Diagram of an Ion Propulsion System Engine Poster

The ion propulsion system (IPS), provided by NSTAR (NASA SEP Technology Application Readiness), uses a hollow cathode to produce electrons to collisionally ionise xenon. The Xe+ is electrostatically accelerated through a potential of up to 1280 V and emitted from the 30-cm thruster through a molybdenum grid. A separate electron beam is emitted to produce a neutral plasma beam. The power processing unit (PPU) of the IPS can accept as much as 2.5 kW, corresponding to a peak thruster operating power of 2.3 kW and a thrust of 92 mN. Throttling is achieved by balancing thruster and Xe feed system parameters at lower power levels, and at the lowest thruster power, 500 W, the thrust is 20 mN. The specific impulse decreases from 3100 s at high power to 1900 s at the minimum throttle level. Image reproduction rights can be found in the link near the bottom of this description. Sign up to Mr. Rebates for FREE and save 12% on any zazzle order in addition to a $5.00 sign up bonus All Rights Reserved; without: prejudice, recourse or notice (U.C.C. 1-308) Image Reproduction Rights: http://commons.wikimedia.org/wiki/File:Ion_engine.svg "ion propulsion" "ion propulsion system" "ion engine" "ion propulsion engine" ips engine "space engine" "space shuttle engine" "outer space" "ionised xenon" "space exploration" ds1 "ds1 ion engine" "ds1 ion propulsion" "ds1 ion propulsion engine"