Influence of Current Direction on AC Losses of a Multi-Wire YBCO-NiW Conductor With Horizontal Arrangement

Multi-wire conductors consisting of YBCO wires with magnetic substrate are usually applied in the high temperature superconductor (HTS) applications. In these applications, ac loss is a critical factor to determine the capacity of a refrigerator. And the ac losses of YBCO-NiW wires will be affected by the magnetic substrate. In this work, the self-field loss of the YBCO wire with the magnetic substrate is firstly measured, and compared with the numerical data. Moreover, the ac losses of a multi-wire YBCO-NiW conductor consisting of three wires are investigated for three transport modes. The main results show that the measured self-field loss of the wire is identical with the numerical ones. Accordingly, the reliability of the experimental and numerical methods is verified. Also, the ac losses of the conductor are in good agreement with the numerically calculated losses. As for the multi-wire conductor's total losses, the change of the direction of current in wires will not have an apparent influence on the total ac losses.