Various strand concept for high-temperature superconductor (HTS) flat tapes have been developed in the past few years for fusion magnet applications. We developed a round HTS strand with soldered multilayer copper tapes as filler and support called SaMiT following the technic path of twisted stacked-tape cable. DC tests performed under bending and twisting condition demonstrated that the proposed design of the HTS strand is promising in the high current cable and magnet application, but the study on electromechanical properties against the transverse and cyclic load is still needed. A press device was designed to measure the critical current of SaMiT sample at 77 K and self-field as a function of transverse and cyclic load to simulate the electromagnetic force load during the magnet operation. Transverse load amplitudes have been applied up to 40 MPa and cyclic load up to 1000 cycles at certain load amplitude. The experimental results are presented and structural optimization suggestions are discussed with visual inspection and analysis.

中文翻译：

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使用 ReBCO 胶带的 HTS 圆股在横向和循环载荷下的临界电流特性

在过去几年中，已经开发出用于高温超导体 (HTS) 扁平带的各种绞合线概念，用于聚变磁体应用。我们开发了一种圆形 HTS 绞线，采用焊接多层铜带作为填充物和支撑物，称为 SaMiT，遵循双绞堆叠带电缆的技术路径。在弯曲和扭曲条件下进行的直流测试表明，所提出的 HTS 绞线设计在大电流电缆和磁铁应用中很有前景，但仍需要研究抵抗横向和循环载荷的机电性能。设计了一个压力装置来测量 SaMiT 样品在 77 K 下的临界电流和作为横向和循环载荷的函数的自场，以模拟磁铁运行过程中的电磁力载荷。横向载荷幅值已施加至 40 MPa，循环载荷在特定载荷幅值下可施加至 1000 次循环。给出了实验结果，并通过目视检查和分析讨论了结构优化建议。