Abstract
This paper reviews the status of and requirements on solar electric and nuclear electric power supplies for primary electric propulsion missions. The power supply requirements of power level, specific mass (kg/kWe), and lifetime are defined as a function of the mission and electric propulsion system characteristics for planetary missions. The technological status of silicon and gallium-arsenide solar arrays is discussed. Nuclear reactors and thermoelectric, thermionic, Brayton, and Rankine conversion technologies are reviewed, as well as recent nuclear power system design concepts and program activity. Technology projections for power supplies applicable to primary electric propulsion missions are included.
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