Progress in the Development and Construction of a 32-T Superconducting Magnet
Progress in the Development and Construction of a 32-T Superconducting Magnet
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DOI：
10.1109/tasc.2016.2517022
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发表时间：
2016-01
影响因子：
1.8
通讯作者：
H. Weijers;W. Markiewicz;A. Gavrilin;A. Voran;Y. Viouchkov;S. Gundlach;P. Noyes;D. Abraimov
中科院分区：
文献类型：
--
作者：
H. Weijers;W. Markiewicz;A. Gavrilin;A. Voran;Y. Viouchkov;S. Gundlach;P. Noyes;D. Abraimov
32-T超导磁体被设想为15-T低温超导体（LTS）磁体，其与单独供电的REBCO高温超导体（HTS）插入件组合，该插入件被配置为产生17 T的两个线圈堆叠。在该项目的所有方面都取得了进展，并在本工作中报告。的设计概念，这是相当稳定的，以及从最近的发展，如增加电压隔离要求的关键要素。在NHMFL的工厂测试和安装中，牛津仪器制造的15 T/250 mm孔径外磁体符合所有规格，包括1小时至满场的斜坡时间。测试方案包括故意诱导全场淬火，释放7 MJ。在氦水平恢复后，磁体在1小时内再次斜升到全磁场，证明完全恢复。在正常操作和淬火过程中的氦蒸发，以及淬火过程中的电流和场衰减进行了观察。后者的信息作为一个数字淬火代码专门开发的耦合LTS-HTS线圈模型淬火的许多输入。从32-T淬火分析和淬火保护的影响的结果进行了总结。所有高温超导导体长度都经过广泛的质量保证（QA）协议，SuperPower现在已经交付了所有符合规格的导体长度。QA数据及其影响的摘要。原型线圈在设计上与32-T REBCO线圈非常相似，但高度降低，现在已经用石蜡浸渍，以解决先前测试中观察到的绕组运动。原型测试方案包括在实际15 T LTS外部磁体提供的恒定背景场（32 T）和外部磁体被故意淬火的情况下，HTS线圈中淬火加热器有效性的研究。
The 32-T superconducting magnet is envisioned as a 15-T low-temperature superconductor (LTS) magnet combined with a separately powered REBCO high-temperature superconductor (HTS) insert configured as two coil stacks generating 17 T. Progress was made in all aspects of this project and is reported in this work. The design concept, which has been quite stable, is presented, as well as key elements from recent developments such as increased voltage standoff requirements. In both factory testing and installation at the NHMFL, the 15-T/250-mm-bore outer magnet built by Oxford Instruments met all specifications, including a ramp time of 1 h to full field. The test protocol included a deliberately induced full-field quench, releasing 7 MJ. After the helium level recovered, the magnet was ramped again in 1 h to full field, demonstrating full recovery. Helium boiloffs during normal operation and quench were observed, as well as the current and field decay during quench. The latter information serves as one of many inputs for the numerical quench code developed specifically to model quench in coupled LTS-HTS coils. Results from the 32-T quench analysis and implications for quench protection are summarized. All HTS conductor lengths were subjected to an extensive quality assurance (QA) protocol, and SuperPower has now delivered all required conductor lengths within specifications. A summary of the QA data and its implications are presented. The prototype coils, which are very similar in design to the 32-T REBCO coils but of reduced height, have now been impregnated with paraffin to address winding motion observed in previous testing. The prototype test protocol includes a study of the effectiveness of the quench heaters in the HTS coils in both a constant background field as provided by the actual 15-T LTS outer magnet for 32 T and, uniquely, in case the outer magnet is deliberately quenched.