Large ferrite core tests using a 50-ns pulse

During an investigation of the pulsed properties of large ferrite cores, a pulser capable of 300 kV maximum peak voltage with 50-ns pulse width and 7 ns risetime was built. various ferrite cores with 50 cm O.D., 20 cm I.D., and 2.5 cm thick were tested. The oscillograms of the voltage and excitation current and some typical plots of ΔB vs. ΔH are shown. The pulsed properties of a flux swing ΔB ≥ 0.5 T and an incremental permeability μΔ ≥ 400 with a peak self-reset equivalent to 4 Oe have been obtained.