Engineering current density in excess of 200 A mm−2 at 20 T in CORC® magnet cables containing RE-Ba2Cu3O7−δ tapes with 38 μm thick substrates
Engineering current density in excess of 200 A mm−2 at 20 T in CORC® magnet cables containing RE-Ba2Cu3O7−δ tapes with 38 μm thick substrates
复制标题
DOI：
10.1088/0953-2048/28/12/124001
复制
发表时间：
2015-10
影响因子：
3.6
通讯作者：
D. C. van der Laan;L. Goodrich;P. Noyes;U. Trociewitz;A. Godeke;D. Abraimov;A. Francis;D. Larbalestier
中科院分区：
文献类型：
--
作者：
D. C. van der Laan;L. Goodrich;P. Noyes;U. Trociewitz;A. Godeke;D. Abraimov;A. Francis;D. Larbalestier
由RE-Ba 2Cu 3 O 7 −δ涂层导体缠绕的圆芯导体（CORC®）电缆目前正在开发用于下一代加速器磁体，因为它们具有高灵活性和高工程电流密度JE的潜力。CORC®电缆以前在7.5 mm直径电缆中在4.2 K和20 T下达到114 A mm−2的JE。加速器磁体需要至少300 A mm−2的电流密度和小至40 mm的电缆弯曲直径，这是迄今为止在50 μm厚衬底上制造的超导带材所不可能实现的。由更薄的基板制成的CORC®电缆可以显著增加JE，并具有更大的灵活性，正如我们在这里用38 μm厚基板的胶带制成的CORC®电缆所展示的那样。与以前手工缠绕的电缆相比，定制的电缆机生产出更高的电缆质量和更好的胶带性能保持。较薄的基板在4.2 K和20 T下的工程电流密度从114 A mm−2增加到216.8 A mm−2，电缆直径从7.5 mm减小到6.0 mm。结果清楚地表明，从具有较薄基底的带缠绕CORC®电缆是提高其电流密度的直接方法，并且具有很大的应用前景加速器磁铁。
Conductor on round core (CORC®) cables wound from RE-Ba2Cu3O7−δ coated conductors are currently being developed for the next generation of accelerator magnets because of their high flexibility and potential for high engineering current densities JE. CORC® cables previously reached JE of 114 A mm−2 at 4.2 K and 20 T in a 7.5 mm diameter cable. Accelerator magnets require a current density of at least 300 A mm−2 and a cable-bending diameter as small as 40 mm, which has so far not been possible with superconducting tapes made on 50 μm thick substrates. CORC® cables made from thinner substrates could have significantly increased JE with greater flexibility as we here demonstrate with a CORC® cable made of tapes with 38 μm thick substrates. A custom cable machine produced higher cable quality and better retention of tape performance compared to previous cables that were wound by hand. The thinner substrate showed an almost twofold increase in engineering current density from 114 A mm−2 to 216.8 A mm−2 at 4.2 K and 20 T, at a reduction in cable diameter from 7.5 mm to 6.0 mm. The results clearly demonstrate that winding CORC® cables from tapes with thinner substrates is a straightforward method for raising their current density and one that shows great promise for use in accelerator magnets.