The design of a TE021 mode high power Ka-band gyroklystron

The design study of a 34 GHz, 708 kW gyroklystron amplifier is presented. To enhance the power, the device has four cavities and operates in the TE₀₂ mode. Stagger tuning was employed to broadband the device. The nonlinear theory is used to calculate the optimized magnetic field. The sizes of the cavities were optimized to minimize the TE₀₁₁ mode and to suppress parasitic oscillations. The design yields a 34 GHz, 708 kW peak power, 47 dB saturated gain, 50.6% electron efficiency, and a -3 dB bandwidth of over 510 MHz (1.5%) with a 70 kV, 20 A electron beam by PIC simulation.