Abstract
We consider gyrotrons with echelette resonators formed by diffraction gratings on the inner surface of a cone with the ribs perpendicular to the cone axis. The Q-factor of the operating cavity mode is controlled by the choice of grating parameters. Selective properties of the resonator are determined by the frequency dependence of the antireflection coefficient. Such resonators have a higher selectivity and more effective coupling with the output waveguide than cylindrical resonators, which allows gyrotron power to be increased. Echelette resonators can be used in gyrotrons at higher cyclotron harmonics owing to their higher selectivity without fear of exciting lower harmonics. Starting currents and efficiency of a gyrotron with an echelette resonator are found. Experimental studies of gyrotrons with echelette resonators confirmed the possibility to rarefy considerably the gyrotron oscillation spectrum.
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