Variable Definition Nominal Value Time, measured from year 2000, when nonpower salvageable pieces are removed (years) Cost per kilowatt of power not including delivery costs (it is assumed that the cost of SPS and mission power are equal) ($/kW) Cost per kilogram delivered to GEO from Earth ($/kg) Cost per kilogram of disposing of nonsalvageable mass of the demonstration satellite ($/kg) Mass of usable demonstration satellite facilities (kg) Cost of usable demonstration satellite facilities ($) Cumulative average learning rate for cost of other salvagaeble pieces of the demonstration satellite (%) Cumulative average learning rate for cost per kilogram delivered to GEO from Earth (%) Cumulative average learning rate for cost per kilowatt of power not including delivery costs (%) Cumulative average learning rate for cost per kilogram for transporting power subsystem from the demonstration satellite orbit to mission orbit (%) Cumulative average learning rate for achievable power density of power system (%) Cumulative average learning rate for cost per kilowatt for segmenting the demonstration satellite into power modules (%) Cumulative average learning rate for cost per kilowatt for installing SPS segmented power module on mission spacecraft (%)
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