1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030000, China
2. Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fujian Normal University, Fuzhou, Fujian 350117, China
3. Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle (Ministry of Education), School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
4. Analysis and Testing Research Center of Beijing Geological Research Institute of Nuclear Industry, Beijing 100020, China