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Micro Electric Space Propulsion (MEP)

The goal of the Micro Electric Space Propulsion program is to fundamentally change how we operate in space by enabling autonomous retaskable highly-maneuverable small satellites. The program will accomplish this by demonstrating a new Micro-Electro Mechanical Systems (MEMS) based colloid and ion thrusters. Through miniaturization, MEMS based thrusters will achieve approximately 2x the electrical efficiency of current thrusters. These thrusters will then be combined in very large arrays to achieve high-thrust thrusters for spacecraft ranging from 1 kg to 1000+ kg.

Through miniaturization, MEMS based thrusters will achieve approximately 2x the electrical efficiency of current thrusters. As important as electrical efficiency, the MEP thrusters will also have the ability to change their fuel efficiency (Specific Impulse) on-the-fly from 500s - 10,000 s Isp. Though high fuel efficiency is typically preferable, it comes at the expense of thrust, and thus maneuver speed. By being able to change specific impulse on-the-fly from nearly that of chemical propulsion (~300 s), to over 10,000 s, MEP will allow satellite operators to achieve optimal thrust levels and fuel efficiencies for each maneuver, thus preserving fuel and extending mission life.

Phase I, which completed in 2005, demonstrated ion emission from microscale thruster components. Phase IB, scheduled to complete in 2007, will demonstrate a 1 W thruster element. Phase II, scheduled to complete in 2008, will demonstrate a 100W thruster system. Phase III, scheduled to complete in 2009, will demonstrate a 1kW thruster system. The primary contractors on this program are SRI International and Alameda Applied Sciences Corporation. This program is scheduled to complete in 2009.