Using self-consistent field theory and PIC simulation, the interaction of electron flow with HF fields in a four-cavity Gyroklystron with TE 021 -mode has been analyzed. Self-consistent field theory includes both linear theory and nonlinear theory. Optimized parameters and their corresponding efficiency, gain and bandwidth of the optimized Gyroklystron have been found. Numerical investigation using PIC simulation is also given. Parameters of the cavities which are operating in TE 021 mode are optimized to minimize TE 011 mode and to suppress parasitic self-oscillations. The results of theory are in good qualitative agreement with PIC simulation.

Design techniques and experimental results are presented on a Ku-band TE 11 mode gyro-traveling wave tube. The hot test of this amplifier gives more than 153-kW output power, 2.3-GHz bandwidth (14%), 41-dB saturated gain, and 20% efficiency driven by a 63 kV, 12-A electron beam with a pitch angle (v t v z ) of 1.2, and velocity spread of 5%. A linear polarized TE 11 mode input coupler is used to introduce the input power. The stability of the amplifier from oscillation, including both the operating TE 11 mode and the backward wave TE 21 mode, has been investigated with linear codes, nonlinear selfconsistent theory, and 3-D PIC CHIPIC simulation. To suppress the potential gyro-backward wave oscillator interactions, the high frequency circuit is loaded with lossy ceramic rings. The lossy structure is optimized by nonlinear theory and 3-D PIC simulation. A low velocity spread magnetron injection gun is designed with a new structure.

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