1. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
3. CEA, DAM, DIF, F-91297 Arpajon, France
4. University Bordeaux-CNRS-CEA, CELIA, UMR 5107, 33405 Talence, France
5. CEA-CESTA, 15 avenue des Sablières, CS 60001, 33116 Le Barp Cedex, France