1. Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
2. Science Island Branch, Graduate School of University of Science and Technology of China, Hefei 230026, China
3. Hefei Normal University, Hefei 230601, China
4. Anhui Spectreation Instrument Co. Ltd., Hefei 230088, China
5. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
6. School of Electrical Engineering, University of South China, Hengyang 420001, China
7. School of Physics, Dalian University of Technology, Dalian 116024, China
8. Southwestern Jiaotong University, Chengdu 610031, China