1. Laboratoire pour l'Utilisation des Lasers Intenses, École Polytechnique, 91128 Palasiseau, France
2. Physics Department, The Ohio State University, Columbus, Ohio 43210, USA
3. Propulsion Systems Directorate, Air Force Research Lab, Wright Patterson Air Force Base, Ohio 45433, USA
4. Centre for Plasma Physics, School of Mathematics and Physics, Queens University Belfast, Belfast BT7 1NN, United Kingdom
5. Central Laser Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom
6. Institut für Kernphysik, Technische Universität Darmstadt, Schloβgartenstrasse 9, D-64289 Darmstadt, Germany
7. The John Adams Institute, Blackett Laboratory, Department of Physics, Imperial College, London SW7 2AZ, United Kingdom
8. Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom
9. Helmholtz Institute Jena, D-07743 Jena, Germany
10. Institute of Physics of the ASCR, ELI-Beamlines Project, Na Slovance 2, 18221 Prague, Czech Republic