Effect of undulator harmonics field on free-electron laser harmonic generation

The harmonics field effect of a planar undulator on free-electron laser (FEL) harmonic generation has been analyzed. For both the linear case and the nonlinear case, the harmonic fraction of the radiation can be characterized by the coupling coefficients. The modification of the coupling coefficient...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2011-06, Vol.14 (6), p.060702, Article 060702
Main Author: Jia, Qika
Format: Article
Language:English
Subjects:
Coupling coefficients
Free electron lasers
Harmonic generations
Harmonic radiation
Magnetic fields
Numerical prediction
Radiation
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Summary:The harmonics field effect of a planar undulator on free-electron laser (FEL) harmonic generation has been analyzed. For both the linear case and the nonlinear case, the harmonic fraction of the radiation can be characterized by the coupling coefficients. The modification of the coupling coefficients is given when the third harmonics magnetic field component exists, thus the enhancement of the harmonic radiation can be predicted. The numerical results show that with the third harmonics magnetic field component that has the opposite sign to the fundamental, the intensity of third-harmonic radiation can be increased distinctly for both the small signal gain and the nonlinear harmonic generation. The increase is larger for the smaller undulator deflecting parameter.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.14.060702