[1] Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland
[2] JAEA, APRC, Kyoto 6190215, Japan
[3] Prokhorov Inst Gen Phys RAS, Moscow 119991, Russia
[4] Univ Paris 06, Ecole Polytech, CEA,CNRS,UMR 7605, LULI, F-91128 Palaiseau, France
[5] Univ Bordeaux 1, CNRS, CEA, Ctr Lasers Intenses & Applicat, F-33405 Talence, France
[6] Univ Dusseldorf, Inst Laser & Plasmaphys, Dusseldorf, Germany
[7] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA