Performance Improvement of Superconducting Tapes Due to Ferromagnetic Cover on Edges

Improvement of critical current and reduction of AC loss is presented for a common multifilamentary Bi-2223/Ag tape with thin nickel layer electroplated at the edges. Numerical calculations using a commercial finite-element code have been carried out to find the distributions of electrical current a...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2007-06, Vol.17 (2), p.3083-3086
Main Authors: Gomory, F., Souc, J., Seiler, E., Klincok, B., Vojenciak, M., Alamgir, A.K.M., Han, Z., Gu, C.
Format: Article
Language:English
Subjects:
AC losses
Alternating current
Applied sciences
Critical current
Critical current density
CURRENT
CURRENT DENSITY
DENSITY
Electrical engineering. Electrical power engineering
Electronics
ELECTROPLATING
Exact sciences and technology
Ferromagnetism
Finite element methods
High temperature superconductors
Insulation
MAGNETIC FIELD
Magnetic fields
Magnetic losses
MAGNETIC PROPERTIES
Materials
MATHEMATICAL ANALYSIS
Microelectronic fabrication (materials and surfaces technology)
Nickel
Permeability
REDUCTION
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
soft ferromagnetic cover
Superconducting devices
Superconducting films
Superconducting tapes
TAPE
Transport
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Summary:Improvement of critical current and reduction of AC loss is presented for a common multifilamentary Bi-2223/Ag tape with thin nickel layer electroplated at the edges. Numerical calculations using a commercial finite-element code have been carried out to find the distributions of electrical current and magnetic field when the whole section is filled with the critical current density. The dependence of critical current density on local magnetic field and its orientation was taken into consideration, allowing to understand the mechanism of I c increase. Optimization of the cover thickness and width would be possible due to these calculations. AC loss was investigated experimentally in the condition of AC transport and simultaneous action of AC magnetic field in phase with transport current. Reduction of both the transport loss and the magnetization loss has been observed, as well as the loss at simultaneous action of transport AC and applied AC field.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2007.900886