CONCLUSION The solar power satellite is a typical project of macroengineering as it involves various technical and engineering as well as social and economical problems, which include many options and choices requiring decisions. Considering the macrosize of the project, concept of macrophasing has been introduced. It features each phase with the central facility which serves as a main experiment facility and also demonstrates milestone achievement of important problems of the SPS project. This may not be a technical shortcut but emphasizes importance of familiarization with the project by more people who can participate in this future project with each interest, and may serve as a process to raise proper assessments both international and domestic. According to this phasing, the present space program effort being carried out with sounding rockets and satellites will be categorized as prephase activities. In the first phase is featured by the space station which is assumed to be constructed in a decade and to offer a chance to develop technologies for the SPS and to conduct related engineering tests. If enough experience and practice are gained, a dedicated space station will be required for constructing larger models of the SPS which can be used for study of environmental problems in the second phase. Several preliminary concepts featuring these phases have been presented for the purpose to clarify the idea of early approaches to the SPS related experiments and possible transient models from experiment stage to operational stage. The third and last phase of the SPS development will emphasize economical evaluation of the system through construction and operation. At present, any experimental approach will be a meaningful step toward initiation of a larger scale SPS experiment. It would be most important to coordinate these step-by-step activities to aim at a common goal. REFERENCES 1. P.E. Glaser, Macro-Engineering and the Infrastructure of Tomorrow, pp. 177-207, Westview Press, Colorado, 1978. 2. H. Matsumoto, N. Kaya, I. Kimura, S. Miyatake, M. Nagatomo, and T. Obayashi, MINIX Project toward the Solar Power Satellite, Proceedings of the First ISAS Space Energy Symposium, Institute of Space and Astronautical Science (ISAS), pp. 69-76, Tokyo, 1982. 3. T. Obayashi, N. Kawashima, K. Kuriki, M. Nagatomo, I. Kudo, K. Ninomiya, M. Ejiri, and S. Sasaki, Space Experiments with Particle Accelerators (SEPAC): SEPAC Experiment Programs for the First Spacelab Mission, Proceedings of the Twelfth International Symposium on Space Technology and Science, pp. 911-917, 1977. 4. K. Kuriki, Environment Modification by Plasma Propulsion System, Proceedings of the First ISAS Space Energy Symposium, pp. 63-68, ISAS, Tokyo, 1982. 5. H. Saito, Private Communication. Mitsubishi Electric Corporation Central Research Laboratory, Amagasaki, 1982. 6. H. Matsumoto, Private Communication, University of Kyoto, Kyoto, 1982. 7. K. Kuriki, Private Communication, ISAS, Tokyo, 1982. 8. M. Nagatomo, H. Matsuo, and K. Uesugi, Safety Design of Space Station Against Collision Hazards with Artificial Orbiting Bodies, Proceedings of the Fifth International Space Rescue Symposium, pp. 245-264, International Academy of Astronautics, Paris, 1973. 9. M. Nagatomo, On Determination of Scale Factor of Experimental Solar Power Satellite, Proceedings of the First ISAS Space Energy Symposium, p. 62, ISAS, 1982. 10. Y. Hamakawa, A Very Wide Area Thin Film Solar Cell Fabricated by Molecular Beam Grapho- Epitaxy in Space, IAF Paper 80-G-309. 1980. 11. National Aeronautics and Space Administration, Guidelines for Project Planning, NHB 7121.4, 1972.
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