Possibility of MW-Level Second-Harmonic Generation in a Gyrotron Locked by an External Signal

We theoretically study the possibility of high-power (MW-level) generation in second-harmonic gyrotrons based on the frequency-locking by a weak (several percent of the power) external monochromatic signal. Such a signal can suppress the generation of the parasitic fundamental harmonic during the start-up process. Within the frame of multimode self-consistent non-stationary model, we demonstrate the applicability of the described approach to provide 0.65 MW output radiation in a 230 GHz 2
^nd
-harmonic gyrotron with TE
31,8
operating mode.