Hall plasma thruster

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Hall plasma thruster [′hȯl ¦plaz·mə ‚thrəst·ər]

(aerospace engineering)

A type of electromagnetic propulsion system in which electrons drawn through an annular discharge chamber feel the effect of a radial magnetic field between the central and outside pole pieces bounding the discharge region, and thereby follow azimuthal cyclotron (Hall-effect) trajectories that increase the probability that they will have ionizing collisions with propellant atoms; the positive ions produced in these collisions are accelerated downstream, thereby producing thrust.

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