power modules can be launched in a single Shuttle flight. The receiver/PCU/radiator combination is completely assembled and charged with gas and cooling fluid on earth before launch to orbit. Therefore, there will be no need to make on-orbit gas or fluid connections. The concentrator panels and facets will be pre-aligned and the panels, with facets installed, stowed in the Shuttle orbiter bay before launch. The SD module is expected to have a mass of about 7440 kg (16 360 lb) complete with seven assemblies and six bays of truss. For growth in power capability, additional sets of functional SD hardware will be added to Freedom's manned base. Each set will increase Freedom's power capability by 25 kW. These hardware sets may or may not include truss bays, depending on the power increment added. SD equipment sets are designed to be located on opposite faces of the outermost truss bay to provide 50 kW on each six-bay truss set. Each set of SD functional hardware will be complete with beta gimbal, interface structure, and all hardware outboard of the beta gimbal. Continuation of SD module operation and provision of power for the requird 30 years will be by periodic maintenance and replacement of assemblies or parts as orbital replacement units. Concentrator. The concentrator is the visually dominant assembly of the SD power module. It is an erectable structure designed to be assembled by astronauts on orbit. As shown in Fig. 4, it is an offset parabolic reflector system consisting of a reflective surface, support structure and a gimballed fine pointing mechanism. The reflective surface, shown in Figs. 5 and 6, is an assembly of 19 hexagonal panels each containing
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