Abstract
A pulse modulator, previously described at the 1995 PAC meeting, has been reconfigured to improve the pulse shape at a slightly lower beam energy, but with a higher current (500 kV, 1kA). The device has been run at rated voltage and current into a resistive load for pulse durations in excess of 250 ns and at /spl sim/0.1 Hz repetition rate. The modulator, which is designed for use in our high power microwave research program, has been coupled to an electron gun which uses a ferroelectric cathode and has been operated in this mode producing a 500 kV, 200 A electron beam. We report in this paper on the revised design and performance of the modulator and present preliminary data on the electron gun design and characteristics.
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