Study on optimization of YBCO thin film stack for compact NMR magnets

被引:12
|
作者
Kim, S. B. [1 ]
Kimoto, T. [1 ]
Hahn, S. [2 ]
Iwasa, Y. [2 ]
Voccio, J. [2 ]
Tomita, M. [3 ]
机构
[1] Okayama Univ, Grad Sch Nat Sci & Technol, Kita Ku, Okayama 7008530, Japan
[2] MIT, Francis Bitter Magnet Lab, Cambridge, MA 02139 USA
[3] Railway Tech Res Inst, Appl Superconduct Mat Tech Div, Kokubunji, Tokyo 1858540, Japan
来源
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2013年 / 484卷
关键词
Compact NMR magnet; YBCO thin films; Stacking methods; Field homogeneity; Trapped fields; COATED CONDUCTOR;
D O I
10.1016/j.physc.2012.02.042
中图分类号
O59 [应用物理学];
学科分类号
摘要
A compact high temperature superconducting (HTS) magnet, which consists of a stack of 500 HTS thin film annuli, was constructed and tested. Each thin film annulus, manufactured by the AMSC using the Rolling Assisted Bi-axially Textured Substrate (RABiTS) method, has a square cross-section of 40 mm x 40 mm with a thickness of 80 m. It has a 25-mm center hole created by machining. This paper reports a study on the anisotropic J(c) issue due to the rolling procedure of the Ni substrate direction and its impact on field homogeneity. Also, three different stacking methods with rotation angles of 22.5 degrees, 90 degrees, and 0 degrees against the rolling direction have been tested to study their impacts on strength, spatial homogeneity, and temporal stability of trapped fields. Finally, the 500-annulus magnet was tested at 21 K under a cryogen-free environment using a GM cryocooler. The spatial field homogeneity and temporal stability were measured at 21 K and compared with those obtained in a bath of liquid nitrogen at 77 K. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:295 / 299
页数:5
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