基于高温超导带材特性测量的跑道型磁体设计

Design of racetrack background magnetic field based on HTS characteristics measurement

随着超导材料应用逐渐广泛,对于超导带材在背景磁场下交流损耗及临界电流等特性的研究也日趋重要。为满足高纵横比的长高温超导带材特性测量实验要求,本文对跑道型背景磁体进行了研究设计。首先本文对跑道型亥姆霍兹线圈进行空间磁场理论分析,利用Matlab数值模拟计算出磁体尺寸最优参数,并通过COMSOL Multiphysics5. 3软件仿真验证参数最优性。同时改变线圈电流,观察磁场范围大小及其均匀度的变化。通过仿真证明,跑道型亥姆霍兹线圈能产生更大范围均匀磁场,且通过改变输入线圈的电流大小可改变其磁场强度。

With the increasing application of superconducting materials,the research on the AC loss and critical current characteristics of superconductor tapes under background magnetic field is more important.In order to measure the characteristics of long high temperature superconducting tapes with high aspect ratio,the racetrack magnets were studied in this paper.At first, the numerical calculation of racetrack Helmholtz coils was accomplished.The optimum parameters of the magnet size were calcu- lated by Madab and tested by COMSOL simulation.Meanwhile,change of magnetic field size and homogeneity were observed set- ting up different current.It is proved by simulation that the racetrack Helmholtz coil can produce a wider uniform magnetic field, and the different magnetic field strength can be obtained by changing the current.