屏蔽电流对REBCO高场磁体应力应变分布的影响：实验验证与数值分析
Screening current effect on the stress and strain distribution in REBCO high-field magnets: experimental verification and numerical analysis
摘要：
除了屏蔽电流感应磁场（SCIF）外，高温超导涂层导体的屏蔽效应也对其在线圈绕组中的应变分布有很大的影响，特别是在高场运行时。为了证明这一现象，设计了一个特殊的实验装置。使用LTS背景磁体和小型HTS插入线圈，我们能够对10 mm宽的REBCO样品的环向应变进行直接观察。将实测数据与基于T-A公式的电磁模型和均匀力学模型求解的数值解进行了比较，结果表明两者吻合良好。提出了考虑屏蔽效应时最大径向洛伦兹力的解析表达式。使用开发的数值模型，我们进一步研究了两个主要研究的方法，这是以前引入的，以减少SCIF的潜在影响，包括多导体和电流扫描反转（CSR）的方法。
英文摘要：
Besides screening-current-induced magnetic fields (SCIF), the shielding effect in high-Tc coated conductors also has an strong influence on its strain distribution in a coil winding, especially during high-field operations. To demonstrate this phenomenon, a special experimental setup was designed. With an LTS background magnet and a small HTS insert coil, we were able to carry out direct observations on the hoop strains of a 10-mm wide REBCO sample. Measured data was compared against numerical solutions solved by electromagnetic models based on T -A formulation and homogeneous mechanical models, showing good agreements. An analytical expression was proposed to estimate the maximum radial Lorentz force considering shielding effect. Using the developed numerical models, we further studied the potential effects of two of the mostly investigated methods, which were formerly introduced to reduce SCIF, including multi-filamentary conductors and current sweep reversal (CSR) approach.
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