Author Affiliations

Young Yong Kim,^1,# Luca Gelisio,^1,# Giuseppe Mercurio,² Siarhei Dziarzhytski,¹ Martin Beye,¹ Lars Bocklage,¹ Anton Classen,^3,$ Christian David,⁴ Oleg Yu. Gorobtsov,^1,% Ruslan Khubbutdinov,^1,5 Sergey Lazarev,^1,6 Nastasia Mukharamova,¹ Yuri N. Obukhov,⁷ Benedikt Rösner,⁴ Kai Schlage,¹ Ivan A. Zaluzhnyy,^1,& Günter Brenner,¹ Ralf Röhlsberger,^1,8 Joachim von Zanthier,³ and Ivan A. Vartanyants^1,5,*

¹Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany

²European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany

³Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, Staudtstrasse 1, 91058 Erlangen, Germany

⁴Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

⁵National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409 Moscow, Russia

⁶National Research Tomsk Polytechnic University (TPU), pr. Lenina 30, 634050 Tomsk, Russia

⁷Theoretical Physics Laboratory, Nuclear Safety Institute, Russian Academy of Sciences, B. Tulskaya 52, 115191 Moscow, Russia

⁸Helmholtz-Institut Jena, Max-Wien-Platz 1, 07743 Jena, Germany

^#Present address: European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany

^$Present address: Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA

^%Present address: Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14850, USA

^&Present address: Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

^*Corresponding author: Ivan.Vartaniants@desy.de