Magnetic shielding; Bulk superconductors; Magnetic measurements
Abstract :
[en] In this paper we investigate the magnetic shielding of hollow and semi-closed bulk superconducting tubes at 77 K. We first consider the properties of a commercial Bi-2223 tube closed by a disk-shaped cap placed against its extremity. The results are compared with those obtained on a bulk large grain Y-Ba-Cu-O (YBCO) tube produced by buffer-aided top seeded melt growth. In this process, the disk-shaped pellet and the tubular sample are grown together, resulting in a tube naturally closed at one extremity. The field to be shielded is either parallel or perpendicular to the main axis of the tube. The experimental results are compared with the results of finite element numerical modeling carried out either in two dimensions (for the axial configuration) or three dimensions (for the transverse configuration). In the axial configuration, the results show that the shielded volume can be enhanced easily by increasing the thickness of the cap. In the transverse configuration, the results show the critical role played by the superconducting current loops flowing between the tube and the cap for magnetic shielding. If the tube and the cap are separated by a non-superconducting joint or air gap, the presence of a cap leads only to a small improvement of the transverse shielding factor, even for a configuration where the gap between the cap and the tube contains a 90° bend. The cap leads to a significant increase in the transverse shielding when the cap and the tube are naturally grown in the same process, i.e., made of a continuous superconducting material. The experimental results can be reproduced qualitatively by 3-D numerical modeling.
Research Center/Unit :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Wéra, Laurent; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore)
Fagnard, Jean-François ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore)
Hogan, Kevin; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore)
Vanderheyden, Benoît ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Namburi, Devendra Kumar; University of Cambridge > Department of Engineering > Bulk Superconductivity Group
Shi, Yunhua; University of Cambridge > Department of Engineering > Bulk Superconductivity Group
Cardwell, David; University of Cambridge > Department of Engineering > Bulk Superconductivity Group
Vanderbemden, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
Magnetic shielding of open and semi-closed bulk superconductor tubes: the role of a cap
Publication date :
April 2019
Journal title :
IEEE Transactions on Applied Superconductivity
ISSN :
1051-8223
Publisher :
Institute of Electrical and Electronics Engineers, United States - New York
FWB - Fédération Wallonie-Bruxelles FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture EPSRC - Engineering and Physical Sciences Research Council
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