Modelling of the influence of magnetic screening on minimisation of transport AC losses in multifilamentary superconductors

Author

Majoros, M. ; Glowacki, B.A. ; Camppbell, A.M.

Author_Institution

Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

2780

Lastpage

2783

Abstract

Numerical modelling was used to investigate the effect on transport ac losses of decoupling the filaments in superconducting tapes by magnetic screening. Both multifilamentary Bi-2223 tapes and multifilamentary YBCO coated conductors were modelled. Different configurations of multifilament geometry with filaments covered with ferromagnetic materials of different thickness and different magnetic permeability were considered. Calculations of ac loss reduction and critical current increase in the presence of a magnetic material with nonlinear magnetisation characteristic were conducted for selected configurations. A comparison with the previous results of a perfect screening was made. Some experimental results on influence of the presence of magnetic material on critical currents and ac losses are also discussed

Keywords

critical currents; eddy current losses; high-temperature superconductors; magnetic permeability; magnetic shielding; magnetisation; multifilamentary superconductors; superconducting tapes; Bi₂Sr₂Ca₂Cu₃O; YBaCuO; critical current; ferromagnetic filament materials; filament decoupling; magnetic permeability; magnetic screening; multifilamentary superconductors; nonlinear magnetisation; numerical modelling; transport AC losses; Conducting materials; Critical current; Geometry; Magnetic materials; Magnetization; Numerical models; Permeability; Superconducting films; Superconducting magnets; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919640

Filename

919640