摘要
针对NbTi线材绕制的7 T无液氦传导冷却低温超导磁体,利用有限元方法对励磁过程中超导磁体结构材料内部的涡流损耗进行计算;对比不同材料的低温比热容、热导率和电阻率,利用有限元软件对不同结构材料超导磁体励磁过程进行仿真,得到磁体内部的涡流和温度分布以及不同励磁速度对超导绕组温升的影响。结果表明,磁体最大允许励磁速度与结构材料的低温电阻率呈正相关,超导绕组的最高温度随励磁速度线性变化。
Aiming at the 7 T liquid helium-free low-temperature superconducting magnet wound with NbTi wire, the eddy current loss in superconducting magnet during excitation was calculated by finite element method. The low temperature specific heat capacity, thermal conductivity and resistivity of different materials were compared. Finite element software was used to simulate the excitation process of superconducting magnets with different structural materials, and the eddy current and temperature distribution inside the magnets and the influence of different excitation speeds on the temperature rise of superconducting windings were obtained. The results show that the maximum allowable excitation velocity of the magnet is positively correlated with the low temperature resistivity of the structural material, and the maximum temperature of the superconducting winding varies linearly with the excitation velocity.
作者
郝磊鹏
戴银明
程军胜
孙金水
孙万硕
王秋良
Hao Leipeng;Dai Yinming;Cheng Junsheng;Sun Jinshui;Sun Wanshuo;Wang Qiuliang(Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of the Chinese Academy of Science,Beijing 100049,China)
出处
《低温与超导》
CAS
北大核心
2023年第2期7-13,共7页
Cryogenics and Superconductivity
基金
国家重点研发计划(2018YFF0109401)资助。
关键词
NbTi超导磁体
传导冷却
结构材料
有限元分析法
励磁稳定性
NbTi superconducting magnet
Conduction cooling
Structural materials
Finite element method
Excitation stability
