The results presented in this Letter describe the successful test of the first high-temperature superconducting multi-tesla insert solenoid tested at currents exceeding 4 kA while operating in a background magnetic field of a low-temperature superconducting outsert magnet. A 45-turn insert solenoid, wound from 19 meters of CORC® cable, was designed to operate at high current, high current density, and high hoop stress in high magnetic background field; a combination that is essential in the development of low-inductance, high-field magnets. The CORC® cable insert solenoid was successfully tested in liquid helium in background magnetic fields of up to 14 T, resulting in a combined central magnetic field of 15.86 T and a peak magnetic field on the conductor of 16.77 T at a critical current of 4,404 A, a winding current density of 169 A/mm2, an engineering current density of 282 A/mm2, and a JBr source stress of 275 MPa. Stable operation of the CORC® cable insert magnet in its superconducting transition was demonstrated, during charging at rates of 20 – 50 A/s, without inducing a quench. The results are a clear demonstration of the major benefits of this multi-tape CORC® magnet conductor in which current sharing between tapes is possible, thereby removing some of the stringent conductor requirements of single-tape magnets. The CORC® cable insert solenoid demonstrated operation at about 86 % of the expected CORC® cable performance and showed no significant degradation after 16 high-current test cycles in background fields ranging from 10 to 14 T. CORC® cables have matured into practical and reliable high-field magnet conductors, achieving important high current, high current density, stress tolerance, and quench protection milestones for high field magnet technology. They have established a straightforward path towards low-inductance magnets that operate at magnetic fields exceeding 20 T.

中文翻译：

---

CORC ^®电缆插入螺线管：第一个高温超导插入磁铁在 14 T 背景磁场中以超过 4 kA 的电流进行测试

本信函中介绍的结果描述了第一个高温超导多特斯拉插入螺线管的成功测试，该螺线管在低温超导插入磁铁的背景磁场中运行时，在超过 4 kA 的电流下进行了测试。由 19 米长的 CORC® 电缆缠绕而成的 45 匝插入式螺线管设计用于在高磁场背景场中以高电流、高电流密度和高环向应力运行；这种组合对于开发低电感、高场磁体至关重要。CORC® 电缆插入螺线管在高达 14 T 的背景磁场中的液氦中成功进行了测试，在 4,404 A 的临界电流下产生了 15.86 T 的组合中心磁场和 16.77 T 的导体峰值磁场，绕组电流密度为 169 A/mm2，工程电流密度为 282 A/mm2，JBr 源应力为 275 MPa。在以 20 – 50 A/s 的速率充电期间，CORC® 电缆插入磁体在其超导过渡中的稳定运行得到了证明，不会引起失超。结果清楚地证明了这种多带 CORC® 磁体导体的主要优点，其中可以在带之间共享电流，从而消除了单带磁体对导体的一些严格要求。CORC® 电缆插入螺线管在 86 % 的预期 CORC® 电缆性能下运行，并且在 10 至 14 T 的背景场中进行 16 次高电流测试循环后没有显示出明显的性能下降。 CORC® 电缆已成熟为实用和可靠高场磁导体，实现重要的高电流、高电流密度，高磁场磁体技术的应力耐受性和失超保护里程碑。他们已经为在超过 20 T 的磁场中运行的低电感磁体建立了一条简单的途径。