Abstract

We analyze the characteristics of a Free-Electron Laser (circular FEL) with a rotating electron beam in a uniform axial magnetic field and in azimuthal wiggler field, both in the low gain regime and the high gain regime, and compare with a conventional linear FEL. For a cold electron beam, the growth rate and efficiency of the circular FEL are higher than those of a conventional FEL, by a factor γ2/3, for fixed frequency. However, the circular FEL performance is more sensitive to the energy spread than the linear FEL. We also examine the influence of the negative mass instability on the circular FEL.

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