Numerical Simulation of Contactless Methods for Measuring j_C Distribution of High Temperature Superconducting Thin Film

抄録

The inductive method and the permanent magnet method for measuring the critical current density in a high-temperature superconducting (HTS) thin film have been investigated numerically. For this purpose, a numerical code has been developed for analyzing the time evolution of the shielding current density in a HTS sample. The results of computations show that, in the inductive method, the critical current density near the film edge cannot be accurately evaluated. On the other hand, it is found that, in the permanent magnet method, even if the magnet is placed near the film edge, the maximum repulsive force is roughly proportional to the critical current density. This means that the critical current density near the film edge can be estimated from the resulting proportionality constants.