1. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2. University of Nevada, Reno, Nevada 89557, USA
3. LULI, Ecole Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau Cedex, France
4. Directorate of Science and Technology, AWE plc, Reading RG7 4PR, United Kingdom
5. University of Alberta, Edmonton, Alberta T6G 2R3, Canada
6. LLE, University of Rochester, Rochester, New York 14623, USA