Scaling law for the strain dependence of the critical current in an advanced ITER Nb3Sn strand
Scaling law for the strain dependence of the critical current in an advanced ITER Nb3Sn strand
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DOI：
10.1088/0953-2048/20/3/013
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发表时间：
2007-03-01
影响因子：
3.6
通讯作者：
Krooshoop, E.
中科院分区：
文献类型：
--
作者：
Ilyin, Y.;Nijhuis, A.;Krooshoop, E.
测量了一条Nb3Sn超导链上的临界电流，该链将用于ITER（国际热核实验反应堆）管道内电缆导体原型。在最近开发的一种名为Pacman的弹簧装置上对该链进行了表征，该装置允许测量Nb3Sn链在广泛的轴向应变、磁场、温度和至少700 a的电流下的电压-电流特性。在4 ~ 11 T的磁场、4.2 ~ 10 K的温度和-0.9%（压缩）~ +0.3%（拉伸）的轴向应变条件下测量。然后，根据所谓的“改进”偏差应变模型，使用临界电流推导出超导和变形相关参数，用于测量结果的缩放。我们还证明了相同的值可以从部分临界电流数据集导出，而不会破坏整体缩放精度。这表明所提出的尺度关系不仅可以作为一种拟合工具，而且有望用于可靠的外推，为实验常规提供大量的成本和时间节省。
Measurements have been made of the critical current on an Nb3Sn superconducting strand destined for the ITER ( International Thermonuclear Experimental Reactor) prototype cable-in-conduit conductors. Characterization of the strand was performed on a recently developed spring device, named Pacman, allowing measurements of the voltage-current characteristic of an Nb3Sn strand over a wide range of applied axial strain, magnetic field, temperature and currents up to at least 700 A. The strand was measured in a magnetic field between 4 and 11 T, temperatures of 4.2-10 K and applied axial strain ranged from -0.9% (compressive) to +0.3% ( tensile). The critical currents were then used to derive the superconducting and the deformation-related parameters for the scaling of measured results, based on the so-called 'improved' deviatoric strain model. We also demonstrate that the same values can be derived from a partial critical-current data set without spoiling the overall scaling accuracy. This indicates that the proposed scaling relation can be used not only as a fitting tool, but is promising for reliable extrapolation as well, providing substantial savings in cost and time for the experimental routine.