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Strong Localization of the Density of Power Losses in Type-II Superconducting Wires

Ruiz, H. S. and Badía-Majós, A. and Genenko, Yuri A. and Yampolskii, Sergey V. (2013):
Strong Localization of the Density of Power Losses in Type-II Superconducting Wires.
In: IEEE Transactions on Applied Superconductivity, The IEEE Council on Superconductivity , p. 8000404, 23, (3), ISSN 1051-8223,
[Online-Edition: http://dx.doi.org/10.1109/TASC.2012.2232695],
[Article]

Abstract

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A round straight superconducting wire has been used as numerical prototype for pursuing a comprehensive study on the local distribution of current and the density of power losses, attained by the simultaneous action of an ac transport current and an oscillating transverse magnetic field. The numerical simulations have been performed within the quasi-steady approach of the critical state theory, including virgin and premagnetized wires. A wide variety of shapes for the flux fronts characterizing the local dynamics of the electromagnetic quantities across the section of the wire has been revealed. Under special conditions, flux fronts characterized either by the so-called “field-like”, or “current-like ” shapes are shown, with the occurrence of multiple domains of current flow detached by thin lines acting as boundaries between the critical values Ic and -Ic. Despite the lack of symmetry for attaining at least an intuitive definition of the shape of the flux front, a universal pattern of the distribution of magnetic flux density has been identified. Also, a strong asymmetric localization of the density of power losses has been envisaged, as long as synchronous electromagnetic excitations are used.

Item Type: Article
Erschienen: 2013
Creators: Ruiz, H. S. and Badía-Majós, A. and Genenko, Yuri A. and Yampolskii, Sergey V.
Title: Strong Localization of the Density of Power Losses in Type-II Superconducting Wires
Language: English
Abstract:

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A round straight superconducting wire has been used as numerical prototype for pursuing a comprehensive study on the local distribution of current and the density of power losses, attained by the simultaneous action of an ac transport current and an oscillating transverse magnetic field. The numerical simulations have been performed within the quasi-steady approach of the critical state theory, including virgin and premagnetized wires. A wide variety of shapes for the flux fronts characterizing the local dynamics of the electromagnetic quantities across the section of the wire has been revealed. Under special conditions, flux fronts characterized either by the so-called “field-like”, or “current-like ” shapes are shown, with the occurrence of multiple domains of current flow detached by thin lines acting as boundaries between the critical values Ic and -Ic. Despite the lack of symmetry for attaining at least an intuitive definition of the shape of the flux front, a universal pattern of the distribution of magnetic flux density has been identified. Also, a strong asymmetric localization of the density of power losses has been envisaged, as long as synchronous electromagnetic excitations are used.

Journal or Publication Title: IEEE Transactions on Applied Superconductivity
Volume: 23
Number: 3
Publisher: The IEEE Council on Superconductivity
Uncontrolled Keywords: Critical state, power losses, superconducting wires
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 27 Jun 2013 08:39
Official URL: http://dx.doi.org/10.1109/TASC.2012.2232695
Identification Number: doi:10.1109/TASC.2012.2232695
Funders: This work was supported in part by the Spanish MINECO and the European FEDER program (under Project MAT2011-22719 and Project ENE2011-29741), and by the DGA Grant T12/2011.
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