Abstract
In many free electron laser (FEL) experiments, to transport kA current through the wiggler, an axial guide magnetic field must be imposed in addition to the wiggler. The combined effect of a helical wiggler and a solenoidal field on electron-wave interaction is studied with computer simulations. It is found that a ‘hybrid’ FEL-cyclotron instability can occur at a modified second harmonic FEL resonance. High efficiency has been obtained with this instability. The cyclotron maser instability, at the Doppler-shifted electron cyclotron resonance, will occur only if the electron beam possesses a DC transverse momentum. In this case, the perturbing effects of the wiggler can be used to enhance the gain and efficiency in the Doppler-shifted autoresonance regime. 3-D simulation results of these effects, in waveguide configuration, will be described
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