Fig. 3. A concept of the power unit of a space station system transmitting the microwave power to the work unit. Study 2 This is a concept of experiments using a similar facility as depicted by Fig. 4 (5). The power module provided with a gimballed antenna, the space station and the instrumentation teleoperator flying between the two major modules. The teleoperator can move to take any position relative to the power unit. This provides microwave transmission study with any arrangement of transmitting and receiving power stations which is difficult to be realized on the Earth especially in Japan. This experiment intends to verify capability of transmission of power as high as 100 kW by microwave. Study 3 The unique power receiving facility shown in Fig. 5 is studied by the MINIX research group (6). The receiving station has a balloon which is as large as 100 m in diameter in front of the receiving antenna, filled with low pressure air similar to the condition of the lower ionosphere. The contained gas will be heated by the microwave transmitted from the main station under the same condition as an operational SPS microwave from a viewpoint of heating duration and power density. The diagnostic sensors are suspended in the balloon to detect the heating and plasma wave excitation effects. This MINIX combined with the microwave energy transmission and reception will be a subscale experiment of the SPS project and provide a clue for microwave technology, antenna technology, and environmental effect issues. Study 4 (7) This is a preliminary study on future space experiments of advanced propulsion and space power, which is considered as an extension of efforts of the SEPAC. The high electrical power generated on the space station will make it possible for MPD
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