[en] When bulk RE-BCO superconductors are used as permanent magnets in engineering applications, they are likely to experience transient variations of the applied magnetic field. The resulting vortex motion may cause a significant temperature increase. As a consequence the initial trapped flux is reduced. In the present work, we first focus on the cause of a temperature increase. The temperature distribution within a superconducting finite cylinder subjected to an alternating magnetic field is theoretically predicted. Results are compared to experimental data obtained by two temperature sensors attached to a bulk YBCO pellet. Second, we consider curative methods for reducing the effect of heat flux on the temperature increase. Hall-probe mappings on YBCO samples maintained out of the thermal equilibrium are performed for two different morphologies : a plain single domain and a single domain with a regularly spaced hole array. The drilled single-domain displays a trapped induction which is weakly affected by the local heating while displaying a high trapped field.
Research Center/Unit :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Electrical & electronics engineering Physics
Author, co-author :
Laurent, Philippe; 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)
Mathieu, J.-P.
Meslin, S.
Noudem, J. G.
Cloots, Rudi ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale - Doyen de la Faculté des Sciences
Ausloos, Marcel ; Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S.
Vanderbemden, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
Study of thermal effects in bulk RE-BCO superconductors submitted to a variable magnetic field
Publication date :
2006
Event name :
European Conference on Applied Superconductivity EUCAS 2005
F.R.S.-FNRS - Fonds de la Recherche Scientifique DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture Ministère Français de la Recherche et de la Technologie
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Bibliography
Campbell, A.M., Cardwell, D.A., (1997) Cryogenics, p. 37
Yamachi, N., Nishikawa, T., Tomita, M., Murakami, M., (2002) Physica, 378-381, p. 377
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