Abstract
Radioisotope power systems are an enabling and essential technology for missions to the outer planets. Previous planetary missions such as Voyagers I and II, Galileo, Ulysses, and Cassini have all relied on Radioisotope Thermoelectric Generators (RTGs). These RTGs, while demonstrating outstanding reliability and extremely long life, have relatively low power conversion efficiency. Advanced power systems now being developed offer the prospect of significant improvement in efficiency with corresponding reduction in the plutonium fuel required. One of the options studied by Lockheed Martin under the Advanced Radioisotope Power System (ARPS) program, under contract from DOE, utilizes Stirling engine/alternators. This power conversion technology has been demonstrated by Stirling Technology Corporation (STC), including operation of 55-watt engines under a Technology Demonstration Converter (TDC) program funded
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