Dependence of AC Losses in HTS Coated Conductors With Magnetic Substrates on Tensile Stresses

Abstract

We investigated uni-axial tensile stress dependence of AC losses (transport current, magnetization and total losses) in HTS coated conductor with magnetic Ni-alloy substrate. The AC loss characteristics are studied by relating to tensile stress dependence of critical currents of the conductor. Experimental results showed that the loss characteristics were different whether the critical current recovered the original value after the release of the stress or not. Dependence of AC loss characteristics on magnetic property of the substrate is also studied.Index Terms-AC transport current loss, ferro-magnetic substrate, HoBaCuO conductor, Ni-alloy substrate.

Measurement of magnetic properties of Ni-alloy substrate of HTS coated conductor in LN2

“…In order to study the AC transport current losses in the superconducting (SC) layer and magnetic substrate, respectively, AC transport current losses are analyzed using FEM taking account of both the nonlinear E-J characteristics and the nonlinear magnetic property of the substrate in LN 2 [3], and the numerical results of AC transport current loss are compared with measurement results [1]. Table 1 shows dimensions and electric parameters of the coated conductor [1] for numerical analysis.…”

“…Table 1 shows dimensions and electric parameters of the coated conductor [1] for numerical analysis. The B m -H b curve of the weak magnetic substrate is used.…”

“…However, it has been reported that the magnetic property of the substrate strongly affects the AC transport current losses [1,2]. In the previous study, it was shown that the magnetism of the substrate affects the AC transport current loss using the finite element method (FEM).…”

“…Moreover, the AC transport current losses are analyzed using FEM taking account of both the nonlinear E-J characteristics and the nonlinear magnetic property of the substrate in LN 2 [3] and the numerical results of AC transport current loss are compared with measured results [1].…”

Analysis of Effect of Nonlinear Magnetic Property of Magnetic Substrate on AC Transport Current Loss of HTS Coated Conductor Using FEM

“…The conductivity at the -th iteration is given by (4) where is the conductivity calculated using (3). is the underrelaxation factor .…”