1. State Key Laboratory of Power System and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing, China
2. Institute of Energy, Hefei Comprehensive National Science Center, Hefei, China
3. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China
4. Paul C. Lauterbur Imaging Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China