AC loss characteristics of copper-stabilized YBCO coated conductor

Influence of copper layer and mechanical stress-strain on AC losses in copper-stabilized YBCO coated conductor (CC) was investigated. The uni-axial tensile stress-strain was applied to the sample CC in liquid nitrogen at atmospheric pressure, and the AC losses (transport, magnetization and total AC losses) were measured by an electric method. Experimental results showed that the stress-strain dependence of the AC losses can be estimated by knowing stress dependent critical current and magnetization losses in the non-stressed CC. Influence of the copper layer was investigated by measuring frequency dependence of the AC losses. The experimental results showed that there are some influences of the copper layer. However, the influence of the copper layer was not significant from the stand point of practice applications.