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(A) The electromagnetic actuator comprises two coils (5000 turns and diameter of wire of = 1.0 mm) with two cores to increase the magnetic field density (cobalt–iron alloy VACOFLUX 50, VACUUMSCHMELZE, German); the cores are 19.5 cm in length and 6 cm in diameter. Two power supplies (AMETEK SGA 600/17, 10 kW) were utilized to generate currents of up to 6 A (gradient field strength of 2.8 T/m) in the experiments. (B) Schematic of the system.
