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Experimental and theoretical study of AC losses in variable asymmetrical magnetic environments

Ranecky, S. T. and Watanabe, H. and Ogawa, J. and Oka, T. and Gölden, D. and Alff, L. and Genenko, Y. A. (2017):
Experimental and theoretical study of AC losses in variable asymmetrical magnetic environments.
In: Superconductor Science and Technology, IOP Publishing, pp. 085005, 30, (8), ISSN 0953-2048,
DOI: 10.1088/1361-6668/aa73bc,
[Online-Edition: https://doi.org/10.1088/1361-6668/aa73bc],
[Article]

Abstract

Measurements of AC losses in a HTS-tape placed in between two bulk magnetic shields of high permeability were performed by applying calorimetric techniques for various asymmetrical shielding arrangements. The experiment was supported by analytical calculations and finite-element simulations of the field and current distributions, based on the Bean model of the critical state. The simulated current and field profiles perfectly reproduce the analytic solutions known for certain shielding geometries. The evaluation of the consequent AC losses exhibits good agreement with measurements for the central position of the tape between the magnets but have increasing discrepancy when the tape is approaching the shields. This can be explained by the increasing contribution of the eddy currents and magnetic hysteresis losses in the conducting shields.

Item Type: Article
Erschienen: 2017
Creators: Ranecky, S. T. and Watanabe, H. and Ogawa, J. and Oka, T. and Gölden, D. and Alff, L. and Genenko, Y. A.
Title: Experimental and theoretical study of AC losses in variable asymmetrical magnetic environments
Language: English
Abstract:

Measurements of AC losses in a HTS-tape placed in between two bulk magnetic shields of high permeability were performed by applying calorimetric techniques for various asymmetrical shielding arrangements. The experiment was supported by analytical calculations and finite-element simulations of the field and current distributions, based on the Bean model of the critical state. The simulated current and field profiles perfectly reproduce the analytic solutions known for certain shielding geometries. The evaluation of the consequent AC losses exhibits good agreement with measurements for the central position of the tape between the magnets but have increasing discrepancy when the tape is approaching the shields. This can be explained by the increasing contribution of the eddy currents and magnetic hysteresis losses in the conducting shields.

Journal or Publication Title: Superconductor Science and Technology
Volume: 30
Number: 8
Publisher: IOP Publishing
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 > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 11 Dec 2017 11:33
DOI: 10.1088/1361-6668/aa73bc
Official URL: https://doi.org/10.1088/1361-6668/aa73bc
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