1. Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
3. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
4. Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA
5. Fusion Science Center for Extreme States of Matter, University of Rochester, Rochester, New York 14623, USA
6. Space Science Center, University of New Hampshire, Durham, New Hampshire 03824, USA