Reference : Magnetic shielding properties of high-temperature superconducting tubes subjected to ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Engineering, computing & technology : Electrical & electronics engineering
http://hdl.handle.net/2268/18900
Magnetic shielding properties of high-temperature superconducting tubes subjected to axial fields
English
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 mailto [Université de Liège - ULg > Electrical Engineering & Computer Science > Capteurs et systèmes de mesures électriques > > >]
Cloots, Rudi [Université de Liège - ULg > > Chimie inorganique structurale >]
Ausloos, Marcel [Université de Liège - ULg > Département de physique > Physique statistique appliquée et des matériaux >]
Vanderheyden, Benoît mailto [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes >]
2007
Superconductor Science and Technology
Iop Publishing Ltd
20
3
192-201
Yes (verified by ORBi)
International
0953-2048
Bristol
[en] magnetic shielding ; superconductivity ; magnetic measurements
[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.
Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Royal Military Academy of Belgium
Researchers ; Professionals
http://hdl.handle.net/2268/18900
10.1088/0953-2048/20/3/014
http://stacks.iop.org/SUST/20/192

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