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. .. Olga1glm@googlemail.com Relativistic diffractional generators (RDG) are promising sources for generation of longpulsed high power coherent microwave radiation in the centimetre and millimetre wavelengths range. The numerical studies of self-consistent problem of multiwave interaction between tubular electron beam and fields of super-dimensional axisymmetric periodical slow-wave structures (SWS) of corrugated waveguide in the frequency range of 2-type oscillations are carried out in present work. Starting conditions of generation in relativistic diffractional generator and features of an establishment of steady generation for various values of beam currents are investigated numerically by means of matrix multiwave method.

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