Development of an X-band 650-kW Peak Output Power Klystron with a 100-MHz Instantaneous Bandwidth

This paper presents the design considerations, the simulation, and the test results for an X-band klystron design with a 600-kW peak output power level, which was developed in 2018. Five klystrons were built and tested. Over 650-kW-peak-output-power with a 100-MHz instantaneous bandwidth was measured at a 0.5% RF duty cycle (50-μs RF pulse-width and a 100-Hz repetition rate). The measured electron beam-to-RF conversion efficiency is 30%.