15 T Nb3Sn磁体热处理传热分析及实验研究

Heat transfer analysis and experiment on heat treatment of 15 T high-field hybrid superconducting magnet

大孔径高场磁体是开展超导材料性能研究的必要装置。依托聚变堆主机关键系统综合研究设施项目,中科院等离子体物理研究所将进行15 T高场复合超导磁体研制,磁体高场区由Nb_(3)Sn密绕线圈构成。热处理是Nb_(3)Sn线圈研制的关键工艺环节也是磁体研制的难点,要求磁体热处理温度均匀性优于±5℃。针对15 T Nb_(3)Sn密绕线圈热处理需求,研制了一套真空磁体热处理系统。利用该系统完成了线圈热处理实验,通过传热仿真与实验结果分析,线圈整体温度均匀性优于±3℃,最终各项指标均满足热处理技术要求。

Large aperture high-field magnets are necessary devices for the study of the properties of superconducting materials. Based on the Comprehensive Research Facility for FusionTechnology(CRAFT) project, the Institute of plasma physics, Chinese Academy of Sciences(ASIPP) will develop a 15 T high field composite superconducting tightly wound magnet, and the magnet high field area is composed of Nb;Sn coils. Heat treatment is the key process in the development of Nb;Sn coil and the difficulty of magnet development, which requires the temperature uniformity of magnet heat treatment to be better than ±5 °C. In view of the heat treatment requirements of 15 T Nb;Sn tight winding coil, a vacuum magnet heat treatment system was developed. The system was used to complete the coil heat treatment experiment, through the heat transfer simulation and experimental result analysis, the overall temperature uniformity of the coil is better than ±3 °C, and the final indicators meet the technical requirements of heat treatment.