Improvement for an S-Band Broadband Klystron

This article presents some important improvements of the
${S}$
-band broadband klystron development. In the course of hot test of an
${S}$
-band 800-kW peak power klystron with 250-MHz instantaneous bandwidth (the equal-driving input power), the power dip and RF breakdown phenomenon has described. Through simulation analysis and experimental investigation, the technological problems have been solved. The retrofitted klystron has been conducted and tested, the fluctuation of output power is less than 0.5 dB within 250-MHz bandwidth at constant drive power, and the RF breakdown problem of the output system is overcome. The improvement of the waveform of the klystron has also been made.