Abstract
It is revealed that at anti-resonance in a free-electron laser with a reversed guide magnetic field, the beam self-fields can act to focus the beam transport and prevent the electrons from striking on the waveguide wall before the wiggler exit. It is found that the focusing function results from the modulation of the periodically-varying self-field tangential and normal components on the electronʼs Larmor rotation. As a potential application, substantial improvement of the wave gain and output power at anti-resonance could be expected, since the beam current loss can be obviated by using this modulation mechanism. ► Beam self-field periodically acts on an electron with off-axis guiding center. ► This periodic varying field modulates the electronʼs Larmor rotation. ► Modulation results in a focusing effect on the e-beam transport at anti-resonance. ► Remarkable focusing effect relies on the beam current parameter.
Published Version
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