Zhou You-He, Park Dongkeun, Iwasa Yukikazu
Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, Lanzhou University, Lanzhou 730000, China.
Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China.
Natl Sci Rev. 2023 Jan 6;10(3):nwad001. doi: 10.1093/nsr/nwad001. eCollection 2023 Mar.
The development of modern science and technology requires high magnetic fields exceeding 25T. Second-generation high-temperature superconducting wires, i.e. REBCO (REBaCuO-x, RE refers to Y, Gd, Dy, Eu and other rare-earth elements) coated conductors (CCs), have become the first choice for high-field magnet construction because of their high irreversible magnetic field. The mechanical stresses caused by manufacturing, thermal mismatch and Lorenz forces closely influence electromagnetic performance during operation for REBCO CCs. In addition, the recently studied screen currents have effects on the mechanical characteristics of high-field REBCO magnets. In this review, the experimental and main theoretical works on critical current degradation, delamination and fatigue, and shear investigations on REBCO CCs, are reviewed at first. Then, research progress on the screening-current effect in the development of high-field superconducting magnets is introduced. Finally, the key mechanical problems facing the future development of high-field magnets based on REBCO CCs are prospected.
现代科学技术的发展需要超过25T的高磁场。第二代高温超导线材，即稀土钡铜氧（REBaCuO-x，RE指钇、钆、镝、铕等稀土元素）涂层导体（CCs），因其高不可逆磁场而成为高场磁体构建的首选。制造过程中产生的机械应力、热失配和洛伦兹力在REBCO CCs运行期间会密切影响其电磁性能。此外，最近研究的屏蔽电流对高场REBCO磁体的机械特性也有影响。在这篇综述中，首先回顾了关于REBCO CCs临界电流退化、分层和疲劳以及剪切方面的实验和主要理论工作。然后，介绍了高场超导磁体开发中屏蔽电流效应的研究进展。最后，展望了基于REBCO CCs的高场磁体未来发展面临的关键机械问题。
