Structural Analysis of High-Temperature Superconductor Winding Based on Stacked in Conduit Conductor Design

The design of the compact fusion device, called K-CPD, is under preliminary design in Korea. One of potential options for the superconducting magnet system in K-CPD is the utilization of high-temperature superconductors (HTS) based on its ability generating higher magnetic fields compared to low-temperature superconductors (LTS). As a preliminary research preceding the K-CPD project, an agreement has been made to develop HTS conductors and an HTS model coil. Among the promising HTS materials, REBCO (Rare-Earth Barium Copper Oxide) tape is widely used in high-field magnet applications, including fusion reactors. However, cabling and twisting with REBCO tape is significantly challenging due to its structural properties. A potential approach to address these challenges is the Stacked in Conduit Conductor (SICC) design, which consists of non-transposed and stacked REBCO tapes; thereby the design and jacketing process of the SICC are currently under evaluation in Korea. To preliminary ensure reliability in the winding process of the SICC for coil fabrication, extensive structural analyses have been conducted with improving our understanding on deformation behaviors. Therefore, this study aims to understanding the deformation behaviors during the winding process of the SICC design and effect of bending radius on the stress-strain distribution and structural variations to provide key insights for improving HTS application in K-CPD coil fabrication.