Reference : Self-heating of bulk high temperature superconductors of finite height subjected to ...
Scientific congresses and symposiums : Paper published in a journal
Engineering, computing & technology : Electrical & electronics engineering
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/78032
Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field
English
Laurent, Philippe [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > > >]
Fagnard, Jean-François [Ecole Royale Militaire (Belgique) - ERM > CISS Department, SUPRATECS > > >]
Hari Babu, N. [Brunel University, West London, UK > > > >]
Cardwell, D. A. [University of Cambridge > Engineering Department > > >]
Vanderheyden, Benoît [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes >]
Vanderbemden, Philippe [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques > >]
2010
Superconductor Science and Technology
Institute of Physics
23
PASREG: The 7th International Workshop on the Processing and Applications of Superconducting (RE)BCO Large Grain Materials (Washington DC, 29–31 July 2010)
124004
Yes (verified by ORBi)
Yes
International
0953-2048
Bristol
United Kingdom
PASREG: The 7th International Workshop on the Processing and Applications of Superconducting (RE)BCO Large Grain Materials
29–31 July 2010
Washington, DC
USA
[en] superconductor ; magnetic measurements ; thermal measurements
[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.
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 ; Communauté française de Belgique - CfB ; Royal Military Academy (RMA) of Belgium
Researchers ; Professionals
http://hdl.handle.net/2268/78032
10.1088/0953-2048/23/12/124004
http://iopscience.iop.org/0953-2048/23/12/124004

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