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Statistical and coherence properties of radiation from X-ray free electron lasers

Abstract

We describe statistical and coherence properties of the radiation from X-ray free electron lasers (XFEL). It is shown that the X-ray FEL radiation before saturation is described with gaussian statistics. Particularly important is the case of the optimized X-ray FEL, studied in detail. Applying similarity techniques to the results of numerical simulations allowed us to find universal scaling relations for the main characteristics of an X-ray FEL operating in the saturation regime: efficiency, coherence time and degree of transverse coherence. We find that with an appropriate normalization of these quantities, they are functions of only the ratio of the geometrical emittance of the electron beam to the radiation wavelength. Statistical and coherence properties of the higher harmonics of the radiation are highlighted as well. (orig.)
Publication Date:
Dec 15, 2009
Product Type:
Technical Report
Report Number:
DESY-09-224
Subject:
43 PARTICLE ACCELERATORS; BEAM EMITTANCE; COHERENT RADIATION; EFFICIENCY; ELECTRON BEAMS; FREE ELECTRON LASERS; FREQUENCY DEPENDENCE; HARMONICS; LASER RADIATION; ONE-DIMENSIONAL CALCULATIONS; SCALING LAWS; STATISTICS; X RADIATION
OSTI ID:
21269917
Research Organizations:
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ISSN 0418-9833; TRN: DE10F1023
Availability:
Commercial reproduction prohibited; INIS; OSTI as DE21269917
Submitting Site:
DEN
Size:
16 pages
Announcement Date:
Mar 04, 2010

Citation Formats

Saldin, E L, Schneidmiller, E A, and Yurkov, M V. Statistical and coherence properties of radiation from X-ray free electron lasers. Germany: N. p., 2009. Web.
Saldin, E L, Schneidmiller, E A, & Yurkov, M V. Statistical and coherence properties of radiation from X-ray free electron lasers. Germany.
Saldin, E L, Schneidmiller, E A, and Yurkov, M V. 2009. "Statistical and coherence properties of radiation from X-ray free electron lasers." Germany.
@misc{etde_21269917,
title = {Statistical and coherence properties of radiation from X-ray free electron lasers}
author = {Saldin, E L, Schneidmiller, E A, and Yurkov, M V}
abstractNote = {We describe statistical and coherence properties of the radiation from X-ray free electron lasers (XFEL). It is shown that the X-ray FEL radiation before saturation is described with gaussian statistics. Particularly important is the case of the optimized X-ray FEL, studied in detail. Applying similarity techniques to the results of numerical simulations allowed us to find universal scaling relations for the main characteristics of an X-ray FEL operating in the saturation regime: efficiency, coherence time and degree of transverse coherence. We find that with an appropriate normalization of these quantities, they are functions of only the ratio of the geometrical emittance of the electron beam to the radiation wavelength. Statistical and coherence properties of the higher harmonics of the radiation are highlighted as well. (orig.)}
place = {Germany}
year = {2009}
month = {Dec}
}