The concept of two-wave relativistic Cherenkov oscillator for the generation of nanosecond microwave pulses at ∼72 GHz central frequency has been applied. A moderately oversized sectioned slow wave structure (average diameter ≈2.5 wavelength) provides the interaction of electrons simultaneously with a slow (or surface) TM01 wave and a fast (or volume) TM02 wave, which govern the microwave energy output. The generation of 85 MW, 1.3-ns long microwave pulses has been demonstrated in a single pulse operation with a pulsed guiding magnetic field of 3.8 T on the base of the desktop high-current accelerator RADAN-303.
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