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The alkali metal thermal to electric converter (AMTEC) technology has grown tremendously over the past 10 years. Innovations such as wick pumping, remote condensing and multi-tube cells have advanced the technology substantially. New innovations have been identified that will further advance the technology. The internal selfheat pipe (ISHP), for example, is predicted to increase the efficiency by a full 3 points. Proof-of-principle tests have been completed, and prototype testing is about to begin. This paper will present the design concept and available test data for this new AMTEC innovation.

An Advanced Radioisotope Power System (ARPS) in the 150 watt class is currently under development for space applications. The ARPS is a potential power source for potential NASA missions to Europa in 2003 and Pluto/Kuiper in 2004. The ARPS system, which has been described in recent literature (Hendricks, 1997), will utilize a multi-tube Alkali Metal Thermal to Electric Converter (AMTEC) cell design. Designated EPX-1, the cell is designed to survive ground handling and launch stresses and provide reliable power for the duration of the missions. The EPX-1 AMTEC cell is based on the PX series of demonstration cells (Borkowski, 1997, and Sievers, 1998). The planned operating temperatures and life requirements for these missions have made an all refractory metal design a requirement. Several other design enhancements have been implemented to meet specific mission requirements and improve predicted cell reliability.