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Information × Registration Number 0218U006450, 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 15-05-2018 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. We have elaborated the cubic nonlinear theory of plural resonant interactions of growing space charge wave (SCW) harmonics in the transit section of the two-stream free-electron laser of a klystron type with helical electron beam. Different REB parameters such as the input angle with respect to focusing magnetic field, the average relativistic factor value, the difference of partial relativistic factors, the plasma frequency of partial beams were investigated regarding their influence on the frequency spectrum width and the multiharmonic SCW saturation levels. Product Description popup.authors Волк Юрій Юрійович Князь Ігор Олександрович Коваль Віталій Вікторович Олексієнко Галина Андріївна Ромбовський Михайло Юрійович popup.nrat_date 2020-04-02 Close