1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3. Dipartimento SBAI, Università di Roma “La Sapienza” and CNISM, Via A. Scarpa 14-16, I-00161 Roma, Italy
4. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
5. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
6. General Atomics, San Diego, California 92186, USA