Magnetization loss in multi-slot stacked HTS conductors with different spacings between tapes

Multi-slot stacked high-temperature superconductors (HTS) possess extremely high engineering critical current density and isotropy, allowing them to endure rapid changes in magnetic flux and providing strong mechanical stability. This gives the conductor the potential to be used in the fabrication of superconducting fusion magnets. This paper measures the magnetization AC loss of multi-slot stacked conductors from the perspective of the spacing between tapes and whether they are insulated. Additionally, simulations are conducted using the T-A equation. The results from measurements and simulations are compared to study the effects of tape spacing and inter-layer coupling on magnetization AC loss. Increased spacing between the superconducting tapes facilitates enhanced penetration of external magnetic flux. Consequently, the magnetization AC loss rises significantly with larger spacing between superconducting layers. Although coupling loss constitutes a component of total AC loss, the current homogenization induced by coupling currents may reduce the total AC loss in certain regimes through the coupling effect.