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А diffraction problem of proper radiation of relativistic tubular electron beam modulated on reference frequency on periodic obstacles of axisymmetric slow-wave structure (SWS) was considered in the work. Relativistic electron beam was assumed to be focused by magnetic field of finite value, so the transversal interaction in SWS was governed by gyrocyclotron frequency. For numerical simulation were adopted parameters of experimental sample of Multiwave Cherenkov Generator(MVCHG) operating near pi-type high-frequency cutoff.