Modification of High-Voltage Pulse Waveform by the Spiral and Core-Transformer Ferrite-Filled Lines

The testing results of high-voltage transformer and spiral ferrite-filled lines are presented. The devices convert the envelopes of a bell-shape incident nanosecond pulses with amplitude of about -150 kV. The spiral lines sharpen the front to hundreds of picoseconds, shorten the pulse duration or form an extended continuous pedestal-shape prepulse. The transforming line sharpened a pulse tailing edge from 2 to 1 ns and changed its polarity.