In recent years, the applications of high-field REBa₂CuO_y (REBCO) coils have remarkably progressed towards NMR MRIs, accelerators, and other such devices. In a REBCO coil, the magnetic field due to the screening current is generated in the direction opposite to the field by the transport current, thus reducing the magnetic field, deteriorating the field homogeneity, and affecting the time stability of the magnetic field. Recently, the additional force and stress due to the screening current (referred to as screening-current-induced stress) has become a topic of concern. The screening current results in non-uniform current distributions in the REBCO tape. Therefore, the distribution of electromagnetic force in REBCO coils differs from that during the designing of the coil, assuming that the current flow in the tape is uniform. Thus, there is the possibility that the existence of screening current is a serious problem in the mechanical design of REBCO coils. In this study, we evaluate the electromagnetic force and stress due to the screening current by using the developed numerical simulation code for the electromagnetics and stress. We discuss the winding tension, thermal and electromagnetic stresses, and mechanical strength structure of the REBCO coil.

近年来，高场REBa ₂ CuO _y的应用（REBCO）线圈在NMR MRI，加速器和其他此类设备方面已取得了显着进展。在REBCO线圈中，由于屏蔽电流而产生的磁场通过传输电流在与磁场相反的方向上产生，从而减小了磁场，恶化了磁场的均匀性，并影响了磁场的时间稳定性。近来，由于屏蔽电流引起的附加力和应力（称为屏蔽电流引起的应力）已经成为关注的话题。屏蔽电流导致REBCO胶带中的电流分布不均匀。因此，假设带中的电流均匀，REBCO线圈中电磁力的分布与线圈设计期间的电磁力分布不同。因此，在REBCO线圈的机械设计中，存在屏蔽电流是一个严重的问题。在这项研究中，我们通过使用开发的电磁和应力数值模拟代码来评估由于屏蔽电流而产生的电磁力和应力。我们讨论了REBCO线圈的绕组张力，热应力和电磁应力以及机械强度结构。