Article (Scientific journals)
Magnetic shielding properties of high-temperature superconducting tubes subjected to axial fields
Denis, Samuel; Dusoulier, Laurent; Dirickx, Michel et al.
2007In Superconductor Science and Technology, 20 (3), p. 192-201
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Keywords :
magnetic shielding; superconductivity; magnetic measurements
Abstract :
[en] We have experimentally studied the magnetic shielding properties of a cylindrical shell of BiPbSrCaCuO subjected to low frequency AC axial magnetic fields. The magnetic response has been investigated as a function of the dimensions of the tube, the magnitude of the applied field and the frequency. These results are explained quantitatively by employing the method of Brandt ( 1998 Phys. Rev. B 58 6506) with a Jc( B) law appropriate for a polycrystalline material. Specifically, we observe that the applied field can sweep into the central region either through the thickness of the shield or through the opening ends, the latter mechanism being suppressed for long tubes. For the first time, we systematically detail the spatial variation of the shielding factor ( the ratio of the applied field over the internal magnetic field) along the axis of a high-temperature superconducting tube. The shielding factor is shown to be constant in a region around the centre of the tube, and to decrease as an exponential in the vicinity of the ends. This spatial dependence comes from the competition between two mechanisms of field penetration. The frequency dependence of the shielding factor is also discussed and shown to follow a power law arising from the finite creep exponent n.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Physics
Electrical & electronics engineering
Author, co-author :
Denis, Samuel ;  Royal Military Academy of Belgium & University of Liège
Dusoulier, Laurent;  Royal Military Academy of Belgium & University of Liège
Dirickx, Michel ;  Royal Military Academy of Belgium
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Electrical Engineering & Computer Science > Capteurs et systèmes de mesures électriques
Cloots, Rudi ;  Université de Liège - ULiège > Chimie inorganique structurale
Ausloos, Marcel ;  Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux
Vanderheyden, Benoît  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Language :
English
Title :
Magnetic shielding properties of high-temperature superconducting tubes subjected to axial fields
Publication date :
2007
Journal title :
Superconductor Science and Technology
ISSN :
0953-2048
eISSN :
1361-6668
Publisher :
Iop Publishing Ltd, Bristol, United Kingdom
Volume :
20
Issue :
3
Pages :
192-201
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
RMA - Royal Military Academy [BE]
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