Dependence of Dynamic Loss on Critical Current and n-value of HTS Coated Conductors

Properties of superconductors, such as critical current and n-value, have a significant impact on their loss characteristics. This impact is essential for the design of superconducting devices and their loss reduction, and therefore need to be thoroughly understood. The dependence of AC loss in high temperature superconductors (HTS) on these properties has been well studied. However, it is still unknown how dynamic loss is affected. This paper is to address this unsolved problem and provide comprehensive analyses through both numerical simulation and experimental measurements. In this paper, HTS coated conductors with a wide range of critical currents and n-values have been extensively studied. Their dynamic losses and resistance under various conditions have been modelled and compared to available experiment measurements. Results clearly show the dependence of dynamic loss and resistance on critical current and n-value. The cases with high current load under strong external magnetic field have been studied as well. All these results show a rapid change of dynamic loss around certain magnetic fields, which we defined to be the “corner field”, Bcor. This paper clearly demonstrates the dependence of dynamic loss and resistance on critical current and n-value, which can be used as a reference for material selection and design optimization.