2005, Vol.8, No.4, pp.359-365
Oscillation and amplification regimes of Volume Free
Electron Laser (VFEL) operation under condition of multiwave
volume distributed feedback (VDFB) are discussed. Electron beam
instabilities in VFEL transfer it to regenerative amplification
regime (first transition point), steady oscillation regime (second
transition point), to nonstationary oscillation regime and through
the series of transition points to chaos under increasing current.
Nonstationary regime is characterized by changing of oscillation
frequency in series of transition points. Some results are
obtained analytically. Most part of results is produced by
numerical simulation of nonlinear VFEL dynamics. Dependence of
transition currents in transition (bifurcation) points on VFEL
parameters is demonstrated.
Key words:
Volume Free Electron Laser, quasi-Cherenkov
instability
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