研究者詳細 - 増井　博一

論文 - 増井　博一

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Mission results of high voltage technology demonstration satellite "HORYU-2 査読有り

Iwai S., Khan A., Masui H., Iwata M., Toyoda K., Cho M.

Proceedings of the International Astronautical Congress, IAC 12 9377 - 9391 2013年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The World's largest spacecraft bus voltage is the International Space Station (ISS) with a bias voltage of 160V. We have investigated a power bus able to handle higher voltage than the ISS. Electro-static discharges (ESDs) are more likely to occur when a satellite generates power at a high voltage rather than low voltage in low Earth orbit (LEO). However, high voltage generation is essential for building large space systems. Therefore, Kyushu Institute of Technology (Kyutech) is developing a high voltage generation technology that could counteract ESDs. This could be considered as a key technology for next generation spacecraft. Nano-satellites are useful and less risky tools for technology demonstration since they are faster and less expensive to develop than large satellites. Therefore, we focused on nano-satellite development to demonstrate Kyutech's advanced high voltage generation technology. All of the on-orbit high voltage tests have been demonstrated by using a DC/DC converter to adapt the high voltage generated by the solar array. This was a World premiere as no high voltage tests had previously been performed in space using solar arrays. To demonstrate the feasibility of on-orbit high voltage generation, we developed a High Voltage Technology Demonstration Satellite named HORYU-2. The mission consisted of 300V generation without causing arcing, and contribution to the practical development of 1MW class spacecraft. On May 18, 2012, HORYU-2 was launched by the H-2A rocket number 21. HORYU-2 has been operated from Kyutech's ground station, and HORYU-2's orbit was confirmed and the mission successful. For the first time in the World, 350V have been generated on-orbit without arc creation. Using two specially designed solar arrays arcing was mitigated. Regarding the sub-missions, ELF was proven to work well on-orbit, Trek measurements are currently under investigation, the SCAMP camera successfully imaged Earth, and the debris sensor has not yet detected debris impact. During the conference, we will present all mission analysis in further detail. Copyright ©2013 by the International Astronautical Federation.

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Measurement of atomic-oxygen flux distribution 査読有り

Hisashiba T., Kuroda K., Masui H., Iwata M., Toyoda K., Cho M.

Astrophysics and Space Science Proceedings 32 597 - 606 2013年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© Springer-Verlag Berlin Heidelberg 2013. Since material surfaces on the outside of spacecraft are exposed directly to the space environment, material having high tolerance to atomic oxygen, ultraviolet rays and radiation are preferred for long time spacecraft operation. In order to examine the influence of atomic oxygen (AO) on space grade materials, an atomic oxygen simulation chamber was developed. A system was developed that generates AO using a laser detonation method. A CO2gas laser (5 J) irradiates the oxygen gas in a vacuum chamber (2 MPa) to dissociate the molecular oxygen into atomic. The velocity of AO can be controlled based on the timing between the laser and the gas pulse valve that injects oxygen gas into the chamber. The AO velocity generated by this system is measured using a QMASS (Quadruple Mass Spectrometer) and found to be 8 km/s. It was necessary to measure the AO flux distribution in the chamber at the location where the material samples are exposed to AO. The AO flux distribution was evaluated by measuring the mass gain on a QCM (QuartzCrystal Micro-balance) coated with a silver film upon exposure to the AO.

DOI： 10.1007/978-3-642-30229-9_56

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Development of mission payloads onboard high voltage technology demonstration satellite HORYU-II 査読有り

Yoke T., Khan A., Masui H., Iwata M., Toyoda K., Cho M.

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition 2012年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

High Voltage Technology Demonstration Satellite HORYU-II is a Nano-Satellite (30cm cubic shape, 7kg) being developed by the students in Kyushu Institute of Technology. One of the objectives of this satellite is orbital demonstration of forthcoming space high-voltage technologies. The satellite with the highest voltage generation in Low Earth Orbit has been ISS, generating 160V. On orbit, especially LEO, high-voltage (over about 200V) generally induces electro-static discharges (ESD). HORYU-II is aimed to demonstrate new designs of solar array that can generate power, free of ESD, by producing 300V via a specially designed solar array itself, not via a conventional DC/DC converter. If successful, HORYU-II will become the first spacecraft in the world that achieved 300V photovoltaic power generation in space. Copyright © 2012 by the American Institute of Aeronautics and Astronautics, Inc.

DOI： 10.2514/6.2012-719

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Preliminary report on on-orbit experiment on high voltage technology demonstration satellite, HORYU-II 査読有り

Takahashi A., Khan A., Masui H., Iwata M., Toyoda K., Cho M.

