba, Toshikazu Ebisuzaki, Yumiko Ejiri, Motohiro Enoki, Yoshiharu Eriguchi, Masa-Katsu Fujimoto, Ryuichi Fujita, Mitsuhiro Fukushima, Toshifumi Futamase, Tomohiro Harada, Tatsuaki Hashimoto, Kazuhiro Hayama, Wataru Hikida, Yoshiaki Himemoto, Hisashi Hirabayashi, Takashi Hiramatsu, Feng-Lei Hong, Hideyuki Horisawa, Mizuhiko Hosokawa, Kiyotomo Ichiki, Takeshi Ikegami, Kaiki T Inoue, Koji Ishidoshiro, Hideki Ishihara, Takehiko Ishikawa, Hideharu Ishizaki, Hiroyuki Ito, Yousuke Itoh, Kiwamu Izumi, Isao Kawano, Nobuki Kawashima, Fumiko Kawazoe, Naoko Kishimoto, Kenta Kiuchi, Shiho Kobayashi, Kazunori Kohri, Hiroyuki Koizumi, Yasufumi Kojima, Keiko Kokeyama, Wataru Kokuyama, Kei Kotake, Yoshihide Kozai, Hiroo Kunimori, Hitoshi Kuninaka, Kazuaki Kuroda, Kei-ichi Maeda, Hideo Matsuhara, Yasushi Mino, Osamu Miyakawa, Umpei Miyamoto, Shinji Miyoki, Mutsuko Y Morimoto, Toshiyuki Morisawa, Shigenori Moriwaki, Shinji Mukohyama, Mitsuru Musha, Shigeo Nagano, Isao Naito, Kouji Nakamura, Masahiro Nakamura, Hiroyuki Nakano, Kenichi Nakao, Shinichi Nakasuka, Yoshinori Nakayama, Kazuhiro Nakazawa, Erina Nishida, Kazutaka Nishiyama, Atsushi Nishizawa, Yoshito Niwa, Taiga Noumi, Yoshiyuki Obuchi, Masatake Ohashi, Naoko Ohishi, Masashi Ohkawa, Kenshi Okada, Norio Okada, Kenichi Oohara, Norichika Sago, Motoyuki Saijo, Ryo Saito, Masaaki Sakagami, Shin-ichiro Sakai, Shihori Sakata, Misao Sasaki, Takashi Sato, Masaru Shibata, Hisaaki Shinkai, Kentaro Somiya, Hajime Sotani, Naoshi Sugiyama, Yudai Suwa, Rieko Suzuki, Hideyuki Tagoshi, Fuminobu Takahashi, Kakeru Takahashi, Keitaro Takahashi, Ryutaro Takahashi, Ryuichi Takahashi, Tadayuki Takahashi, Hirotaka Takahashi, Takamori Akiteru, Tadashi Takano, Keisuke Taniguchi, Atsushi Taruya, Hiroyuki Tashiro, Yasuo Torii, Morio Toyoshima, Shinji Tsujikawa, Yoshiki Tsunesada, Akitoshi Ueda, Ken-ichi Ueda, Masayoshi Utashima, Yaka Wakabayashi, Kent Yagi, Hiroshi Yamakawa, Kazuhiro Yamamoto, Toshitaka Yamazaki, Jun'ichi Yokoyama, Chul-Moon Yoo, Shijun Yoshida, Taizoh Yoshino, Ke-Xun Sun
    Classical and Quantum Gravity 27(8) 084010-084010 2010年4月21日  査読有り
  • Yasuhiro Kawakatsu, Hitoshi Kuninaka, Kazutaka Nishiyama
    Advances in the Astronautical Sciences 136 1361-1372 2010年  
  • Yasuhiro Kawakatsu, Hitoshi Kuninaka, Kazutaka Nishiyama
    SPACEFLIGHT MECHANICS 2010, PTS I-III 136 1361-1372 2010年  査読有り
  • 月崎竜童, 小泉宏之, 西山和孝, 國中均
    プラズマ応用科学 18(2) 139-144 2010年  査読有り最終著者
  • Yasuhiro KAWAKATSU, Hitoshi KUNINAKA, Kazutaka NISHIYAMA
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 8(ists27) Pd_29-Pd_35 2010年  査読有り
  • IWAKAWA Akira, NAKATA Daisuke, KUNINAKA Hitoshi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 8(ists27) Pb_13-Pb_17 2010年  査読有り
    A two-dimensional applied-field magnetoplasmadynamic thruster (2D AF-MPDT) has been developed. A strong crossed magnetic field of more than 1 T can be applied to the 2D AF-MPDT. A thrust measurement system was newly developed. Successful operation with several applied magnetic field strengths from 0 T to 1 T was achieved and acceptable thrust efficiency was obtained. The discharge voltage increased when the magnetic field was applied. The thrust efficiency improves with increasing magnetic field. An operation limit such as a voltage hash was not observed. In this paper, the results indicate that the thrust efficiency of the 2D AF-MPDT can be improved with a strong applied crossed magnetic field.
