Author: Geloni, G.
Paper Title Page
Simulations and Performance Study of an Optimized Longitudinal Phase Space for the Hard X-Ray Self-Seeding at the European XFEL  
  • S. Liu, W. Decking, V. Kocharyan
    DESY, Hamburg, Germany
  • G. Geloni, S. Serkez
    XFEL. EU, Schenefeld, Germany
  A two-stage Hard X-ray Self-Seeding (HXRSS) set-up will be implemented at European XFEL in late 2018. For the demonstration of the HXRSS, short electron beam bunches (FWHM ≤ 50 fs) are preferred to mitigate spatio-temperal coupling effect and to fit to the seeding bump width. In preparation for the commissioning of the HXRSS, beam dynamics simulations have been performed to optimize the longitudinal phase space for a 100 pC electron beam with 5 kA peak current. Performance of the optimized longitudinal phase space will be studied using a transverse deflecting structure in early 2018. With the optimized electron beam, HXRSS simulations have been performed for the lower (~3 keV) and the upper (~14 keV) photon energy range planned for the HXRSS operation. The locations of the two HXRSS stages have been studied and chosen to optimize the performance of the upper photon energy with an insignificant effect on the lower one. We will present the longitudinal phase space optimization for the 100 pC case as well as the expected performance of the HXRSS with the optimized set-up.  
slides icon Slides TUP2WA04 [8.959 MB]  
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