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Sytova, S.

Paper Title Page
MOPPH005 Generation Regimes of FEL With Volume Distributed Feedback 41
 
  • K. G. Batrakov, S. Sytova
    Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk
  
  As was shown earlier*, threshold conditions for FEL with volume distributed feedback (VDFB) depends on geometry of Bragg diffraction. Present work considers nonlinear dynamics of quasi-Cherenkov (parametric) FEL, linear stage of generation of which was studied in previous works. Dependence of emission on electron beam density and diffraction geometry is produced using the computer code VOLC (volume laser code) created for simulation of volume FEL (VFEL). It is shown that operation regime of VFEL can be changed from amplification to regenerative amplification and to stationary and non-stationary generation by the changing of angle between transmitted and diffracted waves. Curves for dependence of threshold current and output power on diffraction geometry are built and discussed.

*V. G.Baryshevsky, K. G.Batrakov, I. Ya. Dubovskaya, Parametric (quasi-Cherenkov) X-ray FEL, Journal of Physics D, v.24, p. 1250 (1991).