High spatial coherence and short pulse duration revealed by the Hanbury Brown and Twiss interferometry at the European XFEL
Ruslan Khubbutdinov, Natalia Gerasimova, Giuseppe Mercurio, Dameli Assalauova, Jerome Carnis, Luca Gelisio, Loïc le Guyader, Alexandr Ignatenko, Young Yong Kim,… 展开作者
Ruslan Khubbutdinov, Natalia Gerasimova, Giuseppe Mercurio, Dameli Assalauova, Jerome Carnis, Luca Gelisio, Loïc le Guyader, Alexandr Ignatenko, Young Yong Kim, Benjamin van Kuiken, Ruslan P. Kurta, Dmitry Lapkin, Martin Teichmann, Alexander Yaroslavtsev, Oleg Gorobtsov, Aleksey P. Menushenkov, Matthias Scholz, Andreas Scherz, Ivan A. Vartanyants
Second-order intensity interferometry was employed to study the spatial and temporal properties of the European X-ray Free-Electron Laser (EuXFEL). Measurements were performed at the soft X-ray SASE3 undulator beamline at a photon energy of 1.2 keV in the Self-Amplified Spontaneous Emission (SASE) mode. Two high-power regimes of the SASE3 undulator settings, i.e. linear and quadratic tapering at saturation, were studied in detail and compared with the linear gain regime. The statistical analysis showed an exceptionally high degree of spatial coherence up to 90% for the linear undulator tapering. Analysis of the measured data in spectral and spatial domains provided an average pulse duration of about 10 fs in our measurements. The obtained results will be valuable for the experiments requiring and exploiting short pulse duration and utilizing high coherence properties of the EuXFEL.
