2G HTS Coil Technology Development at SuperPower
2G HTS Coil Technology Development at SuperPower
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DOI：
10.1109/tasc.2012.2233837
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发表时间：
2013-06-01
影响因子：
1.8
通讯作者：
Hazelton, Drew
中科院分区：
文献类型：
--
作者：
Song, Honghai;Brownsey, Paul;Hazelton, Drew
第二代高温超导体（2G HTS），Re-Ba-Cu-O涂层导体以其强的机械性能而闻名，在强磁场研究和电力系统中具有许多潜在的应用。在社区中已经注意到，当用于环氧树脂浸渍的磁体绕组时，涂层导体在热循环时可能易于性能退化。这种降解与导丝的c轴剥离强度有关。SuperPower正在通过开发导体后处理和线圈缠绕技术的新技术的短期方法来解决这个问题，该技术允许使用电流生成导体构建高质量线圈，以及改善电线生产的长期方法，以构建具有高c轴剥离强度的更强电线。本文将重点介绍正在进行的短期开发工作。SuperPower从2G高温超导线圈缠绕的报告技术中学习，并在此基础上展示线圈缠绕技术，以制造高质量的2G高温超导线圈。多个双饼线圈（DPC）成功地缠绕采用薄释放层和不锈钢共缠绕与部分环氧树脂浸渍技术。DPC在多个热循环下缓慢冷却至77 K，并测试临界电流。预期的I-c和良好的n值的可重复测试结果表明，所采用的技术能够使用电流生成导体。我们还简要回顾了一些关键因素，包括2G高温超导磁体线圈内拼接电阻，层绕磁体的发展，和替代绝缘。
The second-generation high-temperature superconductor (2G HTS), Re-Ba-Cu-O coated conductors are known for strong mechanical properties and have numerous potential applications in high magnetic field research and electrical power systems. It has been noted in the community that coated conductors can be prone to performance degradation on thermal cycling when used in epoxy impregnated magnet windings. This degradation has been tied to the c-axis peel strength in the wire. SuperPower is addressing this issue with a short term approach of developing novel technologies in conductor post processing and coil winding technology, which allows building high quality coils with current generation conductor, and a longer term approach of improving wire production to build stronger wire with high c-axis peel strength. This paper will focus on the on-going short-term development work. SuperPower has learned from reported techniques in 2G HTS coil winding and built on them to demonstrate coil winding technology to fabricate high quality 2G HTS coils. Multiple double pancake coils (DPCs) were successfully wound employing a thin release layer and stainless-steel co-winding with a partial epoxy impregnation technique. The DPCs are slow cooled under multiple thermal cycles to 77 K and tested for critical current. Repeatable test results of expected I-c and good n value indicate that techniques employed are able to use current generation conductors. We also briefly review a few key factors related to 2G HTS magnets including in-coil splice resistance, layer wound magnet development, and alternative insulation.