1. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow 125047, Russia
2. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3. Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
4. Institute of Physics ASCR, v.v.i. (FZU), ELI-Beamlines, 182 21 Prague, Czech Republic
5. National Institutes for Quantum and Radiological Science and Technology (QST), Kansai Photon Science Institute, Kizugawa, Kyoto 619-0215, Japan