Critical current of a Nb3Sn bronze route conductor under uniaxial tensile and transverse compressive stress
Critical current of a Nb3Sn bronze route conductor under uniaxial tensile and transverse compressive stress
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DOI：
10.1088/0953-2048/20/9/s11
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发表时间：
2007-09
影响因子：
3.6
通讯作者：
B. Seeber;A. Ferreira;V. Abächerli;R. Flükiger
中科院分区：
文献类型：
--
作者：
B. Seeber;A. Ferreira;V. Abächerli;R. Flükiger
在轴向和横向载荷作用下，测量了Nb3Sn青铜丝在12 ~ 19 t范围内的临界电流数据。为此，开发了一种新的探头，用于施加横向压缩力，其测量长度为120 mm。该装置是基于一个一圈沃尔特斯弹簧，从而规避了电流转移的问题。该探头允许应用0.01 μ V cm - 1或更小的电压标准，允许对n值进行详细研究。正如预期的那样，导体受横向压应力的影响大于受轴向拉应力的影响。在小的横向应力下，导体已经开始退化，而且退化的速度随着磁场的增加而增加。在目前测量的电线上，从160 MPa卸载后，临界电流恢复到初始值的87%。所得结果鼓励进一步研究不同处理的Nb3Sn超导体（内部锡，管内粉末）或其他（例如Nb3Al），并可能有助于建模。
A complete set of critical current data for a Nb3Sn bronze wire under axial and transverse loads has been measured as a function of magnetic field in the range between 12 and 19 T. For this purpose a new probe was developed for the application of a transverse compressive force with a gauge length of 120 mm. The device is based on a one-turn Walters spring, thus circumventing the problem of current transfer. The probe allows the application of voltage criteria of 0.01 µV cm−1 or less, allowing a detailed study of the n values. As expected, the conductor is more affected by transverse compressive stress than by axial tensile stress. The conductor already starts to degrade at small transverse stresses and the rate of degradation increases with the magnetic field. On the wires measured so far, unloading from 160 MPa yields a recovery of the critical current to 87% of its initial value. The obtained results encourage further investigations of differently processed Nb3Sn superconductors (internal tin, powder in tube) or others (e.g. Nb3Al) and may be helpful for modelling.