We performed a feasibility study on a high-strength Bi2-x Pb x Sr2Ca2Cu3O10-x (Bi-2223) tape conductor for high-field solenoid applications. The investigated conductor, DI-BSCCO Type HT-XX, is a pre-production version of Type HT-NX, which has recently become available from Sumitomo Electric Industries (SEI). It is based on their DI-BSCCO Type H tape, but laminated with a high-strength Ni-alloy. We used stress-strain characterizations, single- and double-bend tests, easy- and hard-way bent coil-turns at various radii, straight and helical samples in up to 31.2 T background field, and small 20-turn coils in up to 17 T background field to systematically determine the electro-mechanical limits in magnet-relevant conditions. In longitudinal tensile tests at 77 K, we found critical stress- and strain-levels of 516 MPa and 0.57%, respectively. In three decidedly different experiments we detected an amplification of the allowable strain with a combination of pure bending and Lorentz loading to ≥ 0.92% (calculated elastically at the outer tape edge). This significant strain level, and the fact that it is multi-filamentary conductor and available in the reacted and insulated state, makes DI-BSCCO HT-NX highly suitable for very high-field solenoids, for which high current densities and therefore high loads are required to retain manageable magnet dimensions.

中文翻译：

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高磁场电磁阀用高强度 Bi-2223 导体的可行性研究


我们对用于高场电磁阀应用的高强度 Bi2-x Pb x Sr2Ca2Cu3O10-x (Bi-2223) 带状导体进行了可行性研究。所研究的导体 DI-BSCCO HT-XX 型是 HT-NX 型的预生产版本，该型号最近已从住友电气工业 (SEI) 上市。它基于 DI-BSCCO H 型胶带，但采用高强度镍合金层压而成。我们使用了应力应变表征、单弯和双弯测试、各种半径的简单和困难弯曲线圈匝数、高达 31.2 T 背景场的直形和螺旋形样品以及高达 31.2 T 背景场的小型 20 匝线圈。 17 T 背景场可系统地确定磁体相关条件下的机电限制。在 77 K 的纵向拉伸试验中，我们发现临界应力和应变水平分别为 516 MPa 和 0.57%。在三个截然不同的实验中，我们检测到纯弯曲和洛伦兹载荷相结合的许用应变放大到 ≥ 0.92%（在外带边缘弹性计算）。这种显着的应变水平，以及它是多丝导体并可在反应和绝缘状态下使用的事实，使得 DI-BSCCO HT-NX 非常适合非常高磁场的螺线管，对于这种螺线管，需要高电流密度和高负载。需要保持可管理的磁铁尺寸。