Electromagnetic and Cryogenic Design of a Liquid-Helium-Free 9-T NbTi Magnet for Scanning Tunneling Microscopy

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

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-12 DOI:10.1109/TASC.2025.3569222

Yunxing Song;Jianglan Li;Zhiwen Cheng;Mengyu Liu;Xian Li;Liang Li;Qiuliang Wang

{"title":"Electromagnetic and Cryogenic Design of a Liquid-Helium-Free 9-T NbTi Magnet for Scanning Tunneling Microscopy","authors":"Yunxing Song;Jianglan Li;Zhiwen Cheng;Mengyu Liu;Xian Li;Liang Li;Qiuliang Wang","doi":"10.1109/TASC.2025.3569222","DOIUrl":null,"url":null,"abstract":"The strong magnetic field generated by the superconducting magnet can significantly enhance the capabilities of scanning tunneling microscopy (STM) in exploring novel quantum materials, nano-magnetic systems, and topological materials. A liquid-helium-free 9-T NbTi magnet for STM has been developed at the Wuhan National High Magnetic Field Center and is entirely cooled with a Gifford-McMahon (GM) cryocooler. This magnet features five independent coils, a cold bore diameter of 95 mm, a rated operating current of 80.7 A, and a rated central magnetic field of 9.0 T. The magnetic field uniformity over a 1-cm diameter spherical volume is 0.1%. This article presents the electromagnetic and cryogenic design of the magnet, along with a thermal and mechanical analysis and optimization of the current leads and cooling paths. The optimized magnet system successfully reaches a temperature below 4 K. After six training quenches, the magnet was successfully ramped to and parked at 9.2 T.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 6","pages":"1-7"},"PeriodicalIF":1.8000,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Applied Superconductivity","FirstCategoryId":"101","ListUrlMain":"https://ieeexplore.ieee.org/document/11002410/","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}

引用次数: 0

Abstract

The strong magnetic field generated by the superconducting magnet can significantly enhance the capabilities of scanning tunneling microscopy (STM) in exploring novel quantum materials, nano-magnetic systems, and topological materials. A liquid-helium-free 9-T NbTi magnet for STM has been developed at the Wuhan National High Magnetic Field Center and is entirely cooled with a Gifford-McMahon (GM) cryocooler. This magnet features five independent coils, a cold bore diameter of 95 mm, a rated operating current of 80.7 A, and a rated central magnetic field of 9.0 T. The magnetic field uniformity over a 1-cm diameter spherical volume is 0.1%. This article presents the electromagnetic and cryogenic design of the magnet, along with a thermal and mechanical analysis and optimization of the current leads and cooling paths. The optimized magnet system successfully reaches a temperature below 4 K. After six training quenches, the magnet was successfully ramped to and parked at 9.2 T.

查看原文本刊更多论文

扫描隧道显微镜用无液氦9-T NbTi磁体的电磁和低温设计

超导磁体产生的强磁场可以显著增强扫描隧道显微镜（STM）探索新型量子材料、纳米磁性系统和拓扑材料的能力。武汉国家强磁场中心研制了一种用于STM的无液氦9-T NbTi磁体，该磁体采用Gifford-McMahon （GM）制冷机完全冷却。该磁铁具有5个独立线圈，冷孔直径为95 mm，额定工作电流为80.7 a，额定中心磁场为9.0 t。在直径为1 cm的球形体积上，磁场均匀度为0.1%。本文介绍了磁体的电磁和低温设计，以及对电流引线和冷却路径的热学和力学分析和优化。优化后的磁体系统成功地达到了4 K以下的温度。经过六次训练淬火后，磁体成功地斜坡到并停在9.2 T。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.