Technology demonstration and elemental technology development of Space Solar Power Systems (SSPS)
- Paper number
IAC-08.C3.2.4
- Author
Dr. Hiroaki Suzuki, Japan Aerospace Exploration Agency (JAXA), Japan
- Coauthor
Mr. Tatsuhito Fujita, Japan Aerospace Exploration Agency (JAXA), Japan
- Coauthor
Mr. Masahiro Mori, Japan Aerospace Exploration Agency (JAXA), Japan
- Year
2008
- Abstract
Japan Aerospace Exploration Agency (JAXA) has studied Space Solar Power Systems (SSPS) using laser and microwave beams for years since 1998. Current SSPS study undertaken by JAXA consists of three main subjects, SSPS concepts and architectures study, technology demonstration and elemental technology development. In current research of Laser based SSPS (L-SSPS), we have studied some elemental technologies such as the laser generator based on the direct solar pumping solid-state laser diode, the transmittal properties of high energy laser beam, the film mirror used for the solar condenser mirror, the wavelength selective mirror used for the secondary condenser mirror, the space heat radiation technology, the high-efficiency photovoltaic device converting laser energy into electricity and the photocatalytic hydrogen generation system. For the laser transmission technology, we consider the wavelength of 1064nm to be the first candidate of transmitted wavelength. Because this wavelength has high air transmittance and various application in the ground such as direct hydrogen generation, photovoltaic generation and heat application. In the laser generator, an active mirror system is chosen as the laser amplification method, and Nd/Cr-YAG ceramics are chosen as laser medium. Because the heat radiation of active mirror method is easier than that of other methods as the rod or the fiber, and the Nd/Cr-YAG ceramic can efficiently amplify the laser beam of 1064 nm compared with other laser materials. Therefore, the active mirror type Nd/Cr-YAG ceramic laser is expected as high-efficiency laser generator. In the research of photocatalytic hydrogen generation using the L-SSPS, we assume the directly hydrogen generation from hydrogen sulfide. So the hydrogen generation at the sulfur circulation from the hydrogen sulfide by the laser beam of 1064 nm is studied. This paper presents the introduction of SSPS concepts and architectures study and the results of technology demonstration and elemental technology development for L-SSPS.
- Abstract document
- Manuscript document
IAC-08.C3.2.4.pdf (🔒 authorized access only).
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