1. Institute of Plasma Physics Chinese Academy of Sciences, Hefei 230031, China
2. Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230031, China
3. National Institute for Fusion Science, Toki 509-5292, Gifu, Japan
4. School of Electrical and Photoelectronic Engineering, West Anhui University, Luan 237000, China
5. Hefei Keye Electrical Physical Equipment Manufacturing Co., Ltd., Hefei, China
6. Institute of Modern Physics, Fudan University, Shanghai 200433, China
7. Anhui University, Hefei 230601, China