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Information × Registration Number 0223U001619, 0121U110449 , R & D reports Title Powerful compact oscillators and amplifiers of electromagnetic radiation of THz frequency range with broadband electronic frequency tuning popup.stage_title Head Kishko Sergey , к.ф.-м.н. Registration Date 01-02-2023 Organization O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine popup.description2  As a result of the NDR, a three-dimensional numerical model of the interaction of the sheet electron beam with hybrid bulk-surface waves in systems with periodic-inhomogeneous gratings in the waveguide was built, which takes into account the three-dimensional motion of a wide sheet electron beam and its velocity profile, and the properties of propagating waves were investigated in such a structure. The parameters of two-stage and three-stage periodically-inhomogeneous circuits were defined in order to provide the widest bandwidth of synchronous beam-wave interaction with the forward harmonics in the higher pass-band. The regimes of beam-wave interaction were defined for high coupling impedance and low high-frequency ohmic losses. The effect of an interaction of modes with different transverse indices has been studied. The possibility of simultaneous interaction of a sheet beam with two modes differing in transverse index at the same frequency in oversized waveguide with periodically-inhomogeneous grating has been shown. The effect of traveling-wave amplification in an oversized waveguide with a threestage grating has been experimentally demonstrated. The effect of wave amplification during the synchronous interaction of the sheet electron beam with the harmonic field of the second passband of the fundamental mode of an oversized waveguide with a three-stage grating has been experimentally demonstrated. According to the results of numerical simulations and experimental studies, the possibility of simultaneous interaction of the sheet electron beam with two modes of an oversized waveguide with a periodically inhomogeneous grating, differing in the transverse index, at the same frequency is shown. The novelty and practical significance of the obtained results lies in new knowledge about the interaction of the sheet electron beam with the waves of an oversized waveguide with a periodically inhomogeneous grating, in particular in the field of mode interaction, where the Product Description popup.authors Kovshov Yurii Likhachev Oleksandr O. Ponomarenko Sergii S. popup.nrat_date 2023-02-01 Close