Nonlinear Phenomena in Complex Systems, 2013, Vol.16, No.3, pp.209-216

NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2013, Vol.16, No.3, pp.209-216

Nonlinear Effects in Generation of Radiation by Relativistic Electron Beams in One-Dimensional Periodic Structures
V. G. Baryshevsky and P. V. Molchanov

Nonlinear processes can significantly influence the operation of different types of electromagnetic radiation sources driven by intense relativistic electron beams. This paper considers the transfer from a chaotic to a single-frequency regime of generation by the example of radiation sources, driven by the relativistic beams moving in one-dimensional periodic structures. It is shown that by shifting the operating point of generation close to the upper end of a passband wave and using the adjustable feedback reflector for a backward wave, one can suppress the parasitic generation waves and obtain a single-mode oscillation. As a result, the radiation power significantly increases compared to the case of a chaotic regime of generation. The experimental results presented in this paper demonstrate such an increase of the radiation power in relativistic backward wave oscillators.

Key words: volume free electron laser, backward wave oscillator, chaotic generation regime

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