Nb3Sn/Cu复合导体分流温度的定量计算

摘要

铌三锡是高磁场下实用的一种低温超导材料,分流温度是超导磁体的关键设计参数.文中采用超导体幂指数模型,定量计算了绝热条件下柱状铌三锡复合导体的分流温度,计算结果与现有的分流温度估算公式结果相符；另外还分别讨论了幂指数模型的中的指数n以及磁场对铌三锡复合导体分流温度的影响.结果可以为无液氦直接冷却系统中超导磁体的相关低温技术研究提供一定的数据参考.%Nb3Sn is a practical low - temperature superconducting material in the high magnetic field, and current - sharing temperature is the key design parameter for superconducting magnet. Based on the power - law model of superconductor, the current - sharing temperatures for Nb3 Sn/Cu composite conductor was simulated, the result had agreement with the existing equation ones. Moreover, the effects of n - value in the power - law model and magnetic filed on current - sharing temperature were also discussed. This paper will provide reference for cryogenic refrigerating and cool conducting technology especially without liquid helium.