A high temperature superconducting (HTS) demonstration coil has been developed in the frame of the Experimental Physics department Research and Development program at CERN The magnet extends the recent experimental demonstration of aluminium-stabilised HTS conductors and supports the development of future large scale detector magnets. The HTS magnet has five turns and an open bore diameter of 230 mm. Up to 30 K, the coil was measured to be fully superconducting across four central turns at 4.4 kA, the maximum available current of existing power supply. The central magnetic field is 0.113 T, the peak field on the conductor is 1.2 T and the coil has a stored magnetic energy of 0.1 kJ. A 3D-printed aluminium alloy (Al10SiMg) cylinder acts both as a stabiliser and a mechanical support for the superconductor. The resistivity of Al10SiMg was measured at cryogenic temperatures, and has a residual resistivity ratio of approximately 2.5. The ability to solder ReBCO tapes (a stack of four REBCO tapes, 4 mm wide, Fujikura) to Al10SiMg stabiliser, electroplated with copper and tin, forming a coil, is demonstrated using tin-lead solder at 188 ^∘C. The HTS magnet was proven to be stable when superconductivity was broken locally using a thin-film heater. Despite voids in the solder joint between HTS and stabiliser, no degradation of the magnet’s performance was observed after 12 thermal cycles and locally quenching the magnet. A numerical model of the transient behaviour of solenoid with partially shorted turns is developed and validated against measurements. Our work experimentally and numerically validates that using an aluminium alloy as a stabiliser for HTS tapes can result in a stable, lightweight and transparent magnet.

中文翻译：

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用于粒子探测器的自保护高温超导演示磁体


欧洲核子研究中心实验物理系研究与开发计划的框架内开发了高温超导（HTS）演示线圈。该磁体扩展了最近铝稳定 HTS 导体的实验演示，并支持未来大型探测器磁体的开发。 HTS 磁体有五匝，开孔直径为 230 毫米。在高达 30 K 的温度下，经测量，线圈在四个中心匝上完全超导，电流为 4.4 kA，这是现有电源的最大可用电流。中心磁场为0.113 T，导体上的峰值磁场为1.2 T，线圈存储的磁能为0.1 kJ。 3D 打印铝合金 (Al10SiMg) 圆柱体既充当超导体的稳定器又充当机械支撑。 Al10SiMg 的电阻率是在低温下测量的，残余电阻率比约为 2.5。使用锡铅焊料在 188 ^∘ 下演示了将 ReBCO 胶带（一叠四片 REBCO 胶带，4 毫米宽，Fujikura）焊接到电镀铜和锡的 Al10SiMg 稳定器上，形成线圈的能力 ^∘ C. 事实证明，当使用薄膜加热器局部破坏超导性时，高温超导磁体是稳定的。尽管高温超导和稳定器之间的焊点存在空隙，但在 12 次热循环和局部淬火磁体后，没有观察到磁体性能下降。开发了具有部分短路匝的螺线管瞬态行为的数值模型，并根据测量进行了验证。我们的工作通过实验和数值验证，使用铝合金作为高温超导带的稳定剂可以生产出稳定、轻质且透明的磁体。