[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[2] Univ Oxford, Dept Phys, Parks Rd, Oxford OX1 3PU, England
[3] Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, North Ireland
[4] Alamos Natl Lab, Appl & Fundamental Phys P-2, Los Alamos, NM 87544 USA
[5] Princeton Plasma Phys Lab, Princeton, NJ 08540 USA
[6] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08540 USA
[7] Sorbonne Univ, Ecole Polytech, Inst Polytech Paris, Univ Paris 06,LULI,CNRS,CEA, Palaiseau, France
[8] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
[9] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[10] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
[11] Univ Michigan, Gerard Mourou Ctr Ultrafast Opt Sci, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA