1. Department of Physics and Astronomy, University of California Irvine, California 92697, USA
2. Fusion Simulation Center, Peking University, Beijing 100871, China
3. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China
4. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
5. Department of Physics, Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, China
6. Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08540, USA
7. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA