1. Plasma Physics Group, Radiation Physics Department, AWE plc, Reading RG7 4PR, United Kingdom
2. Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, United Kingdom
3. Department of Physics, University of California, Berkeley, California 94720, USA
4. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
5. SLAC National Accelerator Laboratory, Menlo Park, California 94309, USA
6. Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany
7. Institut für Physik, Universität Rostock, 18051 Rostock, Germany
8. Max-Planck-Institut für die Physik komplexer Systeme, 01187 Dresden, Germany