George Williams, ... Long-Life High Specific Impulse Titanium Ion Optics. While the Dawn spacecraft is visiting the asteroids Vesta and Ceres, NASA Glenn has been developing the next generation of ion thrusters for future missions. NASA's Evolutionary Xenon Thruster (NEXT) Project has developed a 7-kilowatt ion thruster that can provide the capabilities needed in the future. Ion thrusters are therefore able to achieve high specific impulse, reducing the amount of reaction mass required, but increasing the amount of power required compared to chemical rockets. While this system has a lower average specific impulse (1500-3000 s isp) than the gridded ion drives, it has more thrust (a typical drive system used today uses 1.35 kW of power to generate 83 mN of thrust), meaning that it’s very good for either orbital inclination maintenance or reaction control systems on commercial satellites. A variety of other non-rocket propulsion methods, such as ion thrusters, give much higher specific impulse but with much lower thrust; for example the Hall effect thruster on the Smart 1 satellite has a specific impulse of 1640 s (16100 m/s) but a maximum thrust of only 68 millinewtons. bardment ion thruster meeting the general specifications required for prime solar electric propulsion has been de veloped and tested. Our family of ion thrusters provides for a range of diverse space missions with thrust levels from 50 µN through to 205mN. The 2.5 kW module operates at an electrical efficiency of 77%, with a mass utilization of 90% (including the plasma bridge neutralizer) at a specific impulse of 2750 sec. Electrostatic ion thrusters have accelerated ions to speeds reaching 100 km/s. The portfolio comprises a family of three thrusters: 1) RIT μX. The specific impulse ranges from 1900 s at 0.5 kW to 3100 s at 2.3 kW. The nominal thrust level is 27 mlb. While the Dawn spacecraft is visiting the asteroids Vesta and Ceres, NASA Glenn has been developing the next generation of ion thrusters for future missions. Due to the efficient ionization process which allows to ionize up to 60% of the evaporated Indium atoms, the IFM Nano can provide a higher specific impulse than any other ion propulsion … The whole spacecraft, including the ion propulsion thrusters, is powered by a 10 kW (at 1 AU) triple-junction gallium arsenide photovoltaic solar array manufactured by Dutch Space. Specific Impulse, Nominal 220 s Specific Impulse, Range 200 - 223 s Mass Flow Rate, Nominal 0.44 g/s Mass Flow Rate, Range 0.142 - 0.447 g/s Inlet Pressure Range ... Ion Propulsion Propellant Tanks Propulsion Systems.
A specific impulse of 3800 s with thrust efficiency greater than 30% was obtained; the corresponding mass-averaged exhaust velocity exceeded the value by full-potential electrostatic acceleration of singly charged ions.
The efficiency and specific impulse values with krypton range from approxi- More than 100 emitters have been tested and an ongoing lifetime test has demonstrated more than 18.000 hours of firing without degradation of the emitter performance. Glenn is currently developing high-specific-impulse, megawatt-class, hydrogen-fueled MPD thruster technology.
Electric propulsion engines of the types you're interested in, however, make an extreme trade-off of minimal thrust in favor of very high specific impulse. The xenon data (from Reference 7) represent peak efficiencies demonstrated with 30 cm xenon ion technology. Gridded ion thrusters offer very attractive specific impulse, in the range of 1500-4000 seconds, with exhaust velocities up to about 100 km/s for typical designs. They have a specific impulse of 3,100 s and produce a thrust of 90 mN. George Williams, ... Long-Life High Specific Impulse Titanium Ion Optics.
It is linked to the thrust and fuel consumption. The 30-cm ion thruster operates over a 0.5 kW to 2.3 kW input power range providing thrust from 19 mN to 92 mN. Pulsed plasma thrusters are ideal for applications in small spacecraft for attitude control, precision spacecraft control, and low-thrust maneuvers. Application of Ion Thrusters to High-Thrust, High-Specifi c-Impulse Nuclear Electric Missions.
The portfolio comprises a family of three thrusters: 1) RIT μX. Research at Glenn encompasses a combination of systems analysis, numerical modeling, and high-power experiments that investigate pulsed versions of both self-field and applied-field MPD thrusters. Glenn is currently developing high-specific-impulse, megawatt-class, hydrogen-fueled MPD thruster technology. Radio Frequency Ion Thruster Family. Published Online: ... High-Specific Impulse Ion Thruster. More than 100 emitters have been tested and an ongoing lifetime test has demonstrated more than 18.000 hours of firing without degradation of the emitter performance. Published Online: ... High-Specific Impulse Ion Thruster. > The specific impulse defines the efficiency of an engine. They are very fuel efficient, but they don't have anywhere near enough thrust to lift their own weight against Earth's gravity, let alone a useful payload. Radio Frequency Ion Thruster Family.
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