1. Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
2. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, People's Republic of China
3. Southwestern Institute of Physics, Chengdu 610041, People's Republic of China