1. School of Instrumentation and Optoelectronics Engineering, Beihang University, Beijing, China
2. School of Instrumentation and Optoelectronics Engineering, Institute of Large-Scale Scientific Facility, and the Center for Zero Magnetic Field Science, Beihang University, Beijing, China
3. Zhejiang Engineering Research Center of Precision Electromagnetic Control Technology and Equipment and Ningbo Institute of Technology, Beihang University, Ningbo, China