PPPL-4603
Fast Camera Imaging of Hall Thruster Ignition
Authors: C.L. Ellison, Y. Raitses and N.J. Fisch
Abstract: Hall thrusters provide efficient space propulsion by electrostatic acceleration of ions. Rotating electron clouds in the
thruster overcome the space charge limitations of other methods. Images of the thruster startup, taken with a fast camera, reveal a
bright ionization period which settles into steady state operation over 50 μs. The cathode introduces azimuthal asymmetry, which
persists for about 30 μs into the ignition. Plasma thrusters are used on satellites for repositioning, orbit correction and drag compensation. The
advantage of plasma thrusters over conventional chemical thrusters is that the exhaust energies are not limited by chemical energy to about an electron volt. For xenon Hall
thrusters, the ion exhaust velocity can be 15-20 km/s, compared to 5 km/s for a typical chemical thruster.
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Submitted to: IEEE Transactions on Plasma Science - Images in Plasma Science (December 2010)
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