1. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2. Department of Physics, University of California, Berkeley, California 94720, USA
3. Institut für Physik, Universität Rostock, 18051 Rostock, Germany
4. CNRS, École Normale Supérieure de Lyon, Laboratoire de Géologie de Lyon LGLTPE UMR 5276, Centre Blaise Pascal, 46 allée d'Italie Lyon 69364, France
5. SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
6. Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
7. Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA
8. Department of Nuclear Engineering and Radiation Science, University of Michigan, Ann Arbor, Michigan 48109, USA
9. GSI Helmholtz-Zentrum für Schwerionenforschung, 64291 Darmstadt, Germany
10. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA