Curriculum Vitaes
Profile Information
- Affiliation
- Professor, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Degree
- 博士(工学)(Mar, 1998, 東京大学)
- Researcher number
- 60342622
- ORCID ID
https://orcid.org/0000-0002-9224-893X- J-GLOBAL ID
- 202001002398782568
- researchmap Member ID
- R000014180
- External link
Research History
8-
Dec, 2023 - Present
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Dec, 2018 - Nov, 2023
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Oct, 2003 - Mar, 2006
Education
2Committee Memberships
6-
May, 2025 - Present
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2023 - Present
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May, 2022 - Present
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Jun, 2023 - Apr, 2025
Awards
1Papers
290-
Journal of Physics: Conference Series, 154, 2009
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47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2009
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60th International Astronautical Congress 2009, IAC 2009, 2 1323-1330, 2009
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Advances in the Astronautical Sciences, 134 801-812, 2009
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60th International Astronautical Congress 2009, IAC 2009, 7 5741-5747, 2009 Lead author
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航空原動機・宇宙推進講演会講演論文集(CD-ROM), 49th, 2009 Lead author
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航空原動機・宇宙推進講演会講演論文集(CD-ROM), 49th, 2009
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航空原動機・宇宙推進講演会講演論文集(CD-ROM), 49th, 2009
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Surface and Coatings Technology, 202(22-23) 5262-5265, Aug 30, 2008 Peer-reviewedLead author
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Journal of Physics: Conference Series, 122(Part 3) 2393-2397, 2008
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44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2008 Lead author
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44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2008 Lead author
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JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 55(647) 604-611, Dec 5, 2007An ion engine with 10,000sec-class high specific impulse is expected as primary propulsion for interplanetary space mission with extremely high delta-V, and needs high voltage for ion acceleration over 10kV. The microwave discharge ion source without solid electrodes can supply sophisticated technologies and simple composition on electrical isolation for such a high voltage. New electro-static grid made of carbon-carbon composite material was fabricated based on the numerical simulation of “igx” code. The “μ10HIsp” ion engine combining the ECR ion source, microwave discharge neutralizer, DC blocks, propellant isolators, carbon-carbon composite grid and so on generated successfully a plasma beam with 10,000sec specific impulse using 15kV acceleration voltage.
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JOURNAL OF PROPULSION AND POWER, 23(3) 513-521, May, 2007 Peer-reviewedLead author
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Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2 1885-1891, 2007
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Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting, 22 15409-15413, 2007
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Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 3 2894-2905, 2007
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宇宙科学技術連合講演会講演集(CD-ROM), 51st, 2007
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宇宙科学技術連合講演会講演集(CD-ROM), 51st, 2007 Lead author
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Journal of Propulsion and Power, 23(3) 544-551, 2007 Peer-reviewed
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IEEE Transactions on Plasma Science, 34(5 II) 2125-2132, Oct, 2006 Peer-reviewed
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Thin Solid Films, 506-507 588-591, May 26, 2006 Peer-reviewedLead author
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Journal of Geophysical Research: Space Physics, 111(4), Apr, 2006 Peer-reviewed
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宇宙航空研究開発機構特別資料 JAXA-SP-, (5) 82-86, Feb 28, 2006Along with the development of microwave discharge ion engines, it is necessary that a analysis model of the ion sources is developed. As the first stage, probe measurements of the ion source of micro 20, which is under the development now, were done. In the discharge chamber of micro 20, it is expected that a certain circumferential distribution is exist because of the magnetic field and the gas ports in the discharge chamber. In this research, we got the distribution between inside magnet rows, which indicated an increase in electron temperatures and a decrease in plasma densities along the direction of the Delta B drift of electrons. Moreover, it is found that electron temperatures and plasma densities change in two different cases of the locations of the gas ports. These results show that the best shape of the discharge chamber can improve the performance improvement of micro 20.
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The Journal of Space Technology and Science, 22(1) 1_1-1_10, 2006The microwave discharge ion engine “μ10” has a long life and high reliability because of electrodeless plasma generation in both the ion generator and the neutralizer. A single μ10 generates a thrust of 8 mN, specific impulse of 3,200 seconds, and consuming 350 W of electric power. Four μ10s propelled the “Hayabusa” asteroid explorer, launched on May 2003, combining a new orbit change scheme “Delta-V Earth Gravity Assist”. In 2005, Hayabusa, using solar electric propulsion, managed to successfully cover the distance between 0.86 AU and 1.7 AU from Sun in the solar system, as well as rendezvous with, land on, and lift off from the asteroid Itokawa. During the 2-year flight, the ion engine system generated a delta-V of 1,400 m/s while consuming 22 kg of xenon propellant and operating for 25,800 hours. Hayabusa solved failures of reaction wheels and chemical thrusters by means of xenon cold gas jet from the ion engine system and aims to return to Earth in 2010.
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Collection of Technical Papers - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference, 1 151-164, 2006
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AIAA 57th International Astronautical Congress, IAC 2006, 10 6765-6770, 2006 Lead author
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AIAA 57th International Astronautical Congress, IAC 2006, 9 6321-6327, 2006
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Collection of Technical Papers - AIAA/ASME/SAE/ASEE 42nd Joint Propulsion Conference, 10 8160-8171, 2006
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(5) 12-18, Aug 1, 2005The microwave discharge ion engines 'micro10s' are devoted to the main propulsion on 'HAYABUSA' asteroid explorer. In the development program various kinds of tests and assessments were applied to the ion engines and the spacecraft; the endurance test, the EMI susceptibility test, the interference test between plasma and communication microwave, the beam exhaust test on the spacecraft, the assessment on plasma interference with solar array, so on. The spacecraft was input in the deep space by M-V rocket on May 9, 2003. After vacuum exposure and several runs of baking for reduction of residual gas the ion engine system established the continuous acceleration of the spacecraft toward the asteroid 'ITOKAWA'. On the beginning of December 2004 the ion engines reached the total number of space operational time 20,000 hour. And the spacecraft passed by the aphelion 1.7 astronautical unit on February 18, 2005 so that the microwave discharge ion engine micro10s became the electric propulsion to arrive at the furthest space from Sun. It will rendezvous with the target asteroid on September 2005.
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Aeronautical and Space Sciences Japan, 53(618) 203-210, Jul 5, 2005 Peer-reviewed
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41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2005
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SPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 4(4) 21-27, 2005 Peer-reviewedLead authorA completely new solar electric propulsion concept, the Air Breathing Ion Engine (ABIE), has been proposed for spacecraft drag makeup at very low altitudes, ranging from 150 to 200 km. ABIE scoops up neutral atoms and molecules traveling at an orbital velocity of approximately 8 km/s, ionizes them by means of an electron cyclotron resonance plasma source that is efficient in a wide range of low gas pressures, and accelerates the ionized air particles electrostatically to exhaust velocities larger than 100 km/s. The key technology of this thruster is the design of a propellant inlet which allows the incoming flow to enter the discharge chamber, yet it prevents the thermalized gas from escaping upstream. In this system, an air-breathing-type neutralizer may also be employed, in which case the need to carry on-board xenon propellant is eliminated and results in gains in payload mass if the mission duration is longer than 2 years. This technology should give researchers access to a part of the atmosphere that is currently very difficult to measure and is thus called the "ignorosphere." Promising applications other than aeronomy include science missions involving accurate gravity and magnetic field mapping, and high-resolution Earth surveillance.
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宇宙科学技術連合講演会講演集(CD-ROM), 49th, 2005 Lead author
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JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 52(610) 528-534, Nov 5, 2004 Peer-reviewedIn recent years, concern has been raised about the interference phenomena (chemical reaction, sputtering etc.) between ionospheric plasma and high-voltage space systems such as the International Space Station and so on. In order to solve the physical mechanisms of these phenomena and establish the prevention technology, it is important to accumulate experimental data based on ground simulation tests. Therefore we have developed a cathode-less microwave discharge oxygen ion source for an ionospheric plasma simulator. The oxygen ion source for ionospheric plasma simulation demands plasma density more than 1012m- 3 and high durability (our target is more than 70hours). This ion source is capable of generating oxygen plasma of the order of 1014m- 3 for more than 100hours with 25W microwave power and 3sccm oxygen gas. In order to investigate the operational performance of the oxygen ion source, we conduct various measurement tests such as plasma diagnosis using a single probe, ionic mass spectroscopy by a Quadrupole Mass Spectrometer (QMS), atomic oxygen flux measurement using a silver coated QCM (Quartz Crystal deposition Monitor) and 70hours operating test etc. This paper reports the experimental results of each measurement tests and assesses performance as an ion source for ionospheric plasma simulator.
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JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 52(602) 129-134, Mar 5, 2004 Peer-reviewedThe microwave discharge ion engine generates plasmas of the main ion source as well as the neutralizer using 4GHz microwave without discharge electrodes and hollow cathodes, so that long life and durability against oxygen and air are expected. MUSES-C “HAYABUSA” spacecraft installing four microwave discharge ion engines was launched into deep space by M-V rocket on May 9, 2003. After vacuum exposure and several runs of baking for reduction of residual gas the ion engine system established the continuous acceleration of the spacecraft toward an asteroid. The Doppler shift measurement of the communication microwave revealed the performance of ion engines, which is 8mN thrust force for a single unit with 3,200sec specific impulse at 23mN/kW thrust power ratio. At the beginning of December 2003 the accumulated operational time exceeded 7,000 hours and units.
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40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2004
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International Astronautical Federation - 55th International Astronautical Congress 2004, 1 653-662, 2004 Lead author
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Meeting Abstracts of the Physical Society of Japan, 59 233-233, 2004
Misc.
75-
日本惑星科学会誌 遊・星・人, 33(1), 2024
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宇宙科学技術連合講演会講演集(CD-ROM), 67th, 2023
Books and Other Publications
2Teaching Experience
3-
Oct, 2019 - Present
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Apr, 2019 - Present
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Apr, 2017 - Present
Professional Memberships
1Research Projects
11-
Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2023 - Mar, 2027
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2025
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2022 - Mar, 2025
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Grants-in-Aid for Scientific Research, Japan Society for the Promotion of Science, Apr, 2015 - Mar, 2018
Media Coverage
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JAXA/ISAS, Oct, 2025 Internethttps://www.isas.jaxa.jp/home/research-portal/en/news/2025/1009/