Proceedings of the International Astronautical Congress, IAC 12 9657 - 9667 2012年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

A cubic nano-satellite with a length of 30 cm, named HORYU-II, was developed at Kyushu Institute of Technology in Japan. HORYU-II is a demonstration satellite for high voltage technology and its two main advantages are its low cost and short time development. HORYU-II's main mission is to demonstrate the possible generation of 300V on-orbit by using spherical solar cells connected in series. This mission can be considered as the first high voltage technology demonstration in the world. To control arcing under negative 300V in space plasma, ETFE (ethylene tetra flouro ethylene) cover and semi-conductive coated solar array efficiency will be demonstrated. Along with this, charging mitigation of spacecraft by using electron emitting film, operation of commercial-off-the-shelf (COT) surface potentiometer will also be demonstrated. HORYU-II was launched by a H-IIA rocket on May 18, 2012. We have been acquiring on-orbit data and monitoring the satellite conditions. HORYU-II succeeded in generating the highest 300V photovoltaic voltage in space for the first time in the world. However, many problems were found during data collection. In this paper, the result of HORYU-II's missions is described.

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Discharge observation on antenna surface radiating high power microwave in plasma environment 査読有り

Woo H., Khan A., Masui H., Cho M., Miyakawa T., Fujita T.

Proceedings of the International Astronautical Congress, IAC 9 7029 - 7037 2012年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Space Solar Power System (SSPS) transfers enormous amount of electrical energy through microwave. Flight demonstration onboard a small satellite in Low Earth Orbit (LEO) is now under consideration. When a high power microwave is irradiated from antenna in LEO plasma environment, there is a concern about discharge caused by interaction between the plasma and the microwave. There has been no experimental observation on such interaction phenomenon. Verification experiment is essential for SSPS to become a reality. We have set-up an experimental system that can simulate the radiation of high power microwave under dense plasma in a vacuum chamber. A RF plasma source was installed to the chamber that we filled with Argon plasma environment of density from 1011 to 10 m' with 4eV to 6eV temperature under a back pressure of 2.6x10" Pa. A patch antenna made of Glass epoxy substrate was installed inside the chamber. The antenna was connected to a magnetron that could produce 5.8GHz microwave. We monitored the antenna surface temperature, the radiated and reflected power, the chamber pressure and others while we injected the microwave to the antenna up to 45W. We examined whether discharge or related phenomena occur or not on the patch antennas for various conditions to verify the hypothesis of discharge inception that discharge is caused by multi-pactoring and breakdown of the outgas product. Copyright © (2012) by the International Astronautical Federation.

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Environment Test Campaign of Micro/Nano-Satellite Power Control Unit 査読有り

K. Okada, T. Motohata, T. Hatamura, S. Obata, H. Masui, M. Cho

4th UN-Japan Nano-Satellite Symposium 2012年10月

Discharge observation on antenna surface radiating high power microwave in plasma environment 査読有り

H. Woo, A. R. Khan, H. Masui, M. Cho, T. Miyakawa, T. Fujita

63rd International Astronautical Congress 2012年10月

Preliminary Report on On-orbit Experiment on High Voltage Technology Demonstration Satellite, HORYU-II 査読有り

A. Takahashi, A. R. Khan, M. Hirokazu, M. Iwata, K. Toyoda, M. Cho,

63rd International Astronautical Congress 2012年10月

nvironment Test Campaign of Micro/Nano-Satellite Radio Frequency Components 査読有り

K. Tomida, T. Hatamura, H. Masui, M. Cho

4th UN-Japan Nano-Satellite Symposium 2012年10月

On-orbit Demonstration of High Voltage Technology Mission in HORYU-II 査読有り

A. Takahashi, A. R. Khan, M. Hirokazu, M. Iwata, K. Toyoda, M. Cho

4th UN-Japan Nano-Satellite Symposium 2012年10月

Path finder radiation test suitable for micro or nano satellite 査読有り

Y. Okumura, M. Cho, H. Masui

4th UN-Japan Nano-Satellite Symposium 2012年10月

Measurement of vibration acceleration distribution within micro/nano satellites for environment test standardization 査読有り

A. Batsuren, T. Hatamura, H. Masui, M. Cho

4th UN-Japan Nano-Satellite Symposium 2012年10月

Status of Micro/Nano satellite Environmental Tests Standardization Project: Test Campaign and Standard Draft 査読有り

M. Cho, H. Masui, T. Hatamura, K. Date, S. Horii, S. Obata

4th Nanosatellite Symposium 2012年10月

Overview of Nano-satellite Environmental Tests Standardization Project: Test Campaign and Standard Draft 査読有り

M. Cho, H. Masui, T. Hatamura, K. Date, S. Horii, S. Obata

26th Small Satellite Conference 2012年08月

Research on mitigation method against secondary arcing on solar array by capacitor and inductance 査読有り

I. Haruta, H. Masui, K. Toyoda, M. Cho