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In this paper, an S band, 300 MHz bandwidth, and 20 kW average power klystron was developed in the Aerospace Information Research Institute, Chinese Academy of Sciences. The klystron operates at 72 kV beam voltage and 41 A beam current with peak powers of over 850 kW and efficiency of over 30% at a 2.47% RF duty cycle. The results, including simulations, design, technologies, and performances of the klystron, are presented. Some problems such as gain dip, high order mode oscillation, output window cracking, and startup time were also discussed.

S-BAND KLYSTRON WITH 300 MHZ BANDWIDTH AT 850 KW PEAK POWER AND 20 KW AVERAGE POWER