Stuttgart 2012 – wissenschaftliches Programm

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K: Fachverband Kurzzeitphysik

K 4: Poster I

K 4.6: Poster

Dienstag, 13. März 2012, 16:30–18:30, Poster.V

An x-ray split- and delay-unit for the European XFEL — •Sebastian Roling, Björn Siemer, Michael Wöstmann, Frank Wahlert, and Helmut Zacharias — Physikalisches Institut WWU Münster, Wilhelm-Klemm Straße 10 48149 Münster

For the European XFEL an x-ray split- and delay-unit (autocorrelator) is built covering photon energies from 8 keV up to 20 keV. The autocorrelator will enable jitter-free x-ray pump / x-ray probe experiments as well as sequential diffractive imaging [1]. Further a direct measurement of the temporal coherence properties will be possible by making use of a linear autocorrelation. The set-up is based on geometric wave-front beam-splitting, which has successfully been applied at an autocorrelator that was built for FLASH [1-3]. The x-ray FEL pulses will be split by a sharp edge of a silicon substrate coated with Mo/B4C multi-layers. Both partial beams will then pass variable delay lines. For different wavelength the angle of the multilayer-mirrors will be adjusted in order to match the reflection condition. According to this alignment the path-lengths of the beam will differ as a function of the wavelength. This results in maximum delays from ±4 ps at 20 keV up to ± 30 ps at 8 keV.

[1] Günther et al., Nature Photonics 5, 99-102 (2011) [2] Mitzner et al., Optics Express 16, 19909-19919 (2008) [3] Mitzner et al., Physical Review A 80, 025402 (2009) [4] Roling et al., Phys. Rev. ST Accel. Beams 14, 080701 (2011)