1. National Institute for Fusion Science, Toki, Japan
2. Nagoya University, Department of Energy Engineering and Science, Nagoya, Japan
3. Institute of Plasma Physics, Chinese Academy of Science, Hefei, China
4. Japan Atomic Energy Agency, Naka, Japan
5. Max-Planck Institut für Plasma Physik, Greifswald, Germany
6. Southwestern Institute of Physics, Chengdu, China