Setting up optimal radiation regimes of helical relativistic electron beams requires a definite value of the electron pitch factor. The presence of a transverse inhomogeneity of the pumping field in real undulators leads to the following two main consequences: a widening of the nonlinear resonance and a drift of the guiding centers of the particles. A theory of these effects is developed for symmetric and asymmetric undulators with a homogeneous guiding magnetic field.
Department of Physical Electronics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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