Abstract
We describe two ways of the use in high-harmonic gyrotrons of quasi-regular cavities with short phase correctors. The first one is a significant improvement of the selectivity of the second-harmonic gyrotrons due to the suppression of parasitic near-cutoff fundamental-harmonic waves. The second approach is aimed to solve a typical problem of weakly-relativistic high-harmonics gyrotrons, namely, the use of long cavities ensuring extremely high diffraction Q-factors and a great share of Ohmic losses. We propose a quasi-regular cavity with periodic phase correctors, where a far-from-cutoff axial mode with a decreased diffraction Q-factor is excited in a gyrotron-like regime.
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