"TITLE","AUTHORS","SUBJECT","SUBJECT_RELATED","DESCRIPTION","PUBLISHER","AVAILABILITY","RESEARCH_ORG","SPONSORING_ORG","PUBLICATION_COUNTRY","PUBLICATION_DATE","CONTRIBUTING_ORGS","LANGUAGE","RESOURCE_TYPE","TYPE_QUALIFIER","JOURNAL_ISSUE","JOURNAL_VOLUME","RELATION","COVERAGE","FORMAT","IDENTIFIER","REPORT_NUMBER","DOE_CONTRACT_NUMBER","OTHER_IDENTIFIER","DOI","RIGHTS","ENTRY_DATE","OSTI_IDENTIFIER","PURL_URL" "Statistical and coherence properties of radiation from X-ray free electron lasers","Saldin, E L; Schneidmiller, E A; Yurkov, M V","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","","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.)","","Commercial reproduction prohibited; INIS; OSTI as DE21269917","Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)","","Germany","2009-12-15","","English","Technical Report","","","","","Miscellaneous","Medium: ED; Size: 16 pages","ISSN 0418-9833","DESY-09-224","","Other: ISSN 0418-9833; TRN: DE10F1023","https://doi.org/","","2010-03-11","21269917","https://www.osti.gov/etdeweb/servlets/purl/21269917"