Thermal Stability of Conduction-Cooled YBCO Pancake Coil
Thermal Stability of Conduction-Cooled YBCO Pancake Coil
复制标题
传导冷却 YBCO 扁平线圈的热稳定性
DOI：
10.1109/tasc.2010.2090122
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发表时间：
2011
影响因子：
1.8
通讯作者：
Y. Ishii
中科院分区：
文献类型：
--
作者：
H. Miyazaki;S. Iwai;T. Tosaka;K. Tasaki;S. Hanai;M. Urata;S. Ioka;Y. Ishii
当高温超导（HTS）线圈使用传导冷却技术运行时，线圈应该用环氧树脂浸渍，因为如果没有环氧树脂，线圈就不能充分冷却。另一方面，重要的是线圈绕组中不应该有损坏区域，因为损坏区域会局部产生热量，最终导致线圈失超。然而，当我们制作了一个浸渍高温超导线圈与YBCO磁带缠绕，并评估其V-I特性，线圈的n值远低于我们的预期，这表明在绕组中的某些区域的临界电流急剧下降。因此，我们已经开始改善浸渍高温超导线圈缠绕YBCO磁带的性能。在本文中，我们调查了退化的原因，发现退化并没有发生，当我们减少在绕组中的径向拉应力。然后，我们制作了四个单饼线圈，堆叠它们，并在传导冷却条件下测试它们。测量的V-I曲线与计算的曲线吻合良好，表明我们成功地开发了一种制备浸渍高温超导线圈的技术与YBCO带材缠绕没有退化。我们还测量了由两个单饼线圈缠绕YBCO带材组成的传导冷却高温超导线圈的热失控电流，并通过使用三维热传导方程数值模拟的热性能，以研究的YBCO线圈的热稳定性。热失控电流的测量值与计算值吻合较好。
When a high-temperature superconducting (HTS) coil is operated using a conduction-cooling technique, the coil should be impregnated with epoxy resin because the coil is not sufficiently cooled without it. On the other hand, it is important that the coil should have no damaged area in the winding because the damaged area would generate heat locally and the coil would eventually quench. However, whenever we fabricated an impregnated HTS coil wound with YBCO tapes and evaluated its V-I characteristics, the n-value of the coil was much lower than we expected, indicating that the critical currents of some areas in the winding drastically decreased. Therefore, we have started to improve the performance of an impregnated HTS coil wound with YBCO tapes. In this paper, we investigated the cause of the degradation and found that the degradation did not occur when we decreased the radial tensile stress in the windings. Then we fabricated four single-pancake coils, stacked them, and tested them in a conduction-cooled condition. The measured V-I curves were in good agreement with the calculated ones, suggesting that we successfully developed a technique of fabricating an impregnated HTS coil wound with YBCO tapes with no degradation. We also measured thermal runaway currents of a conduction-cooled HTS coil composed of two single-pancake coils wound with YBCO tapes and numerically simulated the thermal properties by using a three-dimensional heat conduction equation in order to study the thermal stability of the YBCO coil. The measured thermal runaway currents were in good agreement with the calculated ones.
影响因子：
3.6
作者：
Osamura, Kozo;Sugano, Michinaka;Otto, Alexander
通讯作者：
Otto, Alexander