Development of a Small-Size Superconducting Bulk Magnet System Using a 13 K Refrigerator

Author

Yokoyama, K. ; Oka, T. ; Noto, K.

Author_Institution

Dept. of Electr. & Electron. Eng., Ashikaga Inst. of Technol., Tochigi, Japan

Volume

20

Issue

3

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

973

Lastpage

976

Abstract

We developed a small-superconducting bulk magnet system using a 13 K refrigerator. The industrial applications of bulk magnets demand the miniaturization of the magnet apparatus as well as the enhancement of the magnetic field. A Gifford-McMahon cycle helium refrigerator with the ultimate temperature of 13 K at the 2nd stage was adopted, and a bulk material of 60 mm diameter and 20 mm thickness reinforced by a stainless steel ring was located on a cold stage. When a magnetic field of 7.74 T was applied, the trapped field reached 2.76 T, which is the highest ever reported for a pulsed-field magnetization of 60 mm class bulk material.

Keywords

barium compounds; gadolinium compounds; helium; magnetisation; refrigeration; superconducting magnets; GdBa₂Cu₃O_7-x; Gifford-McMahon cycle helium refrigerator; magnetic flux density 7.74 T; miniaturization; pulsed-field magnetization; size 20 mm; stainless steel ring; superconducting bulk magnet system; temperature 13 K; trapped magnetic field; Magnetic field distribution; magnetic separation; pulsed-field magnetization; superconducting bulk magnet;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2041643

Filename

5433295