1. Institute of Plasma Physics Chinese Academy of Sciences, Hefei, China
2. National Institute for Fusion Science, Toki, Gifu, Japan
3. School of Electrical and Photoelectronic Engineering, West Anhui University, Lu’an, China
4. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian, China