1. General Atomics, San Diego, California 92121, USA
2. University of Chicago, Chicago, Illinois 60637, USA
3. Laboratoire pour l’utilisation des lasers intenses, 91128 Palaiseau Cedex, France
4. University of Michigan, Ann Arbor, Michigan 48109, USA
5. Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
6. Technische Universität Dresden, 01062 Dresden, Germany
7. National Research Nuclear University, Moscow 115409, Russia
8. Centre lasers intenses et applications, 33405 Talence Cedex, France