15 T高场复合超导磁体低温实验研究

Low temperature experimental study on 15 T high-field hybrid superconducting magnet

大孔径高均匀度高场磁体是进行超导材料性能测试的必要条件之一。本文主要介绍了15 T高场复合超导磁体的低温励磁实验与结果。该磁体包括两个高性能Nb_(3)Sn线圈、一个ITER Nb_(3)Sn线圈和一个NbTi线圈,分别处于磁体的高、中、低场部分。磁体外径329.9 mm,高度401.44 mm,中心孔径77.5 mm,磁体中心磁场测量值14.94 T,轴向磁场(98%)均匀区测量长度55 mm,超过了磁体设计指标要求的40 mm,测试结果满足设计要求。

Large-aperture,high-uniformity and high-field magnets are one of the necessary conditions for performance examination of the superconducting materials.The low-temperature excitation experiments and the results of 15 T high-field hybrid superconducting magnet were mainly presented.The magnet comprised two high-performance Nb_(3)Sn coils,an ITER Nb_(3)Sn coil and a NbTi coil,which were located in the high,medium and low field parts of the magnet.The outer diameter of the magnet was 329.9 mm with the height of 401.44 mm and the inner diameter of 77.5 mm.The tested center magnetic field was 14.94 T,and the axial magnetic field(98%)homogeneity length was 55 mm,which exceeded the requirement of 40 mm.The test results indicate the magnet properties successfully satisfy the design requirements.