Correlation between strand stability and magnet performance
Correlation between strand stability and magnet performance
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线股稳定性与磁体性能之间的相关性
DOI：
10.1109/tasc.2005.849155
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发表时间：
2005
影响因子：
1.8
通讯作者：
R. Scanlan
中科院分区：
文献类型：
--
作者：
D. Dietderich;S. Bartlett;S. Caspi;P. Ferracin;S. Gourlay;H. Higley;A. Lietzke;S. Mattafirri;A. Mcinturff;G. Sabbi;R. Scanlan
BNL、LBNL和FNAL的磁体项目已经观察到高J/sub c/ Nb/sub 3/Sn股线和由这些股线制成的磁体的不稳定性。本文将从短样品链测试确定的链稳定性与观察到的磁体性能相关联。已经观察到，当样品电流固定并且磁场倾斜时，在高场（大于10 T）下承载高电流的股线不能在低场（1-3 T）下维持这些相同的电流。这表明，目前这一代的股是易受通量跳跃（FJ）。为了防止通量跳跃限制支架性能，必须适应通量跳跃期间释放的能量。为了更好地理解FJ，这项工作集中在具有给定子元件直径的导线上，并表明可以通过增加铜的导电率（Cu的更高的剩余电阻率比，RRR）来显著提高稳定性。这种增加的稳定性显著改善了导体性能，并允许其承载更多的电流。
Magnet programs at BNL, LBNL and FNAL have observed instabilities in high J/sub c/ Nb/sub 3/Sn strands and magnets made from these strands. This paper correlates the strand stability determined from a short sample-strand test to the observed magnet performance. It has been observed that strands that carry high currents at high fields (greater than 10 T) cannot sustain these same currents at low fields (1-3 T) when the sample current is fixed and the magnetic field is ramped. This suggests that the present generation of strand is susceptible to flux jumps (FJ). To prevent flux jumps from limiting stand performance, one must accommodate the energy released during a flux jump. To better understand FJ this work has focused on wire with a given sub-element diameter and shows that one can significantly improve stability by increasing the copper conductivity (higher residual resistivity ratio, RRR, of the Cu). This increased stability significantly improves the conductor performance and permits it to carry more current.