Irregular and non-symmetrical cavities for high-harmonic THz gyrotrons

To ensure high selectivity of excitation of the operating high-cyclotron-harmonic waves in gyrotrons, as well as to provide an increase in the efficiency of high-harmonic gyrotrons by decreasing Ohmic heating, we propose using resonators of special shapes. In this work, we describe axially-symmetrical cavities with one or more axial grooves with mode selective properties, as well as quasi-axially-symmetrical cavities with small azimuthal irregularities. The use of cavities of these types can be the way of achieving a stable single-mode gyrotron operation at frequencies of about 1 THz with a sufficiently high (several kW) output radiation power level.

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