  • KOIZUMI Hiroyuki, KUNINAKA Hitoshi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 8(ists27) Pb_85-Pb_90 2010年  査読有り
    Ion thrusters are promising propulsion devices not only for standard-sized spacecraft but also for small spacecraft. However, difficulty of the development of a miniature neutralizer has been a critical problem for miniature ion thrusters. We have proposed a novel ion thruster system to solve this problem. That is a switching operation, where a plasma source can select ion beam extraction or electron emission by electrical switching. The major challenge of this study is to find the method to effectively performs both functions from one plasma source. To match the system to small spacecraft, the both modes must be conducted using low microwave power and low mass flow as low as 1.0 W and 0.15 sccm. Firstly, fundamental characteristics of electron emission were investigated using an orifice plate. Based on this result, secondly, a special grid system for the switching operation was designed and examined. This grid system has two-different-size apertures for ions and electrons respectively. This grid showed high ion beam extraction performance, that is, 4.1 mA ion beam current at 1.0 W microwave power input. It also showed much higher electron current than the old grid system, although the electron current of 1.0 mA has not reached the targeted current yet. As a result, the experiment showed that the special grid system proposed here is an effective method to realize the switching operation.
  • TSUKIZAKI Ryudo, KOIZUMI Hiroyuki, HOSODA Satoshi, NISHIYAMA Kazutaka, KUNINAKA Hitoshi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 8(ists27) Pb_67-Pb_72 2010年  査読有り
    Based on the success of the Japanese asteroid explorer Hayabusa, the ECR ion thruster μ10 will be installed in Hayabusa's successor, Hayabusa-2, and is scheduled to be commercialized for use in geostationary satellites within the next three years. To increase the thrust force of the μ10 as much as possible without major design changes, luminescence measurements were conducted using an optical fiber probe. The probe gave an internal view of the μ10, and it was discovered that there was plasma in the waveguide. As the plasma, the density of which is higher than the cut-off density, interferes with the transmittance of microwaves, the propellant injection location was changed. In addition to the change in propellant injection location, the grid system was also refined. These improvements increased the thrust force from 8.0 mN to 10.1 mN with a decrease in specific impulse by 40 sec from 3200 sec to 3160 sec.
