In the last few years, the current density of Bi-2212 wires has been greatly improved by filament densify technologies. One further step toward applications in fusion magnets is to design a high current cable, which must overcome the drawbacks of Bi-2212 wires: brittleness and complex heat treatment process. In this article, react-and-wind flat cables are proposed. With react-and-wind technique, a larger number of choices of jacket and quench protection materials are available including stainless steel and copper, both of which are widely used for Nb3Sn and NbTi superconducting cables but are not directly usable for wind-and-react Bi-2212 cables due to their reaction during heat treatment. Two wires, representing, respectively, modest and top performance of the state-of-the-art wires, are considered. Several cable layouts are studied in terms of dimension, compaction rate, and transverse mechanical pressure. Materials for quench protection and jacket materials are also discussed.

中文翻译：

---

用于聚变磁铁的 50-kA React-and-Win Bi-2212 电缆的设计研究

近年来，Bi-2212 线材的电流密度通过灯丝致密化技术得到了极大的提高。在聚变磁铁中应用的另一个步骤是设计一种高电流电缆，它必须克服 Bi-2212 线的缺点：脆性和复杂的热处理工艺。在本文中，提出了反应缠绕扁平电缆。采用反应缠绕技术，有更多的护套和淬火保护材料可供选择，包括不锈钢和铜，这两种材料都广泛用于Nb3Sn和NbTi超导电缆，但不能直接用于缠绕反应Bi-2212 电缆由于它们在热处理过程中发生反应。考虑了两条线，分别代表最先进线的适度和顶级性能。在尺寸、压实率和横向机械压力方面研究了几种电缆布局。还讨论了淬火保护材料和护套材料。