Design and Implementation of a Mechanical Semipersistent Switch for HTS Magnets

IF 1.7 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-21 DOI:10.1109/TASC.2025.3553635

Timon Käser;Snædís Björgvinsdóttir;Chukun Gao;Pin-Hui Chen;Michael Urban;Ronny Gunzenhauser;Alexander Däpp;Nicholas Alaniva

{"title":"Design and Implementation of a Mechanical Semipersistent Switch for HTS Magnets","authors":"Timon Käser;Snædís Björgvinsdóttir;Chukun Gao;Pin-Hui Chen;Michael Urban;Ronny Gunzenhauser;Alexander Däpp;Nicholas Alaniva","doi":"10.1109/TASC.2025.3553635","DOIUrl":null,"url":null,"abstract":"Persistent-mode operation of superconducting magnets requires a persistent switch, usually a heater, to close their superconducting circuits. Here, we describe a mechanical copper switch that utilizes pressure to vary resistance. This switch is designed to provide a low-resistance short between two high-temperature superconducting (HTS) charging electrodes in an all-HTS pancake-coil magnet. The switch is able to achieve a contact resistance as low as 460 nΩ by pressing gold-coated copper surfaces together at 3.0 kN. At 77 K, with an HTS pancake coil charged to 0.45 T, the magnetic field decayed slowly with the switch closed. The decay fits to a 3.6-µΩ resistance, most of which arises from unrelated insufficient connections within the HTS magnet itself. The design shows the potential of building a persistent-mode superconducting magnet with a mechanical switch, where, as an example, a 30-T magnet with an inductance of 5.9 H has a field drift of −6 ppm/h.","PeriodicalId":13104,"journal":{"name":"IEEE Transactions on Applied Superconductivity","volume":"35 4","pages":"1-5"},"PeriodicalIF":1.7000,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10936986","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Applied Superconductivity","FirstCategoryId":"101","ListUrlMain":"https://ieeexplore.ieee.org/document/10936986/","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

Persistent-mode operation of superconducting magnets requires a persistent switch, usually a heater, to close their superconducting circuits. Here, we describe a mechanical copper switch that utilizes pressure to vary resistance. This switch is designed to provide a low-resistance short between two high-temperature superconducting (HTS) charging electrodes in an all-HTS pancake-coil magnet. The switch is able to achieve a contact resistance as low as 460 nΩ by pressing gold-coated copper surfaces together at 3.0 kN. At 77 K, with an HTS pancake coil charged to 0.45 T, the magnetic field decayed slowly with the switch closed. The decay fits to a 3.6-µΩ resistance, most of which arises from unrelated insufficient connections within the HTS magnet itself. The design shows the potential of building a persistent-mode superconducting magnet with a mechanical switch, where, as an example, a 30-T magnet with an inductance of 5.9 H has a field drift of −6 ppm/h.

查看原文本刊更多论文

高温超导磁体机械半持久开关的设计与实现

超导磁体的持续模式操作需要一个持续开关，通常是一个加热器，来关闭它们的超导电路。在这里，我们描述了一个机械铜开关，利用压力来改变电阻。该开关设计用于在全高温超导（HTS）煎饼线圈磁铁的两个高温超导（HTS）充电电极之间提供低电阻短路。通过在3.0 kN的压力下将镀金的铜表面压在一起，该开关能够实现低至460 nΩ的接触电阻。在77 K时，高温超导煎饼线圈充电至0.45 T，磁场随开关闭合而缓慢衰减。衰减适合3.6µΩ电阻，其中大部分是由HTS磁铁本身内部不相关的连接不足引起的。该设计显示了用机械开关构建持久模式超导磁体的潜力，其中，作为一个例子，电感为5.9 H的30 t磁体的场漂移为- 6 ppm/ H。

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.