Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Interaction with VUV and X-ray light

A 34.2: Poster

Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik

Spatio- and time dependent Propagation Simulations of hard X-ray FEL radiation through the split-and-delay unit for the HED-instrument at the European XFEL — •Victor Kärcher¹, Sebastian Roling¹, Liubov Samoylova², Karen Appel², Frank Siewert³, Ulf Zastrau², Frank Wahlert¹, and Helmut Zacharias¹ — ¹Center for Soft Nanoscience, Münster, Germany — ²European XFEL, Schenefeld, Germany — ³Helmholtz-Zentrum für Materialien und Energie, Berlin, Germany

For the High Energy Density (HED) instrument at the SASE2 - Undulator at European XFEL an x-ray split-and-delay unit (SDU) is built covering photon energies from hν = 5 KeV up to hν = 24 KeV. This SDU will enable time-resolved x-ray pump / x-ray probe experiments as well as sequential diffractive imaging on a femtosecond to picosecond time scale. In order to reach intensities on the order of 10¹5 W/cm2 the XFEL pulses will be focused by means of compound refractive lenses (CRL) to a diameter of D = 24 µm. The influence of wavefront disturbances caused by height- and slope-errors of the mirrors inside the SDU on the quality of the two focused partial beams is studied by wavefront propagation simulations using the WPG-framework.