1. Institute of Materials, China Academy of Engineering Physics, P.O. Box 9071, Mianyang 621907, People's Republic of China
2. Research Center of Laser Fusion, China Academy of Engineering Physics, P.O. Box 919-986, Mianyang 621900, People's Republic of China
3. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China