Pulsed field magnetization properties for Gd–Ba–Cu–O superconductors impregnated with Bi–Sn–Cd alloy

✍ Scribed by Y. Kimura; H. Matsumoto; H. Fukai; N. Sakai; I. Hirabayashi; M. Izumi; M. Murakami

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 251 KB
• Volume: 445-448
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2006.04.027

✦ Synopsis

We present a post-fabrication treatment that improves thermal conductivity of bulk Gd-Ba-Cu-O magnets for pulsed field magnetization (PFM). A small hole about 1 mm in diameter was artificially drilled into the center of bulk Gd-Ba-Cu-O 25 mm in diameter and 18 mm in thickness. An aluminum wire was inserted into the hole, and then the sample was subjected to the impregnation by using Bi-Sn-Cd alloy. We employed PFM to magnetize Gd-Ba-Cu-O bulk superconductors with and without the alloy impregnation treatment. The temperatures of the samples were monitored with thermocouples, and local magnetic field density was measured with a Hall sensor. It was found that the alloy impregnation was effective in suppressing the temperature rise by 4 K and in increasing the trapped field by 25% at 44 K. The present results show that the alloy impregnation treatment enhanced the thermal conductivity of bulk Gd-Ba-Cu-O, and thereby improved the field trapping ability.