[1] Technology development relevant to energy exploitation in space, e.g., Solar Power Satellite, [2] Environment study associated with space energetics. Individual experiments supposed to be included in the SEEL are summarized as follows: [1] Space Plasma Experiments (SPEX): Beam and plasma interaction with ionospheric environment, [2] Advanced Propulsion Test (APT): Verification test of MPD arcjet and ION engine, [3] Space Radar (SRADAR): Establish space radar surveillance system, [4] Microwave Energy Transmission Test (METT): Beam control, transmission efficiency and impact on atmosphere, [5] Space Laser (SLASER): Solar pumped laser and laser propulsion experiments, [6] 2D Solar Array Deployment (2D): Solar cell and various associated technologies to be developed. The requirements raised from these experiments are listed in Table 2. The requirements for orbit, altitude, pointing, communication and tracking will be reviewed in more details. The rationale by which the SEEL missions are grouped together is not only their contribution to the energetics technology development, but also that they have commonality in utilizing the Space Station facilities. Commonality of Facilities and Communication Link • Main facility: An unmanned bus platform, • Associate facility: The core space station as communication center and subsatellite teleoperator. High Power Beam Ejection: Electron and Plasma • Microwave and laser beams. Interactive Experiments • Excitation/detection type experiments — SPEX, APT and METT, • Transmission/reception type experiments — SRADAR, METT and SLASER. Formation Flight • Space station elements, • Subsatellite for interactive experiments. Considering these common features of experiments, an integrated SEEL complex should consist of the unmanned bus platform, subsatellites and teleoperator. The unmanned bus platform is the main facility to accommodate noisy high electrical power equipments. Typical configurations of the bus platform and teleoperator are shown in Fig. 3. Configuration of subsatellites are mission-dependent. With these
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