Affiliation: | Yen Fei1,2,3,Li Jing1,Zheng Shijun1,Jiang Donghui1,Liu Lu1,Liu Wei1,Ma Guangtong1,Wang Jiasu1,Wang Suyu1,3 1 Applied Superconductivity Laboratory,Southwest Jiaotong University,Chengdu 610031,China,2 State Key Laboratory of Traction Power,3 National Laboratory for Rail Transit |