Pulsed-field magnetization of drilled bulk high-temperature superconductors: flux front propagation in the volume and on the surface

被引:9
|
作者
Lousberg, Gregory P. [1 ,2 ]
Fagnard, J-F [1 ]
Haanappel, E. [3 ,4 ]
Chaud, X. [5 ]
Ausloos, M. [6 ]
Vanderheyden, B. [1 ]
Vanderbemden, Ph [1 ]
机构
[1] Univ Liege, SUPRATECS Res Grp, Dept Elect Engn & Comp Sci B28, B-4000 Liege, Belgium
[2] LNCMI, Toulouse, France
[3] CNRS, UMR5089, UPS, IPBS, Toulouse, France
[4] Univ Toulouse, UPS, IPBS, Toulouse, France
[5] CNRS, CRETA, Grenoble, France
[6] Univ Liege, SUPRATECS B5A, B-4000 Liege, Belgium
来源
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2009年 / 22卷 / 12期
关键词
CRITICAL-CURRENT-DENSITY; BA-CU-O; HOLES; YBCO;
D O I
10.1088/0953-2048/22/12/125026
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present a method for characterizing the propagation of the magnetic flux in an artificially drilled bulk high-temperature superconductor (HTS) during pulsed-field magnetization. As the magnetic pulse penetrates the cylindrical sample, the magnetic flux density is measured simultaneously in 16 holes by means of microcoils that are placed across the median plane, i.e. at an equal distance from the top and bottom surfaces, and close to the surface of the sample. We discuss the time evolution of the magnetic flux density in the holes during a pulse and measure the time taken by the external magnetic flux to reach each hole. Our data show that the flux front moves faster in the median plane than on the surface when penetrating the sample edge; it then proceeds faster along the surface than in the bulk as it penetrates the sample further. Once the pulse is over, the trapped flux density inside the central hole is found to be about twice as large in the median plane as on the surface. This ratio is confirmed by modelling.
引用
收藏
页数:9
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