In spacecraft propulsion, a Hall-effect thruster (HET) is a type of ion thruster in which the propellant is accelerated by an electric field. (Linnell and Gallimore 2006)
Linnell, Jesse A., and Alec D. Gallimore. 2006. "Krypton Performance Optimization In High-Voltage Hall Thrusters". Journal Of Propulsion And Power 22 (4): 921-925. doi:10.2514/1.18531.