The multifrequency radiation in a pulsed gyro-resonance backward-wave oscillator (gyro-BWO) of the Ka-band based on a waveguide with helical corrugation are obtained. The radiation power achieved 30-35 kW with a pulse duration of about 120 μs and a repetition rate of up to 10 Hz. Due to the change in the magnetostatic field in the interaction region and the pitch factor of the particles, the center oscillation frequency and the distance between the main spectral lines are tuned in the 32–35.5 GHz and in the 360–550 MHz ranges, correspondingly.
Using the averaged equations supplemented with 3D particle-in-cells simulation methods, we study the frequency multiplication regime in high-current relativistic gyrotron. We show that the ratio between the output power of the higher (fifth or sixth) harmonics and that on the fundamenta cyclotron resonance may be of about 0.1-0.3%. Accordingly, the nonlinear transformation coefficient as several orders higher than the values achievable in gyrotrons with weakly relativistic electron beams.
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