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Modification of the trapped field in bulk HTS as a result of the drilling of a pattern of artificial holes
Lousberg, G. P.; Fagnard, Jean-François; Ausloos, Marcel et al.
2010In Journal of Physics. Conference Series, 234, p. 012023
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Abstract :
[en] The trapped magnetic field is examined in bulk high-temperature superconductors that are artificially drilled along their c-axis. The influence of the hole pattern on the magnetization is studied and compared by means of numerical models and Hall probe mapping techniques. To this aim, we consider two bulk YBCO samples with a rectangular cross-section that are drilled each by six holes arranged either on a rectangular lattice (sample I) or on a centered rectangular lattice (sample II). For the numerical analysis, three different models are considered for calculating the trapped flux: (i), a two-dimensional (2D) Bean model neglecting demagnetizing effects and flux creep, (ii), a 2D finite-element model neglecting demagnetizing effects but incorporating magnetic relaxation in the form of an E – J power law, and, (iii), a 3D finite element analysis that takes into account both the finite height of the sample and flux creep effects. For the experimental analysis, the trapped magnetic flux density is measured above the sample surface by Hall probe mapping performed before and after the drilling process. The maximum trapped flux density in the drilled samples is found to be smaller than that in the plain samples. The smallest magnetization drop is found for sample II, with the centered rectangular lattice. This result is confirmed by the numerical models. In each sample, the relative drops that are calculated independently with the three different models are in good agreement. As observed experimentally, the magnetization drop calculated in the sample II is the smallest one and its relative value is comparable to the measured one. By contrast, the measured magnetization drop in sample (1) is much larger than that predicted by the simulations, most likely because of a change of the microstructure during the drilling process.
Disciplines :
Electrical & electronics engineering
Physics
Author, co-author :
Lousberg, G. P.;  Université de Liège - ULiège
Fagnard, Jean-François  ;  Université de Liège - ULiège > Doct. sc. ingé.(élec.& électro. - Bologne)
Ausloos, Marcel ;  Université de Liège - ULiège > Département de physique > Département de physique
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Vanderheyden, Benoît  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Language :
English
Title :
Modification of the trapped field in bulk HTS as a result of the drilling of a pattern of artificial holes
Publication date :
2010
Event name :
9th European Conference on Applied Superconductivity - EUCAS 2009
Event place :
Dresden, Germany
Event date :
13-17 September 2009
Audience :
International
Journal title :
Journal of Physics. Conference Series
ISSN :
1742-6588
eISSN :
1742-6596
Publisher :
IOPScience
Volume :
234
Pages :
012023
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 September 2010

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