A multi-cavity klystron with double-tuned output circuit

An improved bandwidth has been obtained from a six-cavity pulsed S-band klystron amplifier by the use of a double-tuned output circuit. The output power was greater than 2.5 MW over a 6.3% bandwidth when the drive power was optimized at each wavelength, and greater than 2 MW over a 5.5% bandwidth with a constant drive of 25 watts. The power in the electron beam was 10 MW.