Investigation of Magnetic Properties in Precisely Machined RE-Ba-Cu-O Bulk Superconductors for Use in Undulator Systems

IF 1.8 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2025-09-17 DOI:10.1109/TASC.2025.3611339

Dabin Wei;Yimin Tong;Chan Liu;Zhuangwei Chen;Ya Shi;Difan Zhou;Marco Calvi;Alexandre Arsenault;Kai Zhang;Haixiao Deng

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引用次数: 0

Abstract

A 50-period high-temperature superconducting (HTS) undulator consisting of staggered-array Gd-Ba-Cu-O (GdBCO)/Ag bulks is under development for application at the Shanghai Soft X-ray Free Electron Laser facility. The key fabrication challenges include precision electrical discharge machining of over 100 cylindrical bulks into half-moon shapes, shrink-fitting into copper sleeves, and grinding each assembly to 4 mm thickness, all while preserving superconducting properties. This paper presents the fabrication process and magnetic field mapping results of all completed samples, which were field-cooled and magnetized using a 0.3 T electromagnet at 77 K. Cracked samples were identified and excluded based on their trapped field profiles. The remaining qualified samples were assessed by integrating the trapped magnetic field over a specified area to quantify their superconducting performance, then sorted and positioned in a staggered-array undulator configuration. Simulation results indicate that the magnetic field inhomogeneity can be reduced to 1.9%, a level suitable for further optimization through adjustment of the ferromagnetic pole heights.

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用于波动系统的精密加工RE-Ba-Cu-O块体超导体的磁性研究

由交错排列的Gd-Ba-Cu-O (GdBCO)/Ag块体组成的50周期高温超导（HTS）波动体正在上海软x射线自由电子激光设备上开发应用。关键的制造挑战包括将100多个圆柱形体精密电火花加工成半月形，收缩配合到铜套中，并将每个组件磨削到4毫米厚，同时保持超导性能。本文介绍了所有完成样品的制作过程和磁场测绘结果，这些样品使用0.3 T电磁铁在77 K下进行场冷却和磁化。根据裂缝样品的困场剖面，对其进行了识别和排除。剩余的合格样品通过积分指定区域的捕获磁场来评估，以量化其超导性能，然后将其分类并放置在交错阵列波动器配置中。仿真结果表明，通过调整磁极高度，可以将磁场不均匀性降低到1.9%，这一水平适合进一步优化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.