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Focusing effect and modulation mechanism of the beam self-fields on the electron's Larmor rotation in the free-electron laser with an axial guide magnetic field
ZHANG Shi-Chang * #
School of Physics and Chemistry, Xihua University, and Institute of Photoelectronics, Southwest Jiaotong University
*Correspondence author
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Funding: none
Opened online:22 November 2012
Accepted by: none
Citation: ZHANG Shi-Chang.Focusing effect and modulation mechanism of the beam self-fields on the electron's Larmor rotation in the free-electron laser with an axial guide magnetic field[OL]. [22 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4495813
 
 
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 electron's 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.
Keywords:free electron; Larmor motion; self-field focusing
 
 
 

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