1. Institute of Plasma Physics, Chinese Academy of Sciences, P. O. Box 1126, Hefei, Anhui 230031, China
2. General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
3. Princeton Plasma Physics Laboratory, P. O. Box 451, Princeton, New Jersey 08543, USA
4. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
5. University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
6. Lawrence Livermore National Laboratory, Livermore, California 94551, USA