000001892 001__ 1892 000001892 005__ 20210301193027.0 000001892 02470 $$a1811.11446$$2arXiv 000001892 037__ $$aREPORT 000001892 041__ $$aeng 000001892 088__ $$aXFEL.EU TN-2018-003-01.0 000001892 245__ $$aROSA: Reconstruction of Spectrogram Autocorrelation for Self-Amplified Spontaneous Emission Free-Electron Lasers 000001892 260__ $$c2018 000001892 269__ $$a2018 000001892 336__ $$aReports 000001892 513__ $$aXFEL.EU Technical Note 000001892 520__ $$aIn recent years X-ray Free Electron Lasers (XFELs) proved to be unmatched sources of ultrashort pulses of spatially coherent quasimonochromatic X-ray radiation. Diagnostics of XFEL emission properties, in particular pulse duration, spectrum and temporal profile is extremely important in order to analyze the experimental results. In this paper we propose a cost-effective method to examine these properties of Self-Amplified Spontaneous Emission (SASE) pulses. It only requires an ensemble of measured SASE spectra and provides the temporal autocorrelation of the ensemble-averaged Wigner distribution of SASE FEL pulses. 000001892 546__ $$aEnglish 000001892 655__ $$aX-ray scattering, X-ray optics, and instrumentation techniques 000001892 690__ $$aExperimental techniques 000001892 7001_ $$aSerkez, Svitozar$$0XFEL855 000001892 7001_ $$aGorobtsov, Oleg 000001892 7001_ $$aSobko, Bohdana 000001892 7001_ $$aGerasimova, Natalia$$0XFEL489 000001892 7001_ $$aGeloni, Gianluca$$0XFEL67 000001892 790__ $$aEuXFEL staff 000001892 790__ $$aOther 000001892 85641 $$uhttps://arxiv.org/abs/1811.11446 000001892 8560_ $$fkurt.ament@xfel.eu 000001892 8564_ $$9ce78f06e-35e3-41c9-9cff-2cb65cf0c39c$$s1872001$$uhttps://xfel.tind.io/record/1892/files/TN-2018-003-01.0_ROSA.pdf 000001892 900__ $$aSimulation of Photon Fields 000001892 909CO $$ooai:xfel.tind.io:1892$$pGLOBAL_SET 000001892 945__ $$aREPORT-2019-001 000001892 980__ $$aREPORT