Solar AMTEC systems are modular, inherently radiation hard, low mass, and capable of high thermal-to-electric conversion efficiency without moving parts at temperatures compatable with current solar receiver technology. Future USAF missions, such as Space Based Radar and Space Based Laser, require high power, output (50-100 kWe) and high efficiency from solar AMTEC systems. The Phase I program has generated a concept design for a 500 We solar-heated radial AMTEC cell. The cells will employ thermal energy storage (TES) media to provide continuous power through eclipse periods at LEO, MEO, and GEO altitudes. TES materials compatability was also investigated in Phase I. Phase I also investigated novel approaches to creating isothermal conditions on AMTEC electrodes which will be validated both analytically and experimentally for the large beta"-alumina solid electrolyte tubes appropriate for high power applications. The proposed Phase II program will focus on completion and demonstration of a specific 500 We design tailored to high power USAF missions. Cell power densities approaching 150 W/kg are expected in systems with specific power of 12 - 14 W/kg, including all subsystems. A TES/radial cell integration study for future system ground testing relevant to high power missions will be performed.
Benefits: If successful, this program will develop 500 - 1,000 Watt AMTEC modules that can be assembled into solar driven, power systems capable of enabling satellite operations requiring electric power delivery at 50 - 100 kWe, at MEO and GEO altitudes. In addition to high power AF missions, a wide variety of commercial satellite and terrestrial applications can also be supported. The program is designed to produce demonstration hardware at the 500 We level
