Space & Astronautical Science, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan, Dec. 13-14, 1982. (Paper No. II-3) Authors: Tanatsugu, Nobuhiro; (Institute of Space and Astronau t i cal Science> Keywords: space energy conversion, alternative systems, solar cells Abstract: Major electric power systems currently used in various space applications utilize the solar cell, which converts directly a solar energy to an electric energy by means of the photovoltaic effect. A solar cell has higher reliablity and safety compared with other options because it does not have any ATTACHMENT : moving parts in the conversion mechanisms. A solar cell power system, however, needs to extend a large area toward the sun due to its low conversion efficiency. Current production type silicon solar cells have initial (i.e., unirradiated) efficiencies of between 10 and 13 percent, but a further improvement of efficiency in the future seems to be to some little extent, taking into consideration that the theoretical 1y possible efficiency of them is now estimated to be as high as 22 percent tl). In the present paper, the compact solar electric power generation system with a heat engine, which has higher conversion efficiency, is discussed as an alternative to a solar cell power system. A power system with a heat engine such as the Stirling engine can attain a conversion efficiency of more than twice that of a solar cell power system. Title: Solar array for SPS Source: Proceedings of the Second ISAS Space Energy Symposium, Institute of Space & Astronautical Science, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan, Dec. 13-14, 1982. (Paper No. I 1-8) Authors: Ushirokawa, Akio; (Institute of Space and Astronautical Science) and Suzuki, Akio; Hirano, Taizo; (SHARP Corporation) Keywords: prototype systems, solar cells, structure and design Abstract: The design of the solar array for 10 MW SPS main bus supply needs the consideration of the interface to related systems, such as light-weight frames supporting solar array, deploying mechanism, transmission antenna, power control unit and so on. In this paper, we will propose SPS power supply to be ATTACHMENT : constructed with 50 units of the flexible solar sub-array, which have power output of 200 KW each, and mention the items of the future investigation including their interests. Title: Structural design of the 2-D deployable solar cell array Source: Proceedings of the Second ISAS Space Energy Symposium, Institute of Space & Astronautical Science, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan Authors: Miura, Koryo; Ushirokawa, Akio; Natori, Michihiro; Sakamaki, Masamori; (Institute of Space and Astronautical Science) and Furuya. Hiroshi; Tabata, Masaki; Masuda, Yoshio; (Graduate Students, University of Tokyo) Keywords: solar cells, structure and design, fabrication technology Abstract: A fundamental structural design of a new solar cell array in space which consists of a two-dimensional1y deployable solar cell blanket and an extendable rim is presented. External loads are estimated for the typical design of this array whose area is 1000 m(m) for 200KW power generation, and the ATTACHMENT : results of the primary structural calculations are presented. Title: Microscopic studies of radiation degradation of GaAlAs/GaAs solar cells Source: Proceedings of the Second ISAS Space Energy Symposium, Institute of Space & Astronautical Science, 4-6-1 Komaba, Meguro-ku, Tokyo 153, Japan, Dec. 13-14, 1982. (Paper No. I I 1-6) Authors: Sugawara, Kazushi; Shimizu, Masafumi; Mizuki, Toshio; Miyago, Makoto; Hisamatsu, Tadashi ; Otani , Noboru; Yamaguchi , Toshiyuki; Suzuki , Akio; (SHARP Corporat i on > Keywords: solar cells, environmental effects Abstract: Microscopic mechanism of radiation degradation due to electron irradiation has been investigated for GaAlAs/GaAs solar cells. Annealing study reveals that the radiation degradation is due mainly, to Ga displacement. Crystal orientation dependence of radiation degradation is also studied ATTACHMENT : theoretically and experimenta 11y for GaAlAs/GaAs solar cells fabricated using (100) and (110) GaAs substrates. Based on the microscopic analysis, equivalent 1 MeV electron fluence is also evaluated for GaAlAs/GaAs solar cell in synchronous orbit. Title: Japan Space Energetics and Environment Laboratory (JSEEL) Source: Proceedings of the Second ISAS Space Energy Symposium, Institute of
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