CUED Publications database

Numerical study of the shielding properties of macroscopic hybrid ferromagnetic/superconductor hollow cylinders

Lousberg, GP and Fagnard, J-F and Ausloos, M and Vanderbemden, P and Vanderheyden, B (2010) Numerical study of the shielding properties of macroscopic hybrid ferromagnetic/superconductor hollow cylinders. IEEE Transactions on Applied Superconductivity, 20. pp. 33-41. ISSN 1051-8223

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Abstract

We study the magnetic shielding properties of hybrid ferromagnetic/ superconductor (F/S) structures consisting of two coaxial cylinders, with one of each material. We use an axisymmetric finite-element model in which the electrical properties of the superconducting tube are modeled by a nonlinear E-J power law with a magnetic-field-dependent critical current density whereas the magnetic properties of the ferromagnetic material take saturation into account. We study and compare the penetration of a uniform axial magnetic field in two cases: 1) a ferromagnetic tube placed inside a larger superconducting tube (Ferro-In configuration) and 2) a ferromagnetic tube placed outside the superconducting one (Ferro-Out configuration). In both cases, we assess how the ferromagnetic tube improves the shielding properties of the sole superconducting tube. The influence of the geometrical parameters of the ferromagnetic tube is also studied: It is shown that, upon an optimal choice of the geometrical parameters, the range of magnetic fields that are efficiently shielded by the high-temperature superconductor tube alone can be increased by a factor of up to 7 (2) in a Ferro-Out (Ferro-In) configuration. The optimal configuration uses a 1020 carbon steel with a thickness of 2 mm and a height that is half that of the superconducting cylinder (80 mm). © 2009 IEEE.

Item Type: Article
Uncontrolled Keywords: Ferromagnetic/high-temperature superconductors (HTSs) hybrid structure Finite element Magnetic shield
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:28
Last Modified: 08 Dec 2014 02:22
DOI: 10.1109/TASC.2009.2036855