Study on methods to suppress decay of trapped magnetic field in HTS bulk subjected to AC magnetic field

摘要

It was found in our previous experiment that trapped magnetic field in high temperature superconductor (HTS) bulks are decayed when the bulks are subjected to perturbation of magnetic fields. This phenomenon is inconvenient for the applications of HTS bulks and it is necessary to develop methods to suppress the decay. It was proven also in our previous experiments that the decay is caused by temperature rises of the bulks due to AC losses in the bulks. In the paper, studies on mechanism of the decay are reviewed. Methods to suppress the decay are proposed based on those studies and their effectiveness is experimentally investigated.