Stabilizing the intensity for a Hamiltonian model of the FEL

Details Stabilizing the intensity for a Hamiltonian model of the FEL Stabilizing the intensity for a Hamiltonian model of the FEL

2008-07-02

arxiv.org/abs/0807.0286v1

Physics

Plasma Physics

Scientific paper

10.1016/j.nima.2008.04.050

The intensity of an electromagnetic wave interacting self-consistently with a beam of charged particles, as in a Free Electron Laser, displays large oscillations due to an aggregate of particles, called the macro-particle. In this article, we propose a strategy to stabilize the intensity by destabilizing the macro-particle. This strategy involves the study of the linear stability of a specific periodic orbit of a mean-field model. As a control parameter - the amplitude of an external wave - is varied, a bifurcation occur in the system which has drastic effects on the self-consistent dynamics, and in particular, on the macro-particle. We show how to obtain an appropriate tuning of the control parameter which is able to strongly decrease the oscillations of the intensity without reducing its mean-value.

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