  • 小泉 宏之, 國中 均
    プラズマ応用科学 17(1) 33-38 2009年6月  査読有り最終著者
  • Masaki Ando, Seiji Kawamura, Shuichi Sato, Takashi Nakamura, Kimio Tsubono, Akito Araya, Ikkoh Funaki, Kunihito Ioka, Nobuyuki Kanda, Shigenori Moriwaki, Mitsuru Musha, Kazuhiro Nakazawa, Kenji Numata, Shin-ichiro Sakai, Naoki Seto, Takeshi Takashima, Takahiro Tanaka, Kazuhiro Agatsuma, Koh-suke Aoyanagi, Koji Arai, Hideki Asada, Yoichi Aso, Takeshi Chiba, Toshikazu Ebisuzaki, Yumiko Ejiri, Motohiro Enoki, Yoshiharu Eriguchi, Masa-Katsu Fujimoto, Ryuichi Fujita, Mitsuhiro Fukushima, Toshifumi Futamase, Katsuhiko Ganzu, Tomohiro Harada, Tatsuaki Hashimoto, Kazuhiro Hayama, Wataru Hikida, Yoshiaki Himemoto, Hisashi Hirabayashi, Takashi Hiramatsu, Feng-Lei Hong, Hideyuki Horisawa, Mizuhiko Hosokawa, Kiyotomo Ichiki, Takeshi Ikegami, Kaiki T Inoue, Koji Ishidoshiro, Hideki Ishihara, Takehiko Ishikawa, Hideharu Ishizaki, Hiroyuki Ito, Yousuke Itoh, Nobuki Kawashima, Fumiko Kawazoe, Naoko Kishimoto, Kenta Kiuchi, Shiho Kobayashi, Kazunori Kohri, Hiroyuki Koizumi, Yasufumi Kojima, Keiko Kokeyama, Wataru@Kokuyama, Kei Kotake, Yoshihide Kozai, Hideaki Kudoh, Hiroo Kunimori, Hitoshi Kuninaka, Kazuaki Kuroda, Kei-ichi Maeda, Hideo Matsuhara, Yasushi Mino, Osamu Miyakawa, Shinji Miyoki, Mutsuko Y Morimoto, Tomoko Morioka, Toshiyuki Morisawa, Shinji Mukohyama, Shigeo Nagano, Isao Naito, Kouji Nakamura, Hiroyuki Nakano, Kenichi Nakao, Shinichi Nakasuka, Yoshinori Nakayama, Erina Nishida, Kazutaka Nishiyama, Atsushi Nishizawa, Yoshito Niwa, Taiga Noumi, Yoshiyuki Obuchi, Masatake Ohashi, Naoko Ohishi, Masashi Ohkawa, Norio Okada, Kouji Onozato, Kenichi Oohara, Norichika Sago, Motoyuki Saijo, Masaaki Sakagami, Shihori Sakata, Misao Sasaki, Takashi Sato, Masaru Shibata, Hisaaki Shinkai, Kentaro Somiya, Hajime Sotani, Naoshi Sugiyama, Yudai Suwa, Rieko Suzuki, Hideyuki Tagoshi, Fuminobu Takahashi, Kakeru Takahashi, Keitaro Takahashi, Ryutaro Takahashi, Ryuichi Takahashi, Tadayuki Takahashi, Hirotaka Takahashi, Takamori Akiteru, Tadashi Takano, Keisuke Taniguchi, Atsushi Taruya, Hiroyuki Tashiro, Yasuo Torii, Morio Toyoshima, Shinji Tsujikawa, Yoshiki Tsunesada, Akitoshi Ueda, Ken-ichi Ueda, Masayoshi Utashima, Yaka Wakabayashi, Hiroshi Yamakawa, Kazuhiro Yamamoto, Toshitaka Yamazaki, Jun'ichi Yokoyama, Chul-Moon Yoo, Shijun Yoshida, Taizoh Yoshino
    Classical and Quantum Gravity 26(9) 094019-094019 2009年5月7日  査読有り
  • Shuichi Sato, Seiji Kawamura, Masaki Ando, Takashi Nakamura, Kimio Tsubono, Akito Araya, Ikkoh Funaki, Kunihito Ioka, Nobuyuki Kanda, Shigenori Moriwaki, Mitsuru Musha, Kazuhiro Nakazawa, Kenji Numata, Shin-ichiro Sakai, Naoki Seto, Takeshi Takashima, Takahiro Tanaka, Kazuhiro Agatsuma, Koh-suke Aoyanagi, Koji Arai, Hideki Asada, Yoichi Aso, Takeshi Chiba, Toshikazu Ebisuzaki, Yumiko Ejiri, Motohiro Enoki, Yoshiharu Eriguchi, Masa-Katsu Fujimoto, Ryuichi Fujita, Mitsuhiro