1. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
2. University of California, Berkeley, California 94720, USA
3. University of Eindhoven, 5612 AE Eindhoven, The Netherlands
4. Keldysh Institute of Applied Mathematics RAS, Moscow 125047, Russia
5. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow 115409, Russia
6. Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines Project, 182 21 Prague, Czech Republic