Cu Stabilized $\hbox{Nb}_{3}\hbox{Al}$ Strands for the High Field Accelerator Magnet
Cu Stabilized $\hbox{Nb}_{3}\hbox{Al}$ Strands for the High Field Accelerator Magnet
复制标题
用于高场加速器磁体的 Cu 稳定 $hbox{Nb}_{3}hbox{Al}$ 股线
DOI：
10.1109/tasc.2008.921944
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发表时间：
2008
影响因子：
1.8
通讯作者：
A. Zlobin
中科院分区：
文献类型：
--
作者：
A. Kikuchi;R. Yamada;E. Barzi;M. Lamm;T. Takeuchi;D. Turrioni;A. Zlobin
介绍了用RHQT工艺研制的Nb_3Al线材的特点。采用离子镀和电镀相结合的方法，经济地制备了一根1/4长的铜稳定Nb 3Al圆股线。在5 m/h的高速电镀条件下，成功地实现了电镀铜。实现了铜和前体之间的强结合，并且机械轧制试验没有显示铜稳定剂与前体的分离。轧制后的Nb_3Al股线在临界电流密度和RRR值上均未出现劣化。磁不稳定性在4.2 K，在低场明显改善的F3股，相对于以前的F1的立场，因为钽被用于丝间矩阵的前体。在F1股中观察到的大磁通跳跃在4.2K时被抑制，尽管在低于3.0K时再次出现。扭转股线被证明是有效的，以减少时间相关的涡流耦合。在捻距为45 mm的F3股上获得48 μ m的Deff。此外，在4.2 K和12 T下对F1 Nb 3Al股进行横向压力测试。当横向压力达到210 MPa时，临界电流没有降低.
Characteristics of developed Nb3Al strand though the RHQT (rapid heating/quenching and transformation) process are described. One kilometer-long copper stabilized Nb3Al round strands were economically fabricated with ion-plating and electroplating. The copper electroplating was successfully done with the high velocity of 5 m/h. A strong bonding between the copper and the precursor was achieved, and the mechanical rolling test did not show the separation of the copper stabilizer from the precursor. The rolled Nb3Al strands showed no degradation both in critical current density and RRR value. Magnetic instability at 4.2 K at low fields was apparently improved on the F3 strand, relative to the previously F1 stand because a tantalum was used for the interfilament matrix of precursor. The large magnetic flux jumps, which were observed with the Fl strand, were suppressed at 4.2 K, although appeared again below 3.0 K. The twisted strands are shown to be effective to reduce the time-dependent eddy current coupling. It was obtained 48 mum of Deff on F3 strand with twist pitch of 45 mm. In addition, the transverse pressure test for the Fl Nb3Al strand was performed at 4.2 K and 12 T. The critical current did not degrade with the transverse pressure up to 210 MPa.