Fukushima, Toshifumi Futamase, Katsuhiko Ganzu, Tomohiro Harada, Tatsuaki Hashimoto, Kazuhiro Hayama, Wataru Hikida, Yoshiaki Himemoto, Hisashi Hirabayashi, Takashi Hiramatsu, Feng-Lei Hong, Hideyuki Horisawa, Mizuhiko Hosokawa, Kiyotomo Ichiki, Takeshi Ikegami, Kaiki T Inoue, Koji Ishidoshiro, Hideki Ishihara, Takehiko Ishikawa, Hideharu Ishizaki, Hiroyuki Ito, Yousuke Itoh, Nobuki Kawashima, Fumiko Kawazoe, Naoko Kishimoto, Kenta Kiuchi, Shiho Kobayashi, Kazunori Kohri, Hiroyuki Koizumi, Yasufumi Kojima, Keiko Kokeyama, Wataru Kokuyama, Kei Kotake, Yoshihide Kozai, Hideaki Kudoh, Hiroo Kunimori, Hitoshi Kuninaka, Kazuaki Kuroda, Kei-ichi Maeda, Hideo Matsuhara, Yasushi Mino, Osamu Miyakawa, Shinji Miyoki, Mutsuko Y Morimoto, Tomoko Morioka, Toshiyuki Morisawa, Shinji Mukohyama, Shigeo Nagano, Isao Naito, Kouji Nakamura, Hiroyuki Nakano, Kenichi Nakao, Shinichi Nakasuka, Yoshinori Nakayama, Erina Nishida, Kazutaka Nishiyama, Atsushi Nishizawa, Yoshito Niwa, Taiga Noumi, Yoshiyuki Obuchi, Masatake Ohashi, Naoko Ohishi, Masashi Ohkawa, Norio Okada, Kouji Onozato, Kenichi Oohara, Norichika Sago, Motoyuki Saijo, Masaaki Sakagami, Shihori Sakata, Misao Sasaki, Takashi Sato, Masaru Shibata, Hisaaki Shinkai, Kentaro Somiya, Hajime Sotani, Naoshi Sugiyama, Yudai Suwa, Rieko Suzuki, Hideyuki Tagoshi, Fuminobu Takahashi, Kakeru Takahashi, Keitaro Takahashi, Ryutaro Takahashi, Ryuichi Takahashi, Tadayuki Takahashi, Hirotaka Takahashi, Takamori Akiteru, Tadashi Takano, Keisuke Taniguchi, Atsushi Taruya, Hiroyuki Tashiro, Yasuo Torii, Morio Toyoshima, Shinji Tsujikawa, Yoshiki Tsunesada, Akitoshi Ueda, Ken-ichi Ueda, Masayoshi Utashima, Yaka Wakabayashi, Hiroshi Yamakawa, Kazuhiro Yamamoto, Toshitaka Yamazaki, Jun'ichi Yokoyama, Chul-Moon Yoo, Shijun Yoshida, Taizoh Yoshino
    Journal of Physics: Conference Series 154 012040-012040 2009年3月1日  査読有り
  • NAKATA Daisuke, TOKI Kyoichiro, SHIMIZU Yukio, FUNAKI Ikkoh, KUNINAKA Hitoshi, ARAKAWA Yoshihiro
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 7(26) Pb_95-Pb_99 2009年  
    The total electrode fall voltage in a channel of magnetoplasmadynamic (MPD) thruster was determined by using "zero-limit approximating method", which is one of the classical methods widely used in the arc welding field. A new five-channel parallel-plate MPDT was designed and operated in a quasi-steady mode. This paper presents the measurement of the discharge voltage vs. the electrode gap for gaps from 1 mm to 4 mm. The extrapolated zero-gap intercept resulted in 18 V, which was considered as the total electrode-fall voltage. The electrode-fall voltage did not depend on the discharge current unless the discharge current exceeded onset threshold. It is considered that most of the electrode fall is deposited on the cathode side since the space potential at the inter-electrode region was almost equal to the anode potential.
