背景场下CORC线圈的临界电流与传输损耗研究  

Study of critical current and transmission loss of CORC coil under background field

作　　者：吴标航 高曙阳 王昊 乔冠群 羊新胜 Wu Biaohang;Gao Shuyang;Wang Hao;Qiao Guanqun;Yang Xinsheng(School of Physical Science and Technology,Southwest Jiaotong University,Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle,Ministry of Education,Chengdu 610031,China)

机构地区：[1]西南交通大学物理科学与技术学院、磁浮技术与磁浮列车教育部重点实验室,成都610031

出　　处：《低温与超导》2023年第12期39-44,共6页Cryogenics and Superconductivity

基　　金：四川省科技计划(2023YFH0009);国家磁约束核聚变能发展研究专项(2022YFE03150102)资助。

摘　　要：背景磁场会导致CORC线圈临界电流的衰减和传输损耗的增加,进而影响到超导设备运行的稳定及安全。本文通过四引线电测法分别测试了CORC线圈在直流背景场下的临界电流与传输损耗特性。结果表明,CORC线圈在直流背景磁场下的临界电流衰减只与磁场的大小有关,与磁场的方向无关;在不同频率下,CORC线圈在自场以及在直流背景场下的整体传输损耗整体随电流的增大而增加,具体表现为:自场下,损耗与频率依赖性不大;随着直流背景磁场的施加,CORC线圈的传输损耗在高电流强磁场下急剧增加;同时,传输损耗在高电流强磁场下表现出对频率的依赖性,表现为频率越低损耗越高。合理控制CORC线圈的使用的条件,可有效降低传输损耗,保障超导设备的稳定安全运行。The background magnetic field leads to the attenuation of the critical current of the CORC coil and the increase of the transmission loss,which affects the stability and safety of the operation of the superconducting device.In this paper,the critical current and transmission loss characteristics of CORC coils under DC background field were tested by the four-lead electrical measurementmethod,respectively.The results show that the critical current attenuation of CORC coils under DC background magnetic field is only related to the magnitude of the magnetic field,and is independent of the direction of the magnetic field;the overall transmission loss of CORC coils in the self-field as well as in the DC background field increases with the increase of the current as a whole at different frequencies,which is specifically shown in the following way:under the self-field,there is not much dependence of the loss on the frequency;with the imposition of the DC background magnetic field,the transmission loss of the CORC coils increases drastically under the high current-strong magnetic field;at the same time,the transmission loss exhibits the dependence of the frequency under the high-current-strong magnetic field,which is manifested in the fact that the lower the frequency is,the higher the loss becomes.Reasonable control of the conditions of the use of CORC coils can effectively reduce the transmission loss and ensure the stable and safe operation of superconducting equipment.

关 键 词：背景直流磁场 临界电流 传输损耗 

分 类 号：TM26[一般工业技术—材料科学与工程]