Super-power generator of mm-waves driven by microsecond sheet beam

Results of experimental investigations of a powerful mm-band FEM-oscillator driven by a sheet electron beam are presented. For mode selection, a planar geometry Bragg resonator was used. Microsecond pulses at a wavelength of 4 mm and power of 200 MW corresponding to record energy per pulse of 200 J were generated. The possibility to increase the energy content of the millimetre wave pulse up to tens kilojoules is discussed.