Reference : Magnetic shielding of open and semi-closed bulk superconductor tubes: the role of a cap
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Materials science & engineering
Engineering, computing & technology : Electrical & electronics engineering
http://hdl.handle.net/2268/233037
Magnetic shielding of open and semi-closed bulk superconductor tubes: the role of a cap
English
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 mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Apr-2019
IEEE Transactions on Applied Superconductivity
Institute of Electrical and Electronics Engineers
29
3
6801109
Yes (verified by ORBi)
International
1051-8223
NY
[en] Magnetic shielding ; Bulk superconductors ; Magnetic measurements
[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.
Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Communauté française de Belgique - CfB ; Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA ; EPSRC
Researchers ; Professionals
http://hdl.handle.net/2268/233037
10.1109/TASC.2019.2891897
https://ieeexplore.ieee.org/document/8610099
© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
08610099.pdfPublisher postprint2.9 MBRequest copy
Open access
Wera_etal_IEEE_Trans_Appl_Supercond_29_6801109_2019.pdfAuthor postprint3.2 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.