1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3. Sandia National Laboratory, Albuquerque, New Mexico 87185, USA
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