Abstract

An unexpected abrupt increase of the output power at magnetic field values corresponding to the excitation of high-order axial modes (HOAM) was observed experimentally and is explained theoretically through an after-cavity interaction of the bunched electron beam with the next radial mode. The calculations showed that under certain conditions this effect can be either useful for a power increase at the HOAM operation of the frequency-tunable gyrotron or harmful for high cyclotron harmonic operation due to an expansion of the zone of fundamental cyclotron resonance mode excitation.

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