Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.63: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
A split-and-delay unit for the European XFEL — •Sebastian Roling1, Liubov Samoylova2, Stefan Braun3, Frank Siewert4, Björn Siemer1, Harald Sinn2, Frank Wahlert1, Michael Wöstmann1, and Helmut Zacharias1 — 1Physikalisches Institut WWU Münster, 48149 Münster, Germany — 2European XFEL GmbH, 22761 Hamburg, Germany — 3Fraunhofer IWS, 01277 Dresden, Germany — 4HZB, 12489 Berlin, Germany
For the European XFEL an x-ray split- and delay-unit (SDU) is built covering photon energies from 5 keV up to 20 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. Further, direct measurements of the temporal coherence properties will be possible by making use of a linear autocorrelation. The set-up is based on geometric wavefront beam splitting, which has successfully been implemented at an autocorrelator at FLASH. The x-ray FEL pulses will be split by a sharp edge of a silicon mirror coated with Mo/B4C and W/B4C multilayers. Both partial beams will then pass variable delay lines. For different wavelengths the angle of incidence onto the multilayer mirrors is adjusted in order to match the Bragg condition. For a photon energy of hν = 20 keV a grazing angle of θ = 0.57° has to be set, while for hν = 5 keV the angle amounts to θ = 2.3°. Because of the different incidence angles, the path lengths of the beams will differ as a function of wavelength. Hence, maximum delays between 2.5 ps at hν = 20 keV and up to 36 ps at hν = 5 keV will be possible.