Reference : Investigation of the shielding properties of a Bi-2212 bulk superconducting tube subj...
Scientific congresses and symposiums : Poster
Engineering, computing & technology : Electrical & electronics engineering
http://hdl.handle.net/2268/217324
Investigation of the shielding properties of a Bi-2212 bulk superconducting tube subjected to an inhomogeneous magnetic field at various temperatures
English
[en] Investiguation des propriétés de blindage magnétique d'un tube supraconducteur massif en Bi-2212 soumis à un champ magnetique inhomogène à différentes températures
Hogan, Kevin mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Wera, Laurent mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Fagnard, Jean-François mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Applied and Computational Electromagnetics (ACE) >]
Vanderbemden, Philippe mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
11-Dec-2017
A0
No
No
International
10th International Workshop Processing and Applications of Superconduting (RE)BCO Large Grain Materials
2017-12-11 and 2017-12-12
Prof. Dr. Masato Murakami and Prof. Dr. Miryala Muralidhar, SIT, Tokyo
Tokyo, Japon
Japon
[en] superconductors ; magnetic shielding ; inhomogeneity ; bulk ; variable temperature
[en] Magnetic shielding with bulk superconductors is commonly studied under homogeneous magnetic fields. This configuration simplifies the analysis of the magnetic reaction of the superconductor as the applied magnetic field is known precisely everywhere. In practical applications, however, the magnetic field to be screened is seldom homogeneous. Magnetic shields experience magnetic field gradients and flux lines curvatures that might lead to a deterioration of the shielding properties.
In the present work, we investigate experimentally the magnetic shielding properties of a bulk superconducting Bi-2212 tube subjected to an inhomogeneous magnetic field. This study is carried out at various temperatures thanks to a bespoke variable temperature measurement system based on a cryocooler. A superconducting pancake coil, made of 1G superconducting tape (Bi-2223), generates the inhomogeneous magnetic field to be screened. The bulk superconducting tube is anchored thermally to a sample holder fixed in the vicinity of the cold head. A cryogenic Hall probe is placed at the center of the bulk Bi-2212 tube to characterize the shielding properties of the superconductor.
With this system, we characterize the threshold induction, i.e. the maximal applicable magnetic field below which the shielding factor (ratio between the measured and applied field) drops below a threshold value, at various temperatures ranging from 60 K to 92 K. Then we show and discuss the effect of the sweep rate of the applied magnetic field on the threshold induction value. Our experimental results are confronted to experimental results obtained at 77 K in an axial homogeneous magnetic field. This allow us to emphasize the impact of the inhomogeneity of the applied magnetic field on the shielding properties. We finally point out the portions of the magnetic field shield experiencing the highest magnetic field.
Montefiore Institute of Electrical Engineering and Computer Science - Montefiore Institute
Fonds pour la formation à la Recherche dans l'Industrie et dans l'Agriculture (Communauté française de Belgique) - FRIA
Researchers ; Professionals
http://hdl.handle.net/2268/217324

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