experiments in orbit. Also, since the primary objective is to establish a bus technology for future space vehicles, it is vital to advance research certainly and efficiently. For this, advancing R&D in stages is desirable. The required steps are 1) conducting verification tests (several kilowatts) of basic technologies with JEM, then 2) conducting system verification tests (10 kW) utilizing the engineering test satellite opportunity. System studies are based on the assumptions above. Figs. 1 and 2 illustrate images of the configurations of the engineering test satellite (ETS). Central Research Institute of Electric Power Industry [CRIEPI] The Central Research Institute of Electric Power Industry, founded by the Japanese power utilities, carries out research activities in the SPS research program on the following schedule.
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