1. CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom
2. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
3. Department of Earth and Space Science, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
4. Donghua University, Shanghai, China
5. National Fusion Research Institute, KSTAR Research Center 169-148, Daejeon, South Korea
6. Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543-0451, USA
7. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, China
8. Max Planck Institute for Plasma Physics, Garching, Germany
9. General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
10. Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
11. Dalian University of Technology, Dalian 116024, China