  • Yasuhiro Kawakatsu, Hitoshi Kuninaka, Kazutaka Nishiyama
    SPACEFLIGHT MECHANICS 2009, VOL 134, PTS I-III 134 801-812 2009年  査読有り
  • Hideyuki Usui, Koujiro Imasato, Hitoshi Kuninaka
    RAREFIED GAS DYNAMICS 1084 877-+ 2009年  査読有り
  • Koizumi, H, Kuninaka, H
    Advances in Applied Plasma Science 7 51-54 2009年  査読有り最終著者
  • KOIZUMI Hiroyuki, KUNINAKA Hitoshi
    JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 57(665) 234-243 2009年  査読有り最終著者
  • NISHIYAMA Kazutaka, HOSODA Satoshi, USUI Miyuki, TSUKIZAKI Ryudo, HAYASHI Hiroshi, SHIMIZU Yukio, KUNINAKA Hitoshi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 7(ists26) Pb_113-Pb_118 2009年  査読有り
    In order to adapt to a wide variety of the space flights, such as small geosynchronous satellites and deep space explorers, feasibility study of performance enhancement options for the microwave discharge ion thruster µ10 is underway. Authors are considering the following five options: 1. Lower insertion loss DC blocks; 2. Direct monopole antenna insertion to the discharge chamber without using a circular waveguide part; 3. Optimization of gas injector layout which was originally located deep in the waveguide; 4. Additional magnet rings aiming ion loss reduction to the side wall of the discharge chamber; 5. New ion optics consists of a thinner screen grid and a smaller-hole accelerator grid. Not all but most of them have already been tested and reported in this article. The original models for Hayabusa asteroid explorer generated 8 mN at maximum. Larger thrust generation was impossible even if propellant flow rates and microwave powers were increased. It turned out to be feasible to increase the maximum thrust to a range of 10 - 11 mN with above mentioned options by supplying more flow rates and/or more microwave powers.
  • Takefumi SAITO, Hiroyuki KOIZUMI, Hitoshi KUNINAKA
    J. Plasma Fusion Res. SERIES 8 2009年  査読有り
  • HAYASHI Hiroshi, NAKAYAMA Yoshinori, USUI Miyuki, KOIZUMI Hiroyuki, HOSODA Satoshi, SHIMIZU Yukio, NISHIYAMA Kazutaka, KUNINAKA Hitoshi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 7(ists26) Tb_1-Tb_4 2009年  査読有り
    Institute of Space and Astronautical Science of Japan Aerospace Exploration Agency (ISAS/JAXA) successfully developed and operated the microwave discharge ion engines "µ10" onboard Hayabusa asteroid explorer. The µ10 ion engines feature the cathode-less plasma generation in both the ion sources and neutralizers with the results of long life and high reliability in space. Based on the space achievements of µ10 ion engines with 8mN thrust, 3,000sec Isp and 350W consumption power, the µ10HIsp is under development for deep space missions to such as Jupiter and Mercury. The integrated test with the plasma sources, a propellant isolator, a microwave DC block and a high Isp grid system established the thrusting operation with 9,600sec Isp using 15kV acceleration voltage, 25mN thrust, 12mN/kW thrust power ratio, and 2.1kW power consumption.
  • KOIZUMI Hiroyuki, KUNINAKA Hitoshi
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN 7(ists26) Pb_89-Pb_94 2009年  査読有り
    In this study, we are proposing a novel miniaturized ion engine system µ1. Recently microspacecraft and propulsion system to be installed there have attracted a lot of attentions. To accomplish the miniaturization of spacecraft component, multifunctionalization of devices are key technologies. The ion engine we are proposing here is distributed on microspacecraft and give a number of functions and strong redundancy to the spacecraft. To realize this concept, we introduced a novel idea for an ion engine system. That is to use single plasma source as both ion beam source and neutralizing electron source only by electrical connection. This ion engine system is released from the necessity of a number of neutralizers. Our concept requires a plasma source driven by very low power microwave. Here we proposed an antenna design method for a small plasma source using microwave discharge, and developed a miniaturized ion engine. As a result, the performance of the miniaturized ion engine was improved up to the ion production cost of 240 V and propellant utilization efficiency of 40 % at the input microwave power of 1.0 W and mass flow rate of 0.15 sccm.
