2021/04/22 by Ruslan Khubbutdinov, Khubbutdinov, Ruslan, Natalia Gerasimova +35
Physics and Astronomy · Materials Science · #Advanced X-ray Imaging Techniques #Enzyme Structure and Function #Crystallography and Radiation Phenomena
paper · pdf · doi:10.48550/arxiv.2104.11136
Second-order intensity interferometry was employed to study the spatial and\ntemporal properties of the European X-ray Free-Electron Laser (EuXFEL).\nMeasurements were performed at the soft X-ray SASE3 undulator beamline at a\nphoton energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE)\nmode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and\nquadratic tapering at saturation, were studied in detail and compared with the\nlinear gain regime. The statistical analysis showed an exceptionally high\ndegree of spatial coherence up to 90% for the linear undulator tapering.\nAnalysis of the measured data in spectral and spatial domains provided an\naverage pulse duration of about 10 fs in our measurements. The obtained results\nwill be valuable for the experiments requiring and exploiting short pulse\nduration and utilizing high coherence properties of the EuXFEL.\n