1. Institute of Plasma Physics, Chinese Academy
of Sciences, P.O. Box 1126, Hefei, Anhui 230031,
China
2. School of Nuclear Science and Technology,
University of Science and Technology of China, Hefei,
Anhui 230026, China
3. Department of Physics and Astronomy,
University of California, Irvine, California 92697,
USA
4. Diagnostic Team, ITER
Organization, Route de Vinon-sur-Verdon, Saint Paul Lez Durance
13067, France