In recent years, remarkable progresses have been made in the R&D efforts for high temperature superconducting (HTS) high-field magnets. The screening-current-induced magnetic field and mechanical stress/strain in rare-earth barium-copper-oxide (REBCO) coils are raising growing concerns. This paper presents experimental and theoretical analyses on the effects of screening-current-induced mechanical strains in a REBCO insert setup without transport currents. Strain measurements on two REBCO coils, with and without over-banding structures, were carried out in an low temperature superconducting (LTS) background field magnet. Electromagnetic-mechanical models were developed, coupling the tilting angles of the superconducting tapes and the strain dependency of the critical current. The discrete-coupled model with turn-to-turn contacts, the discrete-sequential model and the block model were implemented and compared against the measured hoop strains. Combining experimental data with simulation models, it is shown that moderate over-banding structures are effective in providing reinforcements for the superconductors. A new method of edge-bonding was proposed and tested, which could reduce hoop strains in low applied fields but failed in higher fields. This work could be useful for the design and analysis of future high-field REBCO magnets.

近年来，高温超导（HTS）高场磁体的研发工作取得了显着进展。稀土钡铜氧化物 (REBCO) 线圈中的屏蔽电流感应磁场和机械应力/应变引起了越来越多的关注。本文对屏蔽电流引起的机械应变在没有传输电流的 REBCO 插入装置中的影响进行了实验和理论分析。在低温超导 (LTS) 背景场磁体中对具有和不具有超带结构的两个 REBCO 线圈进行应变测量。开发了电磁机械模型，将超导带的倾斜角和临界电流的应变相关性耦合起来。具有匝间触点的离散耦合模型，离散序列模型和块模型被实施并与测量的箍应变进行比较。将实验数据与仿真模型相结合，表明适度的超带结构在为超导体提供增强方面是有效的。提出并测试了一种新的边缘粘合方法，该方法可以在低应用领域减少环向应变，但在高领域失败。这项工作可能有助于设计和分析未来的高场 REBCO 磁铁。这可以减少低应用领域的环应变，但在更高的领域失败。这项工作可能有助于设计和分析未来的高场 REBCO 磁铁。这可以减少低应用领域的环应变，但在更高的领域失败。这项工作可能有助于设计和分析未来的高场 REBCO 磁铁。