焊接高温超导叠型电缆电流分布的研究

Study on current distribution in YBCO soldered stacked tapes

第二代高温超导带材具有较好的电磁特性和机械性能,在未来高场螺线管磁体和高场加速器磁体等领域具有极大的发展潜力。通过测量焊接高温超导叠型电缆在液氮温度自场下,临界电流测量值与电压抽头位置的关系,以研究电缆内部电流分布。实验结果表明,当电流逐渐增大时,电缆内部沿堆叠方向不同位置,电压数值不同,说明电缆内部电流非均匀分布,靠近电流引线侧的超导带材输送的电流较多,焊接高温超导叠型电缆的失超判断与电压抽头的位置有着紧密关系。

The second generation HTS tapes have good electromagnetic and mechanical properties, and have also great development potential in the fields of high field solenoid magnet and high field accelerator magnet. The research of the HTS cables has great influence on the development of large HTS magnet. In this paper, the relationship between the critical current and the position of voltage tap was studied. The experimental results show that when the current increases gradually, the voltage values are different at different position in the cable, which shows that the current in the cable is not evenly distributed. The superconducting tape near the current lead carries more current, so the position of the voltage tap has an important influence on the determination of quench of soldered HTS stacked cable.