Harmonic operation of high gain harmonic generation free electron laser

DENG Hai-Xiao; DAI Zhi-Min

doi:10.1088/1674-1137/32/7/017

Chinese Physics C> 2008, Vol. 32> Issue(7) : 593-598 DOI: 10.1088/1674-1137/32/7/017

Harmonic operation of high gain harmonic generation free electron laser

DENG Hai-Xiao ^, ,
DAI Zhi-Min

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Abstract：
In high gain harmonic generation (HGHG) free electron laser (FEL), with the right choice of parameters of the modulator undulator, the dispersive section and the seed laser, one may make the spatial bunching of the electron beam density distribution correspond to one of the harmonic frequencies of the radiator radiation, instead of the fundamental frequency of the radiator radiation in conventional HGHG, thus the radiator undulator is in harmonic operation (HO) mode. In this paper, we investigate HO of HGHG FEL. Theoretical analyses with universal method are derived and numerical simulations in ultraviolet and deep ultraviolet spectral regions are given. It shows that the power of the 3rd harmonic radiation in the HO of HGHG may be as high as 18.5% of the fundamental power level. Thus HO of HGHG FEL may obtain short wavelength by using lower beam energy.

References

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DENG Hai-Xiao and DAI Zhi-Min. Harmonic operation of high gain harmonic generation free electron laser[J]. Chinese Physics C, 2008, 32(7): 593-598. doi: 10.1088/1674-1137/32/7/017

DENG Hai-Xiao and DAI Zhi-Min. Harmonic operation of high gain harmonic generation free electron laser[J]. Chinese Physics C, 2008, 32(7): 593-598. doi: 10.1088/1674-1137/32/7/017 shu

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Received: 2007-09-17
Revised: 2007-09-29

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Harmonic operation of high gain harmonic generation free electron laser

Corresponding author: DENG Hai-Xiao,

Received Date: 2007-09-17

Accepted Date: 2007-09-29

Available Online: 2008-07-05

Abstract:

In high gain harmonic generation (HGHG) free electron laser (FEL), with the right choice of parameters of the modulator undulator, the dispersive section and the seed laser, one may make the spatial bunching of the electron beam density distribution correspond to one of the harmonic frequencies of the radiator radiation, instead of the fundamental frequency of the radiator radiation in conventional HGHG, thus the radiator undulator is in harmonic operation (HO) mode. In this paper, we investigate HO of HGHG FEL. Theoretical analyses with universal method are derived and numerical simulations in ultraviolet and deep ultraviolet spectral regions are given. It shows that the power of the 3rd harmonic radiation in the HO of HGHG may be as high as 18.5% of the fundamental power level. Thus HO of HGHG FEL may obtain short wavelength by using lower beam energy.

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Harmonic operation of high gain harmonic generation free electron laser

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