Search academic texts

Information × Registration Number 0222U004431, 0120U102140 , R & D reports Title Multiharmonic processes in klystron-type free electron lasers popup.stage_title Head Lysenko Oleksandr V., Доктор фізико-математичних наук Registration Date 01-08-2022 Organization Sumy State University popup.description2  The object of research is the processes of electromagnetic wave emission by relativistic electron beams (REB) in the klystron type multiharmonic free electrons lasers (FEL) with a space charge wave amplifier. The subject of research is the electromagnetic wave dynamics in klystron type multiharmonic FEL taking into account multiple three-wave parametric interactions. The work aims to establish the basic physical laws associated with the formation of powerful electromagnetic radiation with a wide frequency spectrum in the millimeter-infrared wavelength range by the multiharmonic klystron type FEL. Research methods are quasi-hydrodynamic equation, continuity equation, and Maxwell's equation. The method of averaged characteristics was used to solve motion problems and the continuity equation. The method of slowly varying amplitudes was used to solve the field problem. Standard numerical methods were also used. The quadratic nonlinear approximation analyzes the amplifying characteristics of single-stream superheterodyne FEL, which uses two mechanisms of electromagnetic signal amplification: the mechanism of parametric amplification of the electromagnetic wave using a traditional undulator with a transverse periodic-reversible magnetic field and an additional amplification mechanism using a longitudinal electrostatic undulator. The expression for the wave increment, which is associated with both the parametric instability of the transverse waves and the parametric instability of the longitudinal waves in the electrostatic undulator, is obtained and analyzed. The prospects of using such superheterodyne FEL as powerful amplifiers in the millimeter-submillimeter wavelength range have been demonstrated. Product Description popup.authors Ilin Stanislav S. Volk Iurii Yu. Korovai Mykhailo O. Oleksiienko Galyna A. Shevchenko Alina T. popup.nrat_date 2022-08-01 Close