program abstracts
Saturday, 3F-03, 8:50-9:00
AC Losses in Coated Conductors Integrated for Practical Applications and Strategies for their Reduction
Naoyuki Amemiya
Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo, Kyoto 615-8510, Japan
telephone:+81 75 383 2220,, fax:+81 75 383 2224, e-mail address:amemiya@kuee.kyoto-u.ac.jp
Abstract: AC loss reduction is one of the critical issues toward the practical applications of coated conductors. Coated conductors show varieties of AC loss characteristics because of their thin strip shape of superconductor, their composite structure, etc. In principle, AC losses are generated through the penetration of magnetic flux into superconductor. In case of thin strip of superconductor such as superconductor layer in coated conductor, the magnetic flux penetration from its edges generates much larger AC loss than the magnetic flux penetration from its wide faces. If the substrate of a coated conductor is magnetic, it attracts magnetic flux lines to change the magnetic flux distribution around the coated conductor and influence the AC loss characteristic of the coated conductor. When coated conductors are integrated into an electrical device, the shape of their assembly also influences the mode of magnetic flux penetration into each coated conductor.
We have been measuring AC losses of isolated coated conductor as well as assembled coated conductors. Combined with these experimental results with the results of numerical electromagnetic simulations, the AC loss characteristics of coated conductors integrated with various manners, such as mono and multi layer polygonal assemblies, tape-on-tape stack, will be discussed to find strategies for AC loss reduction. With respect to the composite structure, we will focus on superconductor and ferromagnetic composite structure in an isolated coated conductor and in assembled coated conductors. Influence of non-uniformity of critical current density will be discussed from the viewpoint post-fabrication processing such as cutting into narrow strips.
This work was supported by the NEDO.
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