1. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
2. China Electric Power Research Institute Co., Ltd., Wuhan 430074, China
3. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
4. Forschungszentrum Jülich GmbH, Institut für Energie-und Klimaforschung-Plasmaphysik, Jülich 52425, Germany