1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
2. Institute for Fusion Theory and Simulation and Department of Physics Hangzhou, Zhejiang University, Zhejiang 310027, China
3. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
4. Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, China