We report recent developments in the scale-up of symmetric RE -Ba-Cu-O ( RE BCO) tapes with 15–22 μ m thick substrates. Using these symmetric RE BCO tapes, we fabricated up to 10 m long, symmetric tape round (STAR™) RE BCO wires, less than 2 mm diameter, using 1.02 mm and 0.81 mm diameter copper formers. The critical current of the long STAR™ wires made in lengths of 2–10 m ranges from 465 A to 564 A at 77 K, self-field. This wire was then used to construct a single-layer, full-depth groove, three-turn canted cosine theta (CCT) coil with a minimum bend radius of 15 mm. This three-turn CCT coil retains 95% of its I c even when wound at a such a small bend radius. This result confirms the capability of fabricating CCT coils with STAR™ wire at a tilt angle of 30º which would yield a dipole transfer function of 0.48 T kA −1 at a 15 mm bend radius. Further, the architecture of STAR™ wire was modified for an I c

中文翻译：

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用于倾斜余弦θ线圈的RE BCO STAR™焊丝按比例放大的进展以及具有更高灵活性的未来策略

我们报道了具有15–22μm厚基底的对称RE -Ba-Cu-O（RE BCO）胶带的规模化发展的最新进展。使用这些对称的RE BCO胶带，我们使用直径为1.02 mm和0.81 mm的铜成型机制造了长达10 m的对称圆形圆形（STAR™）RE BCO导线，直径小于2 mm。在77 K自电场下，长度为2–10 m的STAR™长电线的临界电流范围为465 A至564A。然后，使用该导线构造最小弯曲半径为15 mm的单层，全深度凹槽，三匝斜余弦θ（CCT）线圈。即使以如此小的弯曲半径缠绕，该三匝CCT线圈仍可保留其95％的I c。该结果证实了用STAR™导线以30º倾斜角制造CCT线圈的能力，该弯曲角在15 mm的弯曲半径下将产生0.48 T kA -1的偶极传递函数。