Design and Preliminary Test at 77 K of a 5 T / 34 mm REBCO Dipole Magnet Insert for a 15 T Full-Service-Field Testing Facility

IF 1.7 3区 物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Ziyang Xu;Peng Song;Mingzhi Guan;Yulong Liu;Canjie Xin;Mianjun Xiao;Liangjun Shao;Timing Qu
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Abstract

A new testing facility employing a 15 T transverse field to evaluate the full-service-field characteristics of superconducting materials is now under development in China. A primary objective involves producing a large bore 15 T dipole magnet to serve as the source of the transverse magnetic field load. In this study, we designed and constructed a compact high-temperature superconducting (HTS) dipole magnet insert, comprising six block-type double pancake (DP) coils wound with REBCO tapes. The insert features a user bore of 34 mm and an outer diameter of 110 mm, expected to generate a 5 T field at 4.2 K with an operating current of 278 A, within a 10 T low-temperature superconducting (LTS) background dipole magnet. According to numerical simulations, the sextupole coefficient $b_{\mathrm{3}}$ is less than $5\times 10^{-3}$ and the operating point $I_{\text{op}}/I_{\mathrm{c}}$ is below 0.6 considering the screening current. Circumferential reinforcement structures were externally integrated to the REBCO coil assembly to mitigate electromagnetic stress under high background fields. The magnet was successfully charged to 43 A, achieving a central field of 0.71 T at 77 K, validating the winding process and joint techniques. The no-insulation characteristics were analyzed based on the test data. This work is important for advancing practical high-field HTS dipole magnets with high stability and field uniformity.
15t全服务现场测试设施中5t / 34mm REBCO偶极磁铁插入件在77k下的设计和初步测试
中国正在开发一种新的测试设备,该设备采用15t横向场来评估超导材料的全服务场特性。主要目标包括生产一个大口径15t偶极磁铁作为横向磁场负载的来源。在这项研究中,我们设计并构建了一个紧凑的高温超导(HTS)偶极子磁铁插入体,由六个用REBCO胶带缠绕的块状双煎饼(DP)线圈组成。该插入件的用户孔为34毫米,外径为110毫米,预计在10 T低温超导(LTS)背景偶极磁铁内,在4.2 K下产生5 T的磁场,工作电流为278 a。根据数值模拟,考虑筛分电流,六极子系数$b_{\ mathm{3}}$小于$5\ × 10^{-3}$,作动点$I_{\text{op}}/I_{\ mathm {c}}$小于0.6。环形加固结构外部集成到REBCO线圈组件,以减轻高背景场下的电磁应力。磁体成功充电至43 A,在77 K时获得0.71 T的中心磁场,验证了绕组工艺和连接技术。根据试验数据,分析了其无绝缘特性。这一工作对研制具有高稳定性和场均匀性的实用化高场高温超导偶极磁体具有重要意义。
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来源期刊
IEEE Transactions on Applied Superconductivity
IEEE Transactions on Applied Superconductivity 工程技术-工程:电子与电气
CiteScore
3.50
自引率
33.30%
发文量
650
审稿时长
2.3 months
期刊介绍: IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.
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