Effects of the sever on two-stage gyro-TWT amplifiers

The effects of the sever on two-stage gyro-TWT amplifiers were characterized by a self-consistent slow time scale model. Utilization of a sever was demonstrated to be capable of inducing additional launching losses as well as ballistic bunching effects. In addition, some electrons could bunch on an electron phase equal to 3π/2 at the beginning of the second stage as a result of a large and sharp change of the wave’s phase if the modulation of the electron beam in the first stage was strong. Calculated results further indicated that the performance was more sensitive to the position of sever than the length of the sever. Asymmetric interaction structures with the first stage being shorter than the second stage demonstrated higher saturated powers and wider bandwidths along with exhibiting more resistance to the velocity spread of the electron beam.