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Coherence properties of the radiation from X-ray free electron laser

Abstract

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, {epsilon}=2{pi} {epsilon}/{lambda}. Our studies show that optimum performance of the XFEL in terms of transverse coherence is achieved at the value of the parameter {epsilon} of about unity. At smaller values of {epsilon} 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. (orig.)
Publication Date:
Aug 15, 2006
Product Type:
Technical Report
Report Number:
DESY-06-137
Subject:
43 PARTICLE ACCELERATORS; FREE ELECTRON LASERS; GAIN; OPTIMIZATION; COMPUTERIZED SIMULATION; LASER RADIATION; COHERENT RADIATION; X RADIATION; BEAM EMITTANCE; ELECTRON BEAMS; BEAM TRANSPORT; BETATRON OSCILLATIONS
OSTI ID:
20833933
Research Organizations:
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ISSN 0418-9833; TRN: DE07F2642
Availability:
INIS
Submitting Site:
DEN
Size:
26 pages
Announcement Date:
Feb 17, 2007

Citation Formats

Saldin, E L, Schneidmiller, E A, and Yurkov, M V. Coherence properties of the radiation from X-ray free electron laser. Germany: N. p., 2006. Web.
Saldin, E L, Schneidmiller, E A, & Yurkov, M V. Coherence properties of the radiation from X-ray free electron laser. Germany.
Saldin, E L, Schneidmiller, E A, and Yurkov, M V. 2006. "Coherence properties of the radiation from X-ray free electron laser." Germany.
@misc{etde_20833933,
title = {Coherence properties of the radiation from X-ray free electron laser}
author = {Saldin, E L, Schneidmiller, E A, and Yurkov, M V}
abstractNote = {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, {epsilon}=2{pi} {epsilon}/{lambda}. Our studies show that optimum performance of the XFEL in terms of transverse coherence is achieved at the value of the parameter {epsilon} of about unity. At smaller values of {epsilon} 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. (orig.)}
place = {Germany}
year = {2006}
month = {Aug}
}