Coherence properties of the radiation from X-ray free electron laser
We present a comprehensive analysis of coherence properties of the radiation from X-ray free electron laser (XFEL). We consider practically important case when XFEL is optimized for maximum gain. Such an optimization allows to reduce significantly parameter space. Application of similarity technique...
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Published in | Optics communications Vol. 281; no. 5; pp. 1179 - 1188 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.03.2008
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | We present a comprehensive analysis of coherence properties of the radiation from X-ray free electron laser (XFEL). We consider practically important case when XFEL is optimized for maximum gain. Such an optimization allows to reduce significantly parameter space. Application of similarity techniques to the results of numerical simulations allows to present all output characteristics of the optimized XFEL as functions of the only parameter, ratio of the emittance to the radiation wavelength, ϵˆ=2πϵ/λ. Our studies show that optimum performance of the XFEL in terms of transverse coherence is achieved at the value of the parameter ϵˆ of about unity. At smaller values of ϵˆ the degree of transverse coherence is reduced due to strong influence of poor longitudinal coherence on a transverse one. At large values of the emittance the degree of transverse coherence degrades due to poor mode selection. Comparative analysis of existing XFEL projects, European XFEL, LCLS, and SCSS is presented as well. |
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ISSN: | 0030-4018 1873-0310 |
DOI: | 10.1016/j.optcom.2007.10.044 |