Poster (Scientific congresses and symposiums)
Investigation of the shielding properties of a Bi-2212 bulk superconducting tube subjected to an inhomogeneous magnetic field at various temperatures
Hogan, Kevin; Wera, Laurent; Fagnard, Jean-François et al.
201710th International Workshop Processing and Applications of Superconduting (RE)BCO Large Grain Materials
 

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Keywords :
superconductors; magnetic shielding; inhomogeneity; bulk; variable temperature
Abstract :
[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.
Research center :
Montefiore Institute - Montefiore Institute of Electrical Engineering and Computer Science - ULiège
Disciplines :
Electrical & electronics engineering
Author, co-author :
Hogan, Kevin ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Wera, Laurent ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Fagnard, Jean-François  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Applied and Computational Electromagnetics (ACE)
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
Investigation of the shielding properties of a Bi-2212 bulk superconducting tube subjected to an inhomogeneous magnetic field at various temperatures
Alternative titles :
[en] Investiguation des propriétés de blindage magnétique d'un tube supraconducteur massif en Bi-2212 soumis à un champ magnetique inhomogène à différentes températures
Publication date :
11 December 2017
Number of pages :
A0
Event name :
10th International Workshop Processing and Applications of Superconduting (RE)BCO Large Grain Materials
Event organizer :
Prof. Dr. Masato Murakami and Prof. Dr. Miryala Muralidhar, SIT, Tokyo
Event place :
Tokyo, Japon, Japan
Event date :
2017-12-11 and 2017-12-12
Audience :
International
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
Available on ORBi :
since 21 December 2017

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