Affiliation: | a Institut für Physik, Universität Rostock, D-18051 Rostock, Germany;b Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, CA 90095, USA;c Lawrence Livermore National Laboratory, P.O. Box 808, L-399, Livermore, CA 94551, USA;d DESY, Notkestraße 85, D-22607 Hamburg, Germany;e European XFEL GmbH, Albert-Einstein-Ring 19, D-22761 Hamburg, Germany |