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A SMART precursor to the new lunar exploration fleet

25 February 2005

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Credits: ESA

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Close-up view of SMART-1's stationary plasma thruster

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Electrons attracted into the discharge chamber collide with xenon atoms from the propellant gas supply, making charged atoms (ions). Current-carrying coils, inside and outside the doughnut-shaped discharge chamber, sustain a magnetic field oriented like the spokes of a wheel. By the Hall effect, ions and electrons swerving in opposite directions in the magnetic field create an electric field. This expels the xenon ions in a propulsive jet. Other emitted electrons then neutralize the xenon, producing the blue jet.

Credits: ESA 2002. Illustration by Medialab.

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Artist's impression of SMART-1

Credits: ESA

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Credits: ESA/Euronews

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