  • Kazutaka Nishiyama, Hitoshi Kuninaka
    Surface and Coatings Technology 202(22-23) 5262-5265 2008年8月30日  査読有り最終著者
  • M Ando, S Kawamura, T Nakamura, K Tsubono, T Tanaka, I Funaki, N Seto, K Numata, S Sato, K Ioka, N Kanda, T Takashima, K Agatsuma, T Akutsu, T Akutsu, K-s Aoyanagi, K Arai, Y Arase, A Araya, H Asada, Y Aso, T Chiba, T Ebisuzaki, M Enoki, Y Eriguchi, M-K Fujimoto, R Fujita, M Fukushima, T Futamase, K Ganzu, T Harada, T Hashimoto, K Hayama, W Hikida, Y Himemoto, H Hirabayashi, T Hiramatsu, F-L Hong, H Horisawa, M Hosokawa, K Ichiki, T Ikegami, K T Inoue, K Ishidoshiro, H Ishihara, T Ishikawa, H Ishizaki, H Ito, Y Itoh, S Kamagasako, N Kawashima, F Kawazoe, H Kirihara, N Kishimoto, K Kiuchi, S Kobayashi, K Kohri, H Koizumi, Y Koima, K Kokeyama, W-Kokuyama, K Kotake, Y Kozai, H Kudoh, H Kunimori, H Kuninaka, K Kuroda, K-i Maeda, H Matsuhara, Y Mino, O Miyakawa, S Miyoki, M Y Morimoto, T Morioka, T Morisawa, S Moriwaki, S Mukohyama, M Musha, S Nagano, I Naito, N Nakagawa, K Nakamura, H Nakano, K Nakao, S Nakasuka, Y Nakayama, E Nishida, K Nishiyama, A Nishizawa, Y Niwa, M Ohashi, N Ohishi, M Ohkawa, A Okutomi, K Onozato, K Oohara, N Sago, M Saijo, M Sakagami, S-i Sakai, S Sakata, M Sasaki, T Sato, M Shibata, H Shinkai, K Somiya, H Sotani, N Sugiyama, Y Suwa, H Tagoshi, K Takahashi, K Takahashi, T Takahashi, H Takahashi, R Takahashi, R Takahashi, A Takamori, T Takano, K Taniguchi, A Taruya, H Tashiro, M Tokuda, M Tokunari, M Toyoshima, S Tsujikawa, Y Tsunesada, K-i Ueda, M Utashima, H Yamakawa, K Yamamoto, T Yamazaki, J Yokoyama, C-M Yoo, S Yoshida, T Yoshino
    Journal of Physics: Conference Series 120(3) 032005-032005 2008年7月1日  査読有り
  • S Kawamura, M Ando, T Nakamura, K Tsubono, T Tanaka, I Funaki, N Seto, K Numata, S Sato, K Ioka, N Kanda, T Takashima, K Agatsuma, T Akutsu, T Akutsu, K-s Aoyanagi, K Arai, Y Arase, A Araya, H Asada, Y Aso, T Chiba, T Ebisuzaki, M Enoki, Y Eriguchi, M-K Fujimoto, R Fujita, M Fukushima, T Futamase, K Ganzu, T Harada, T Hashimoto, K Hayama, W Hikida, Y Himemoto, H Hirabayashi, T Hiramatsu, F-L Hong, H Horisawa, M Hosokawa, K Ichiki, T Ikegami, K T Inoue, K Ishidoshiro, H Ishihara, T Ishikawa, H Ishizaki, H Ito, Y Itoh, S Kamagasako, N Kawashima, F Kawazoe, H Kirihara, N Kishimoto, K Kiuchi, S Kobayashi, K Kohri, H Koizumi, Y Kojima, K Kokeyama, W Kokuyama, K Kotake, Y Kozai, H Kudoh, H Kunimori, H Kuninaka, K Kuroda, K-i Maeda, H Matsuhara, Y Mino, O Miyakawa, S Miyoki, M Y Morimoto, T Morioka, T Morisawa, S Moriwaki, S Mukohyama, M Musha, S Nagano, I Naito, N Nakagawa, K Nakamura, H Nakano, K Nakao, S Nakasuka, Y Nakayama, E Nishida, K Nishiyama, A Nishizawa, Y Niwa, M Ohashi, N Ohishi, M Ohkawa, A Okutomi, K Onozato, K Oohara, N Sago, M Saijo, M Sakagami, S-i Sakai, S Sakata, M Sasaki, T Sato, M Shibata, H Shinkai, K Somiya, H Sotani, N Sugiyama, Y Suwa, H Tagoshi, K Takahashi, K Takahashi, T Takahashi, H Takahashi, R Takahashi, R Takahashi, A Takamori, T Takano, K Taniguchi, A Taruya, H Tashiro, M Tokuda, M Tokunari, M Toyoshima, S Tsujikawa, Y Tsunesada, K-i Ueda, M Utashima, H Yamakawa, K Yamamoto, T Yamazaki, J Yokoyama, C-M Yoo, S Yoshida, T Yoshino
