Screening current induced magnetic field and stress in ultra-high-field magnets using REBCO coated conductors
Screening current induced magnetic field and stress in ultra-high-field magnets using REBCO coated conductors
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DOI：
10.1088/1361-6668/ac392b
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发表时间：
2021-11
影响因子：
3.6
通讯作者：
Yufan Yan;Yi Li;T. Qu
中科院分区：
文献类型：
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作者：
Yufan Yan;Yi Li;T. Qu
稀土基氧化钡铜 (REBCO) 涂层导体由于其高现场性能、工程电流密度、拉伸强度和商业可用性，是开发超高场 (UHF) 磁体的有前途的候选材料。然而，与大屏蔽电流相关的技术挑战仍然存在。 UHF应用中REBCO导体中的屏蔽电流引起的主要问题涉及两个方面：屏蔽电流感应磁场（SCF）和屏蔽电流感应应力（SCS）。在过去的几十年里，人们对 SCF 进行了广泛的研究，提供了各种可能的补救措施。随着 UHF 磁体构造和测试的最新进展，涉及 REBCO 线圈的 SCF 的新观察结果被报道。南海问题是近年来被发现的，并引起了越来越多的关注。源于高磁场和屏蔽电流的过度且高度集中的洛伦兹力对 REBCO 涂层导体的机械强度构成威胁。本文的目的是回顾最近在理解和解决当前筛选相关技术问题方面的研究工作。对于SCF，我们重点关注高场实验的最新观察结果及其各种缓解方法。对于 SCS，我们介绍了最新的研究，包括实验特征、数值模型和可能的对策。精确预测大型高温超导磁体中的 SCS 仍然是一个悬而未决的问题。如何最大限度地减少SCF和SCS的影响是未来UHF磁体设计的关键技术挑战之一。
Rare-earth-based barium copper oxide (REBCO) coated conductors are promising candidates for the development of ultra-high-field (UHF) magnets, due to its high in-field performance, engineering current density, tensile strength and commercial availability. However, technological challenges pertaining to the large screening currents still remain. The major issues caused by the screening currents in REBCO conductors in UHF applications involve two aspects: the screening current induced magnetic field (SCF), and the screening current induced stress (SCS). In the past decades, extensive research has been devoted to the SCF, offering a variety of possible remedies. With latest advances in the construction and testing of UHF magnets, new observations of the SCF involving REBCO coils were reported. The SCS was identified in recent years and has raised growing concerns. The excessive and highly concentrated Lorentz force, rooted in the high magnetic field and the screening currents, poses threats to the mechanical strength of REBCO coated conductors. The aim of this paper is to review recent research efforts in understanding and tackling the screening current related technological issues. For the SCF, we focus on the latest observations in high-field experiments and its various mitigation methods. For the SCS, we present recent studies including experimental characterizations, numerical modelling and possible countermeasures. It is still an open question to precisely predict the SCS in large-scale HTS magnets. How to minimize the influence of SCF and SCS is one of the key technical challenges for the design of future UHF magnets.