Design of a 80 kW, 700 MHz bandwidth W-band gyroklystron amplifier circuit

Summary form only given, as follows. A four cavity TE/sub 01/ mode gyroklystron amplifier has been designed as the driver for a W-band radar currently under development at NRL. The performance goals for the amplifier are 80-100 kW peak output power, 10 kW average power, and 600 MHz -3 dB bandwidth. A time dependent version of the non-linear code MAGYKL was developed to design the interaction circuit. The stagger tuning and cavity Qs were optimized through extensive theoretical studies to determine the tradeoffs between peak output power and bandwidth. A mechanical tolerance study was performed. The stability of the cavities and cutoff drift regions was also examined. The resulting circuit is predicted to achieve 80 kW peak output power and 20% efficiency with a 65 kV, 6 A electron beam with a velocity ratio of 1.5 and a perpendicular RMS velocity spread of 4.5%. Simulations indicate that the -3 dB bandwidth is 700 MHz. Details of the circuit and design studies are presented.