Reference : Bulk high-Tc superconductors with drilled holes: how to arrange the holes to maximize th...
Scientific journals : Article
Engineering, computing & technology : Electrical & electronics engineering
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/18902
Bulk high-Tc superconductors with drilled holes: how to arrange the holes to maximize the trapped magnetic flux?
English
Lousberg, Grégory [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes >]
Ausloos, Marcel [Université de Liège - ULg > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S. >]
Vanderbemden, Philippe mailto [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Vanderheyden, Benoît [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes >]
Feb-2008
Superconductor Science and Technology
Institute of Physics
21
025010
Yes (verified by ORBi)
International
0953-2048
Bristol
United Kingdom
[en] superconductors ; magnetic properties ; artificial holes
[en] Drilling holes in a bulk high-Tc superconductor enhances the oxygen annealing and the heat
exchange with the cooling liquid. However, drilling holes also reduces the amount of magnetic
flux that can be trapped in the sample. In this paper, we use the Bean model to study the
magnetization and the current line distribution in drilled samples, as a function of the hole
positions. A single hole perturbs the critical current flow over an extended region that is
bounded by a discontinuity line, where the direction of the current density changes abruptly. We
demonstrate that the trapped magnetic flux is maximized if the centre of each hole is positioned
on one of the discontinuity lines produced by the neighbouring holes. For a cylindrical sample,
we construct a polar triangular hole pattern that exploits this principle; in such a lattice, the
trapped field is ∼20% higher than in a squared lattice, for which the holes do not lie on
discontinuity lines. This result indicates that one can simultaneously enhance the oxygen
annealing, the heat transfer and maximize the trapped field.
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
Researchers ; Professionals
http://hdl.handle.net/2268/18902
10.1088/0953-2048/21/02/025010
http://www.iop.org/EJ/abstract/0953-2048/21/2/025010/

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