International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics;
State Key Laboratory of Advanced Electromagnetic Engineering and Technology;
School of Electrical and Electronic Engineering;
Huazhong University of Science and Tech no logy;
Wuhan 430074;
People's Republic of China;
Southwestern Institute of Physics;
Chengdu 610041.People's Republic of China;
Chengdu University;
Chengdu 610106;
People's Republic of China;
Beibu Gulf University;
Qinzhou 535000;
People's Republic of China;