[en] Type-II superconducting hollow cylinders can act as efficient passive magnetic shields. Unlike in ferromagnetic materials, the magnetic shielding mechanism in a superconductor occurs through persistent currents flowing on the macroscopic scale. When a superconducting tube is used to shield a sequence of magnetic fields with different orientations, magnetic shielding performance levels are likely to be degraded because of the superconducting currents that are trapped in the superconductor. In this chapter we study experimentally the magnetic shielding configurations where an external magnetic field is applied first along one direction and a second field is subsequently applied along another (perpendicular) direction. In particular, we focus on the effect of an axial trapped field on the transverse shielding performance and on the effect of a transverse trapped field on the axial or the transverse shielding performance. Finally, we show how the pristine state of the tube can be restored by an appropriate magnetic field sequence, i.e., without heating up the shield above its critical temperature Tc.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Wéra, Laurent; 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)
Hogan, Kevin; Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore)
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 :
The influence of an initial trapped field on the magnetic shielding performance of bulk high-temperature superconducting tubes
Publication date :
2018
Main work title :
High-Temperature Superconductors: Occurrence, Synthesis and Applications
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