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  4. A hard x-ray split-and-delay unit for the HED instrument at the European XFEL
 
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2017
Conference Paper
Title

A hard x-ray split-and-delay unit for the HED instrument at the European XFEL

Abstract
For the High Energy Density Instrument (HED) at the European XFEL a hard x-ray split-and-delay unit (SDU) is built covering photon energies in the range between 5 keV and 24 keV. This SDU enables time-resolved x-ray pump / x-ray probe experiments as well as sequential diffractive imaging on a femtosecond to picosecond time scale. The set-up is based on wavefront splitting that 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 then pass variable delay lines. For different photon energies the angle of incidence onto the multilayer mirrors is adjusted in order to match the Bragg condition. Hence, maximum delays between +/- 1 ps at 24 keV and up to +/- 23 ps at 5 keV will be possible. Time-dependent wave-optics simulations are performed with Synchrotron Radiation Workshop (SRW) software. The XFEL radiation is simulated using the output of the time-dependent SASE code FAST. For the simulations diffraction on the edge of the beam-splitter as well as height and slope errors of all eight mirror surfaces are taken into account. The impact of these effects on the ability to focus the beam by means of compound refractive lenses (CRL) is analyzed.
Author(s)
Roling, Sebastian
Westfälische Wilhelms-Universität
Kärcher, Victor
Westfälische Wilhelms-Universität
Samoylova, Liubov
European XFEL GmbH
Appel, Karen
European XFEL GmbH
Braun, Stefan
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Gawlitza, Peter  
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
Siewert, Frank
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Zastrau, Ulf
European XFEL GmbH
Rollnik, Matthias
Westfälische Wilhelms-Universität
Wahlert, Frank
Westfälische Wilhelms-Universität
Zacharias, Helmut
Westfälische Wilhelms-Universität
Mainwork
Advances in X-ray Free-Electron Lasers Instrumentation IV  
Conference
Conference "Advances in X-ray Free-Electron Lasers Instrumentation" 2017  
DOI
10.1117/12.2265750
Language
English
Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS  
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