Electric Propulsion: A Key Enabling Technology for Planetary Exploration* A White Paper for the Planetary Science and Astrobiology Decadal Survey 2023-2032 Jay Polk, Jet Propulsion Laboratory, California Institute of Technology
[email protected], 818-281-1094 George Soulas, NASA Glenn Research Center
[email protected], 216-977-7419 Andy Hoskins, Aerojet Rocketdyne
[email protected], 425-945-6362 *The information presented in this white paper about future mission concepts and power systems is pre- decisional and is provided for planning and discussion purpose only. A portion of this work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). 1 Abstract. Electric propulsion is now widely accepted by industry, with over 900 operational spacecraft using electric thrusters as of June 30, 2020. Electric propulsion provides dramatic reductions in propellant mass which can enable many demanding mission concepts to meet their scientific and operational goals. It has already proven to be a critical enabling technology on science missions such as Dawn, Hayabusa I and II, and BepiColombo and is the key to making missions in development like Psyche and a potential Mars Sample Return possible. These examples show that electric propulsion can enable the use of smaller launch vehicles, provide mass margins that make missions much more robust, yield much greater flexibility in launch dates, reduce the number of critical events, and, in some cases, reduce trip times by eliminating the need for gravity assists. Electric propulsion systems developed by industry for commercial spacecraft and NASA- developed technologies for higher power and specific impulse support current mission applications, but ensuring that electric propulsion can meet the demands of future missions requires continued investment by NASA.