Dynamic response of HTS composite tapes to pulsed currents

TL;DR

This study investigates the dynamic voltage-current behavior of HTS composite tapes under pulsed currents through experiments and modeling, revealing hysteresis effects and the influence of measurement location on critical current determination.

Contribution

It introduces a combined experimental and theoretical approach to analyze the dynamic response of HTS tapes, emphasizing the impact of measurement setup on observed characteristics.

Findings

Hysteresis loops depend on potential tap location.

Dynamic critical current differs from DC measurements.

Numerical model aligns well with experimental data.

Abstract

Dynamic voltage-current characteristics of an HTS Ag/BiSCCO composite tape are studied both experimentally and theoretically. The tape is subjected by pulsed currents with different shapes and magnitude and voltage traces are measured using the four-point method with different location of potential taps on the sample surface. Clockwise and anticlockwise hysteresis loops are obtained for the same sample depending on location of the potential taps. The dynamic characteristics deviate substantially from the DC characteristic, especially in the range of low voltages where a criterion for the critical current value is usually chosen (1-10 mkV/cm). The critical current determined from dynamic characteristics and its change with the pulse magnitude depend on location of the potential taps and on the curve branch chosen for the critical current determination (ascending or descending). The theoretical analysis is based on a model of the magnetic flux diffusion into a composite tape for a superconductor described by the flux creep characteristic. Numerical simulation based on this model gives the results in good agreement with the experimental ones and explains the observed peculiarities of the dynamic characteristics of HTS composite tapes. The difference between the magnetic diffusion into a tape and a slab is discussed.