Dependence of the ac loss on interval and stacking number in z stacked gdbco coated conductor

The 2G High-Tc superconductor-coated conductors (2G HTS CC) with large aspect ratios have large AC losses for a perpendicular external magnetic field. A reduction of the AC loss is an important issue in 2G HTS CC applications. In a previous study, stacking of HTS CC was found to increase the full penetration field Hp and to decrease the AC loss. The AC loss for the maximum applied magnetic field Hm below Hp was affected by the interval D and the staking number n. In this study, to reduce the AC loss, we stacked GdBCO-coated conductors with the same geometries and with regular D, and we measured the magnetization curves of the stacked samples at a temperature of 83 K (t = T/Tc = 0:88). The AC losses were calculated using the experimental results, and the AC losses of the stacked samples were compared with phose for the single-layer sample. We investigated the dependences on D and n of the AC losses of the stacked GdBCO CCs. As the interval decreases, the volume normalized AC loss decreased. In the case of D = 0.10 mm, the AC loss was decreased by 16% and 37% in the 2-layer structure and the 3-layer structure, respectively, compared with the 1-layer structure.