Analyses and/or design studies were conducted for each element of the systems to varying degrees. These studies included several satellite configurations, construction concepts, crew requirements, alternate microwave generator concepts, rotary joint designs, attitude and control concepts, and structural designs. Several program scenarios were developed which defined the number and schedule of space power satellites required to provide varying percentages of the nation's energy needs in the 1995-2025 period. Satellite weights were then coupled with the number and schedules of satellites required to define a range of transportation requirements. These requirements were used to guide the study of various transportation elements and to estimate integrated transportation requirements such as fleet size. Transportation elements for which specific studies were conducted included multi-stage winged and ballistic heavy lift launch vehicles, and of a variety of orbital transfer vehicle thrusters, and personnel launch and transfer vehicle designs. In a similar manner, the satellite and transportation system characteristics, number and schedule were used as a basis to estimate the cost of DDT&E, total program, and mills per kilowatt hour. Preliminary estimates are also provided of natural resource requirements and pollutants emitted from processing and launch operations. Estimates of energy payback are also presented. Figure 1-1 presents the task structure that was used in the study effort. Both Volume I and Volume II are organized according to this task structure.
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