Abstract

A time-domain theory of a low-Q gyrotron operating under the influence of the frequency-dependent reflections of the output radiation has been developed. The theory is based on the description of the wave propagation by a parabolic equation taking into account the reflected signal by proper modification of the boundary conditions. The developed model was applied to simulations of frequency stabilization in gyrotrons due to partial reflections of the output radiation from a resonant remote load. For the case of low-Q powerful gyrotrons, the reflected signal can significantly influence the axial field profile inside the interaction space and, correspondingly, the value of the electron orbital efficiency.

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