[1] Ecole Polytech, Lab Utilisat Lasers Intenses, F-91128 Palasiseau, France
[2] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[3] Air Force Res Lab, Prop Syst Directorate, Wright Patterson AFB, OH 45433 USA
[4] Queens Univ Belfast, Sch Math & Phys, Ctr Plasma Phys, Belfast BT7 1NN, Antrim, North Ireland
[5] Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England
[6] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany
[7] Univ London Imperial Coll Sci Technol & Med, Dept Phys, Blackett Lab, John Adams Inst, London SW7 2AZ, England
[8] Univ Oxford, Dept Phys, Oxford OX1 3PU, England
[9] Helmholtz Inst Jena, D-07743 Jena, Germany
[10] ASCR, ELI Beamlines Project, Inst Phys, Prague 18221, Czech Republic