Integrated solar upper stage (ISUS) space demonstration design

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Spaceborne And Space Research Instruments, Apparatus, And Components, Thermionic Conversion, Energy Storage Systems, Including Capacitor Banks, Solar Collectors And Concentrators, Other Topics In Electronics, Radiowave And Microwave Technology, And Direct Energy Conversion And Storage, Artificial Earth Satellites

Scientific paper

High temperature solar thermal propulsion/power systems will enable the placement of higher power satellite systems launched from smaller, less expensive launch vehicles. The on-going Integrated Solar Upper Stage (ISUS) Program sponsored by Phillips Laboratory is one such solar thermal system. A system test of an engine ground test configuration of ISUS is planned for Spring, 1997. The next step in the development of the ISUS system will be a flight demonstration mission. This paper details the conceptual designs for two potential ISUS space demonstration configurations. These designs were developed with a design-to-cost philosophy for a LEO (low Earth orbit) to GEO (geosynchronous equatorial orbit) and LEO to HEEO (highly elliptical Earth orbit) flight demonstration missions. Design considerations included packaging within the selected launch vehicle fairings (Pegasus XL and SSLV Taurus), system performance, propellant selection (H2, CH4, or NH3), and 100-150 watts of power production using thermionic diodes.

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