Design of miniature square-pulsed magnetic field generator

A double-coil load of the miniature square-pulsed magnetic field generator was proposed, and an evenly-distributed magnetic field was obtained in the load area. Six-stage pulse-forming network(PFN) with 2 single-stage characteristic impedance was used as the primary energy storage and pulse-forming element, and it could output a square drive current pulse on the impedance-matched load. Furthermore, a field-distorted gas spark switch was developed as the main switch, and it could effectively reduce the action-delay time and its dispersion of the generator. Experimental results show that the peak value of the magnetic field at the center of the load area is 0.04 T, the flat-top time is about 3 s, the top-droop ratio is less than 5%, the risetime (10%-90% peak value of magnetic induction) is less than 0.5 s, and the action-delay-time dispersion of the generator is less than 10 ns (standard deviation).