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Influence of structure of fine filament NbTi composite on its electromagnetic characteristics

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9 Author(s)
Hlasnik, I. ; Div. of Electr. & Comput. Eng., Yokohama Nat. Univ., Yokohama, Japan ; Tsukamoto, O. ; Fukui, S. ; Kumano, T.
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The study of the influence of filament diameter d/sub f/, filament spacing b/sub n/, and B on critical current density J/sub c/ and AC losses p/sub s/ in one type of fine filament composite (FFC) has revealed two components of J/sub c/, the bulk and surface critical current densities J/sub cb/ and J/sub cs/, respectively. A simple relationship between them, J/sub c/, and geometrical parameters of FFC including those with different types of artificial pinning centers (APCs) is formulated. It is used to explain measured J/sub c/(B,d/sub f/) dependence in FFC with island-type APC as well as to discuss the prospects of both types of APC in FFC for AC use. To verify the theoretical results, a series of FFC samples with sheet-type APC has been prepared and measured. Experimental values of J/sub c/(B,d/sub f/) obtained in this series of samples are smaller than expected. One possible reason for this difference is suggested.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 1 )