提高（RE）BaCuO带材正常区传播速度的焦耳损耗的空间调制
Spatial modulation of Joule losses to increase the normal zone propagation velocity in (RE)BaCuO tapes
摘要：
本文提出了一种提高柔性金属衬底上生长的（RE）BaCuO薄膜（也称为超导带材）正常区传播速度的简单方法。这种方法背后的关键思想是使用围绕超导带材的银热稳定剂的特定几何形状。更具体地，在超导体层的顶部沉积非常薄的银稳定剂层，通常小于100 nm，而剩余的稳定剂（仍然是银）沉积在衬底侧。正常区的传播速度高达170厘米/秒的实验测量，对应于20纳米的超导体层的顶部上的稳定剂的厚度。这比实际商用磁带上测量的速度快一个数量级。我们的研究结果清楚地表明，一个非常薄的超导层顶部的稳定剂导致高正常区传播速度。实验值与有限元模拟实现的预测吻合良好。此外，在淬火过程中的正常区的传播记录在原位和实时使用高速摄像机。由于在带材样品的两个边缘上产生的高焦耳损耗，在超导区和正常区之间的边界处可以观察到“U形”轮廓，这与模拟预测的轮廓非常接近。
英文摘要：
This paper presents a simple approach to increase the normal zone propagation velocity in (RE)BaCuO thin films grown on a flexible metallic substrate, also called superconducting tapes. The key idea behind this approach is to use a specific geometry of the silver thermal stabilizer that surrounds the superconducting tape. More specifically, a very thin layer of silver stabilizer is deposited on top of the superconductor layer, typically less than 100 nm, while the remaining stabilizer (still silver) is deposited on the substrate side. Normal zone propagation velocities up to 170 cm/s have been measured experimentally, corresponding to a stabilizer thickness of 20 nm on top of the superconductor layer. This is one order of magnitude faster than the speed measured on actual commercial tapes. Our results clearly demonstrate that a very thin stabilizer on top of the superconductor layer leads to high normal zone propagation velocities. The experimental values are in good agreement with predictions realized by finite element simulations. Furthermore, the propagation of the normal zone during the quench was recorded in situ and in real time using a high-speed camera. Due to high Joule losses generated on both edges of the tape sample, a "U-shaped" profile could be observed at the boundaries between the superconducting and the normal zones, which matches very closely the profile predicted by the simulations.
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