1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2. Atomic Weapons Establishment, Aldermaston, Reading, Berkshire RG7 4PR, United Kingdom
3. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
4. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA