1. School of Physics and Optoelectronics, Xiangtan University, Hunan 411105, China
2. Institute of High Energy Physics, Chinese Academy of Science (CAS), Beijing 100049, China
3. Spallation Neutron Source Science Center (SNSSC), Dongguan 523803, China
4. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China