Design Study on a 100-kA/20-K HTS Cable for Fusion Magnets
Design Study on a 100-kA/20-K HTS Cable for Fusion Magnets
复制标题
DOI：
10.1109/tasc.2014.2371068
复制
发表时间：
2015-06
影响因子：
1.8
通讯作者：
S. Hahn;Jung-Bin Song;Youngjae Kim;K. Han;Haigun Lee;Y. Iwasa;Y. Chu
中科院分区：
文献类型：
--
作者：
S. Hahn;Jung-Bin Song;Youngjae Kim;K. Han;Haigun Lee;Y. Iwasa;Y. Chu
由于高温超导体（HTS）的热稳定性比低温超导体（LTS）高100倍，并且高温超导体能够在无液氦的温度下工作，因此高温超导体电缆被认为是托卡马克的环形场（TF）线圈和寻星器的螺旋线圈等聚变磁体的可能替代品。本文介绍了100 ka /20 k高温超导电缆的初步设计，这可能是聚变磁体的一种选择。利用CryoSoft代码THEA对该电缆的热行为进行了定量分析，并与100 ka /4.2 k Nb3Sn电缆的热行为进行了比较。在本文中，我们证明了“电流共享温度（Tcs）”和“最小淬火能量（MQE）”的传统概念可能不适合设计和分析高温超导电缆。相反，“热失控温度（TR）”和“最小失控能量（MRE）”被证明更有效。同时，将THEA模拟的高温超导电缆的淬火后温升与传统解析z函数方法的模拟结果进行了比较。结果表明，z函数方法被证明对LTS电缆是有效的，但可能会显著高估HTS电缆的淬火后温升。
Due to the > 100 times higher thermal stability of high temperature superconductor (HTS) than that of low temperature superconductor (LTS) and the capability of HTS to be operated at a liquid-helium-free temperature, an HTS cable is being considered a possible alternative to LTS for fusion magnets such as Toroidal Field (TF) coils in Tokamaks, and Helical coils in Stellarators. This paper presents a first-cut design of a 100-kA/20-K HTS cable, which could be an option for fusion magnets. Thermal behaviors of the cable were analyzed and compared quantitatively with those of a 100-kA/4.2-K Nb3Sn cable using the CryoSoft code THEA. In the paper, we demonstrated that the conventional concepts of the “current sharing temperature (Tcs)” and the “minimum quench energy (MQE)” may not be suitable for design and analysis of the HTS cable. Instead, “thermal runaway temperature (TR)” and “minimum runaway energy (MRE)” were proved to be more effective. Also, the post-quench temperature rise of the HTS cable, simulated by the THEA, was compared with that by the conventional analytic Z-function approach. The results demonstrate that the Z-function approach, proven to be effective for an LTS cable, may significantly overestimate the post-quench temperature rise of an HTS cable.