Effect of Iron yoke geometry on pulse field magnetization behavior of superconducting jointed Gd-Ba-Cu-O bulk superconductor

Dec. 1 14:10-14:25

*Kento Takemura1, Kimiaki Sudo1, Rémi Dorget2, Longji Dadiel1, Masaki Sakafuji1, Kazuya Yokoyama3, Tetsuo Oka1, Naomichi Sakai1
Shibaura Institute of Technology 3-7-5 Toyosu, koto-Ku, Tokyo 135-8548, Japan1
Université de Lorraine, GREEN, 54000 Nancy, France2
Ashikaga University, 286-1 Omae-cho, Ashikaga-Shi, Tochigi 326-8558, Japan3

We have fabricated a superconducting jointed Gd-Ba-Cu-O bulk superconductor by employing the local melting method and investigated the effect on pulse field magnetization (PFM) behavior. In this study, we will report the effect of the iron yoke geometry which placed on the coil side during PFM on the magnetization behavior.

It is possible to fabricate a high-quality superconducting jointed Gd-Ba-Cu-O bulk superconductor by employing the local melting method with a Er-Ba-Cu-O superconducting thin plate having a slightly lower melting point. The superconductor joint method enables the fabrication of larger bulk and complex shapes, which have been difficult to achieve in the past.

The PFM method has an advantage that the magnetization in an equipment is possible, compared to the field cooling magnetization method in a magnetic field. However, in case of PFM method, it is difficult to obtain a high trapping magnetic field due to the heat generation caused by rapid magnetic flux motion during PFM. Therefore, we have suggested that controlling the Jc-B property of the superconducting jointed part may disperse the heat generated during PFM and improve the efficiency of pulse magnetization. Here, Yokoyama et al. reported that the possibility of improving the trapped magnetic field of a bulk superconductor with defects by changing the shape of the iron yoke during PFM [IEEE Trans. Appl. Supercond., 2020].

In this study, we apply this technique to a superconducting jointed Gd-Ba-Cu-O bulk superconductor and report the effects of changing the width and orientation of the iron yoke on the magnetizing properties during PFM.

Keywords: Bulk superconductor, Superconductor Joint, Pulse magnetization, Trapped magnetic field