[1] Helmholtz Zentrum Dresden Rossendorf HZDR, Bautzner Landstr 400, D-01328 Dresden, Germany
[2] Tech Univ Dresden, D-01062 Dresden, Germany
[3] SLAC Natl Accelerator Lab, High Energy Dens Sci Div, Menlo Pk, CA 94025 USA
[4] Univ Alberta, Dept Elect & Comp Engn, Edmonton, AB T6G 1H9, Canada
[5] European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany
[6] Univ Rostock, Albert Einstein Str 23-24, D-18059 Rostock, Germany
[7] Friedrich Schiller Univ Jena, Max Wien Pl 1, D-07743 Jena, Germany