Calibration of Hall sensor array for critical current measurement of YBCO tape with ferromagnetic substrate

Highlight
• A continuous Hall sensor array system has been designed.
• The inhomogeneity of YBCO tape with ferromagnetic substrate can be detected by HAS.
• Finite element method is an effective method for calibrating the remanent field.

HAS (Hall sensor array) is a powerful tool to detect the uniformity of HTS (high temperature superconductor) tape through mapping the distribution of remanent or shielding field along the surface of the tape. However, measurement of HTS tape with ferromagnetic parts by HSA is still an issue because the ferromagnetic substrate has influence on the magnetic field around the HTS layer. In this work, a continuous HSA system has been designed to measure the critical current of the YBCO tape with ferromagnetic substrate. The relationship between the remanent field and critical current was calibrated by the finite element method. The result showed that the HSA is an effective method for evaluating the critical current of the HTS tape with ferromagnetic substrate.