1. Frontier Research Institute, Chubu University, Aichi 487-8501, Japan
2. Research Center for Plasma Turbulence, Kyushu University, Fukuoka 816-8580, Japan
3. National Institute for Fusion Science, Gifu 509-5292, Japan
4. Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
5. Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
6. Southwestern Institute of Physics, P. O. Box 432, Chengdu, Sichuan 610041, China
7. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China
8. College of Nuclear Science and Engineer, East China University of Technology, Nanchang 330013, China
9. Department of Innovative Energy Science and Engineering, Graduate School of Engineering, Chubu University, Aichi 487-8501, Japan