Speaker
Description
A new-type high-voltage pulse generator by means of a method of frequency-segmented power amplification was proposed and developed. A seed pulse is divided into several lines that have bandpass filters, variable delay lines, variable power attenuators, and main rf amplifiers to correct the frequency-dependent group delays and gain of the amplifier circuit and to perform fine-tuning of the pulse structure. The high-voltage pulse was finally obtained by combining them with the rf power combiners. We introduced it for the new beam chopper of low-emittance thermionic electron gun at the X-ray free-electron laser SACLA. Flat and stable pulses with a 2-ns width, a 0.8-kV height in 50-ohm impedance, and peak-to-peak flattop variation of 0.6% were successfully generated, and the system has already been in operation at the SACLA injector. It can also generate an electron beam with multi-bunch structure. Recently, we succeeded in generating double-bunch XFEL lights with a 10-keV photon energy, 0.5-mJ pulse energies each, and 8.4-ns bunch separation. This type of pulse generator will play important roles not only in particle accelerators but also in other fields such as optical lasers.
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