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Information × Registration Number 0219U006048, 0116U006732 , R & D reports Title Multiharmonic resonant interactions in two-stream superheterodyne free electron lasers with helical electron beams popup.stage_title Head Lysenko Oleksandr Volodymyrovych, Доктор фізико-математичних наук Registration Date 02-04-2019 Organization Sumy State University popup.description2 The purpose of work is to determine the basic physical laws associated with multiharmonic resonant interactions in two-stream superheterodyne free electron lasers (TSFELs) of H-ubitron type with helical electron beams, to find out the effective operation modes of TSFELs, and to determine the conditions under which it becomes possible to form intensive electromagnetic waves with a wide frequency spectrum. Research methods - the hierarchical approach to the theory of oscillations and waves is used as the basic mathematical apparatus for the theoretical research of nonlinear processes in superheterodyne FELs. Standard numerical and numerical-analytical methods, including the method of slowly varying amplitudes are used. A self-consistent cubic-nonlinear theory of multiharmonic two-current SFEL of a klystron type with H-Ubitron pump with helical relativistic electron beams is constructed. We have taken into account the plural three-wave resonant interactions of different wave types. It is shown that the growth rates of electromagnetic waves in TSFEL with helical REBs are significantly higher, and the saturation lenght is much smaller, which allows to reduce the longitudinal dimensions of TSFEL. Optimal operating modes are found out. Product Description popup.authors Брусник Алла Юріївна Волк Юрій Юрійович Коваль Віталій Вікторович Олексієнко Галина Андріївна popup.nrat_date 2020-04-02 Close