Yoke geometry study using pulsed field magnetization on superconducting joined bulk Gd-Ba-Cu-O

Abstract

Conditions for obtaining high-quality superconducting joint in Gd-Ba-Cu-O bulk superconductors were investigated, and the effects of PFM properties of the joined bulk and the change of yoke geometry in magnetization were examined. For a good superconducting joint fabricated by the local melting method using sintered Er-Ba-Cu-O, the J c-B property and multiple Hall sensors indicates that the joined part is the preferential field penetration path. PFM was performed using a changed geometry of yoke in which concentrated long pulse to the joined part, but the result was equivalent to the trapped field before the changing yoke because the volume of the yoke was reduced. This is the first attempt to approach an effective PFM method for the joined bulk from the viewpoint of a changed geometry of yoke.