superconductor; magnetic measurements; thermal measurements
Abstract :
[en] In this work we study, both experimentally and numerically, the self-heating of a bulk, large YBCO pellet of aspect ratio (thickness / diameter) ~ 0.4 subjected to a large AC magnetic field. To ensure accurate temperature measurements, the sample was placed in an experimental vacuum chamber to achieve a small and reproducible heat transfer coefficient between the superconductor and the cryogenic fluid. The temperature was measured at several locations on the sample surface during the self-heating process. The experimentally determined temperature gradients are found to be very small in this arrangement (< 0.2 K across the radius of the superconductor). The time-dependence of the average temperature T(t) is found to agree well with a theoretical prediction based on the one-dimensional (1-D) Bean model, assuming a uniform temperature in the sample. A 2-D magneto-thermal model was also used to determine the space and time-dependent temperature distribution T(r, z, t) during the application of the AC field. The losses in the bulk pellet were determined using an algorithm based on the numerical method of Brandt, which was combined with a heat diffusion algorithm implemented using a finite-difference method. The model is shown to be able to reproduce the main trends of the observed temperature evolution of the bulk sample during a self-heating process. Finally, the 2-D model is used to study the effect of a non-uniform distribution of critical current density Jc(r, z) on the losses within the bulk superconductor.
Research Center/Unit :
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 :
Laurent, Philippe; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore)
Cardwell, D. A.; University of Cambridge > Engineering Department
Vanderheyden, Benoît ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Vanderbemden, Philippe ; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field
Publication date :
2010
Event name :
PASREG: The 7th International Workshop on the Processing and Applications of Superconducting (RE)BCO Large Grain Materials
Event place :
Washington, DC, United States
Event date :
29–31 July 2010
By request :
Yes
Audience :
International
Journal title :
Superconductor Science and Technology
ISSN :
0953-2048
eISSN :
1361-6668
Publisher :
Institute of Physics, Bristol, United Kingdom
Special issue title :
PASREG: The 7th International Workshop on the Processing and Applications of Superconducting (RE)BCO Large Grain Materials (Washington DC, 29–31 July 2010)
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Bibliography
Campbell, A.M., Cardwell, D.A., (1997) Cryogenics, 37, p. 567
Prikhna, T.A., (2006) Low Temp. Phys., 32, p. 505
Oswald, B., Best, K.J., Setzer, M., Soll, M., Gawalek, W., Gutt, A., Kovalev, L., Freyhardt, H.C., (2005) Supercond. Sci. Technol., 18, pp. S24
Granados, X., Lopez, J., Bosch, R., Bartolomé, E., Lloberas, J., Maynou, R., Puig, T., Obradors, X., (2008) Supercond. Sci. Technol., 21, p. 034010
Jiang, Y., Pei, R., Xian, X., Hong, Z., Coombs, T.A., (2008) Supercond. Sci. Technol., 21, p. 065011
Masson, P.J., Breschi, M., Tixador, P., Luongo, C.A., (2007) IEEE Trans. Appl. Supercond., 17, p. 1533
Hull, J.R., (2000) Supercond. Sci. Technol., 13, pp. R1
Sino, H., Nagashima, K., Arai, Y., (2008) J. Phys.: Conf. Ser., 97, p. 012101
Koshizuka, N., (2006) Physica C, 445-448, p. 1103
Werfel, F.N., (2002) Physica C, 372-376, p. 1482
Tomita, M., Murakami, M., (2003) Nature, 421, p. 517
Eisterer, M., Abhishek, S., (2006) Supercond. Sci. Technol., 19, pp. S530
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