School of Physics;
Harbin Institute of Technology;
Harbin 150001;
People's Republic of China;
Laboratory for Space Environment and Physical Sciences;
Harbin Institute of Technology;
Harbin 150001;
People's Republic of China;
Sino French Institute of Nuclear Engineering and Technology;
Sun Yat sen University;
Zhuhai 519082;
People's Republic of China;
double tearing mode; hybrid-PIC simulation; fast reconnection; secondary islands;