Dawn The Trip of One Xenon Atom Through an Ion Engine Simplified Graphic.

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Dawn The Trip of One Xenon Atom Through an Ion Engine Simplified Graphic

Dawn As a Xenon atom moves through an Ion Engine...it is 1. Ionized2. Attracted3. Accelerated4. Neutralized

Dawn Why Xenon? it is an inert gas it has a low first ionization energy its charge-to-mass ratio can provide exhaust speeds of approximately 10 6 km/h it is not radioactive

DawnDawn Relative Charge Number Line Negative charge strengths Positive charge strengths

DawnDawn Relative Charges in Ion Engine Engine walls< Xenon ion plasma< First electrode grid < Second electrode grid

Dawn Ionization Collision forms a xenon ion and two free electrons Electron collides with xenon atom Enlargement of action area

Dawn Attraction to Positive Grid Enlargement of action area 1000 micrometers (  m )

Dawn Enlargement of action area Acceleration Xe+ Xe Acceleration 35,000 m/s   1/50th of a pound thrust

Dawn Enlargement of action area Neutralization

Dawn Xenon Ions Provide Thrust m i v i   m e v e = 750-kg Dawn spacecraft∆v = m/s