1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester New York 14623, USA
2. Department of Mechanical Engineering, University of Rochester, Rochester New York 14623, USA
3. Lawrence Livermore National Laboratory, Livermore, California 94551, USA
4. Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada
5. CEA, DAM, DIF, F-91297 Arpajon Cedex, France
6. Department of Physics and Astronomy, University of Rochester, Rochester New York 14623, USA