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| WG316 |
Analysis of Spontaneous Emission and its Self-Amplification in Free-Electron Laser
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- Q. K. Jia
USTC/NSRL, Hefei, Anhui
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The spontaneous emission and the self-amplified spontaneous emission (SASE) in free-electron laser are investigated from the one-dimensional Maxwell wave equation in the time domain. The explicit expressions of the incoherent spontaneous emission and the coherent spontaneous emission are deduced for an arbitrary electron pulse profile, it show that both are related to the slippage distance. The effective start-up power of SASE for a long electron bunch is obtained with the time domain approach, it is composed of the shot noise term and the super radiant term, corresponding the incoherent spontaneous emission and the coherent spontaneous emission respectively. The shot noise term is found to be equal to the usual spontaneous undulator radiation in the one power gain length. An analytical estimation of saturation power and saturation length of SASE is presented.
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Slides
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| WG317 |
An Analysis of Nonlinear Harmonic Generation
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- Q. K. Jia
USTC/NSRL, Hefei, Anhui
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The nonlinear harmonic generation in high gain free electron laser is analysed in a perspicuous way. The harmonic interactions and evolution is shown explicitly. One-dimensional analytical equations for nonlinear harmonic generation in both SASE FEL and HGHG FEL are given.
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Slides
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| WG323 |
Shanghai DUV-FEL Progress
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- Z. Zhao, Y. Cao, M. Chen, Z. M. Dai, H. X. Deng, Q. Gu, D. M. Li, D. G. Li, D. K. Liu, K. R. Ye, M. H. Zhao, X. F. Zhao, Q. G. Zhou
SINAP, Shanghai
- S. Y. Chen
IHEP Beijing, Beijing
- J. P. Dai
IHEP, Beijing
- H. He, Q. K. Jia
USTC/NSRL, Hefei, Anhui
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Funding: Supported by the Major State Basic Research Development Programme of China under Grant No. 2002CB713600, the Chinese Academy of Sciences, and the National Natural Science Foundation of China.
The SDUV-FEL has been designed as an HGHG type high gain FEL facility to provide high power coherent radiation from 262 nm to 88 nm, which consists of a 300 MeV S-band Linac, seeding laser, six sections of 1.5 m radiator undulator, one 0.8 m modulator undulator and one dispersion section. Its first 100 MeV Linac section has been successfully commissioned with a ns grid gun injector in 2005. A photocathode injector will replace the existing gun and buncher of the 100 MeV Linac in this year. The magnetic bunch compressor has been completed and will be installed in this year. The first 1.5 m radiator undulator has been fabricated and measured, and other five sections of radiator undulator are being under manufacture. The laser system for photocathode has been installed and commissioned. The photocathode RF gun and the FEL required beam diagnostics are under manufacture. In this paper, we also present the design optimization on the SDUV-FEL facility.
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