1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2. Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
3. Laboratory for Laser Energetics, Rochester, New York 14623, USA
4. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
5. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
6. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
7. Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637, USA