NbTi CICC导体横向机械性能分析

超导导体的力学性能是决定导体载流性能的重要影响因素之一,构成超导磁体的超导电缆在运行过程中受电磁力、热应力的作用,会导致其内部超导线产生应变,进而影响其载流性能和交流损耗,因此研究电磁循环载荷对超导电缆的影响有着重要的意义。对国际热核聚变实验堆中极向场线圈中Nb Ti超导导体进行机械压缩实验,并从形变量、弹性模量、弹性功等方面,对其机械强度进行分析。该方法可以在不进行电磁循环测试的情况下快速判断导体机械性能,为导体设计提供初步性能评判依据。结果显示,PF1-6NbTi超导导体相对于测试的其他PF导体在相同工况下,累积形变量与最大形变量更小。通过进一步对导体结构设计进行对比分析,发现低空隙率以及短节距绞线可以有效提高电缆机械性能。

Analysis of transverse mechanical properties of NbTi CICC conductors

The mechanical properties of superconducting conductors are one of the important factors affecting the current transport performance of conductor. The superconducting cables in superconducting magnets are subjected to the Lorentz force and thermal stress during operation, which will cause strain on the superconducting wires and performance degradation. Therefore, it is significance to study the transverse mechanical properties of superconducting conductors. The mechanical compression of NbTi superconducting conductor in the polar field coils of ITER was carried out and studied by the deformation, elastic modulus and elastic strain energy. The results show that the PF1 - 6 NbTi superconducting conductor has a smaller cumulative shape and maxi mum shape variable under the same conditions than the other PF conductors tested. By further analyzing the conductor structure de sign, it is found that the low void fraction and the short twist pitch can effectively improve the mechanical properties of the cable.