Internal Tin Nb3Sn Conductors Engineered for Fusion and Particle Accelerator Applications
Internal Tin Nb3Sn Conductors Engineered for Fusion and Particle Accelerator Applications
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DOI：
10.1109/tasc.2009.2018074
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发表时间：
2009-06-01
影响因子：
1.8
通讯作者：
Goodrich, Loren
中科院分区：
文献类型：
--
作者：
Parrell, Jeff A.;Zhang, Youzhu;Goodrich, Loren
在过去的几年中，Nb 3Sn股线的临界电流密度（J（c））已经显著提高。对于大多数磁体应用，高J（c）内部锡已取代青铜工艺股线。最高的J（c）值是从分布的屏障线获得的。我们继续开发用Nb-47wt%Ti棒制成的股线以提供掺杂剂，并且已经实现了3000 A/mm（2）（12 T，4.2 K）的J（c）值。这样的导线也具有非常好的较高场性能，在15 T下达到1700 A/mm（2）。为了减少这些高J（c）股线中的有效细丝直径，在常规生产中，纳入最终再堆叠坯料中的子元件棒的数量已增加到127个，并在实验217个堆叠上给出了结果。还描述了一种新的用于改善单丝形状的再挤出技术。对于聚变应用，如ITER，我们已经开发出单屏障内部锡股具有超过1100 A/mm（2）（12 T，4.2 K）的非铜J（c）值与滞后损失小于700 mJ/cm（3）在非铜体积。还介绍了这种复合材料的J（c）-应变行为。
The critical current density (J(c)) of Nb3Sn strand has been significantly improved over the last several years. For most magnet applications, high J(c) internal tin has displaced bronze process strand. The highest J(c) values are obtained from distributed barrier strands. We have continued development of strands made with Nb-47wt% Ti rods to supply the dopant, and have achieved J(c) values of 3000 A/mm(2) (12 T, 4.2 K). Such wires have very good higher field performance as well, reaching 1700 A/mm(2) at 15 T. To reduce the effective filament diameter in these high J(c) strands, the number of subelement rods incorporated into the final restack billet has been increased to 127 in routine production, and results are presented on experimental 217 stacks. A new re-extrusion technique for improving the monofilament shape is also described. For fusion applications such as ITER, we have developed single-barrier internal tin strands having non-Cu J(c) values over 1100 A/mm(2) (12 T, 4.2 K) with hysteresis losses less than 700 mJ/cm(3) over non-Cu volume. The J(c)-strain behavior of such composites is also presented.