P-8 · Self-field in free-electron laser with planar wiggler and ion-channel guiding

Farokhi, Bijan1)

1) Institute for studies in theoretical physics and mathematics P. O. Box 19395 -5531, Tehran, Iran
Department of Physics, Bu-Ali Sina University, Hamadan, Iran

Abstract

A self- consistent method for the analysis of self electric and self magnetic field for a free-electron laser with a one-dimensional planar wiggler and ion-channel guiding is presented. The equilibrium orbits and their stability, under the influence of self-electric and self-magnetic fields are analyzed. New unstable orbits, in the first part of the group I orbits and in the resonance region of the group II orbits, are found. It is shown that an increase in the defocusing effect of self-field will widen the unstable orbits. An anomalous self-field regime is found where an increase in the defocusing effect of selffield can have stabilizing effect on the resonance region. The application of an ionchannel as an electron beam-guiding medium not only eliminates the use of solenoid or quadruple magnets , but also allows for beam currents higher than the vacuum limit .

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