液氮浸泡式高性能ReBCO超导带材失超传播特性研究

高性能高温超导带材在大型超导磁体装置上的应用已成为一种趋势,由于存在失超传播速度缓慢、失超检测信号微弱等不足,对失超保护设计提出很大挑战。本文基于液氮浸泡式双保护层的高性能ReBCO带材失超传播特性,采用一维热平衡方程建立失超传播速度的数学模型,通过增加失超源,检测热点温度与电压信号,探究液氮浴环境下的ReBCO带材在传输电流等不同参数下失超传播速度和最小失超能量的变化规律。结果显示:相同条件下,高温超导带材的失超传播速度与传输电流成正相关,最小失超能量与传输电流成负相关,且相比无保护层的普通高温超导带材,具有双保护层的高性能ReBCO临界电流和触发裕度均有提升。

Study on the quench propagation characteristics of liquid nitrogen soaked high performance ReBCO superconducting tape

The application of high-performance high-temperature superconducting tape in large-scale superconducting magnet devices has gradually become a trend, and its slow quenching propagation speed and weak quenching signal are great challenges to quench protection design. In this paper, the research on the quench propagation characteristics of high performance ReBCO strips with double protective layer based on liquid nitrogen immersion was conducted. The mathematical model of quench propagation speed was established based on one-dimensional heat balance equation. By adding the quenching source and detecting the hot spot temperature and voltage signal, the quench propagation characteristics of the one-dimensional scale were investigated, including the variation of the quench propagation velocity and the minimum quench energy of the ReBCO strip with the transmission current.The experimental results show that the quench propagation velocity of the high-temperature superconducting tape is positively correlated with the transmission current, the minimum quench energy is negatively correlated with the transmission current under the same conditions. Moreover, the high-performance ReBCO with double protective layer has higher critical current and trigger margin than ordinary high-temperature superconducting tape without protective layer.