    Journal of Physics: Conference Series 120(3) 032004-032004 2008年7月1日  査読有り
  • 小泉 宏之, 國中 均
    プラズマ応用科学 16(1) 15-20 2008年6月  査読有り最終著者
  • Junichiro Kawaguchi, Osamu Mori, Hitoshi Kuninaka, Takashi Kominato, Kenichi Shirakawa
    Advances in the Astronautical Sciences 130 PART 2 1133-1148 2008年  
  • Hitoshi Kuninaka, Jun'ichiro Kawaguchi
    SENSORS AND SYSTEMS FOR SPACE APPLICATIONS II 6958 XI-XX 2008年  査読有り
  • Hitoshi Kuninaka, Jun'ichiro Kawaguchi
    MICRO (MEMS) AND NANOTECHNOLOGIES FOR SPACE, DEFENSE, AND SECURITY II 6959 2008年  査読有り
  • Hitoshi Kuninaka, Jun'ichiro Kawaguchi
    SPACE EXPLORATION TECHNOLOGIES 6960 2008年  査読有り
  • Hitoshi Kuninaka
    BEAMED ENERGY PROPULSION 997 572-581 2008年  査読有り
  • Jun'ichiro Kawaguchi, Osamu Mori, Hitoshi Kuninaka, Takashi Kominato, Kenichi Shirakawa
    SPACEFLIGHT MECHANICS 2008, VOL 130, PTS 1 AND 2 130 1133-+ 2008年  査読有り
  • Satoshi Hosoda, Takanobu Muranaka, Hitoshi Kuninaka, Jeongho Kim, Shinji Hatta, Naomi Kurahara, Mengu Cho, Hiroko O. Ueda, Kiyokazu Koga, Tateo Goka
    IEEE Transactions on Plasma Science 36(5) 2350-2359 2008年  査読有り
  • Hitoshi Kuninaka, Kazutaka Nishiyama, Ikko Funaki, Tetsuya Yamada, Yukio Shimizu, Jun'ichiro Kawaguchi
    JOURNAL OF PROPULSION AND POWER 23(3) 544-551 2007年5月  査読有り
  • Kazutaka Nishiyama, Yukio Shimizu, Ikkoh Funaki, Hitoshi Kuninaka, Kyoichiro Toki
    JOURNAL OF PROPULSION AND POWER 23(3) 513-521 2007年5月  査読有り
  • Yoshinori Nakayama, Ikkoh Funaki, Hitoshi Kuninaka
    JOURNAL OF PROPULSION AND POWER 23(2) 495-499 2007年3月  査読有り
  • Kimiya Komurasaki, Hitoshi Kuninaka
    Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference 2 1612-1624 2007年  
  • Daisuke Nakata, Kyoichiro Toki, Ikkoh Funaki, Yukio Shimizu, Hitoshi Kuninaka, Yoshihiro Arakawa
    Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference 3 2774-2786 2007年  
  • Daisuke Nakata, Kyoichiro Toki, Ikkoh Funaki, Yukio Shimizu, Hitoshi Kuninaka, Yoshihiro Arakawa
    Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting 10 7094-7104 2007年  
  • H. Kuninaka, K. Nishiyama, I. Funaki, T. Yamada, Y. Shimizu, J. Kawaguchi
    Journal of Space Technology and Science 22(1) 1-10 2007年  査読有り
  • 桑野, 國中, 中島
    日本航空宇宙学会論文集 55(639) 188-194 2007年  査読有り
  • 林, 碓井, 中山, 清水, 西山, 國中
    日本航空宇宙学会論文集 55(647) 604-611 2007年  査読有り
  • Hitoshi Kuninaka, Kazutaka Nishiyama, Ikko Funaki, Yukio Shimizu, Tetsuya Yamada, Jun'ichiro Kawaguchi
    IEEE TRANSACTIONS ON PLASMA SCIENCE 34(5) 2125-2132 2006年10月  査読有り

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 68
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 5
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 190
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  • 2005年4月 - 2018年3月
    電気推進工学  (東京大学大学院宇宙航空学専攻)
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 9
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 17
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 17
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