Electromagnetic behaviors of superconducting Nb3Sn wire under a time-dependent current injection

We build a 3D model to analyze the electromagnetic behaviors of Nb3Sn filamentary strand exposed to a time-varying current injection, under the consideration of n value and strain effect. Electromagnetic behaviors, performance degradation and AC loss are investigated. Results show that the filament...

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Bibliographic Details
Published inAIP advances Vol. 4; no. 8; pp. 087131 - 087131-13
Main Authors Ta, Wurui, Li, Yingxu, Gao, Yuanwen
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.08.2014
AIP Publishing LLC
Subjects
Circuits
Critical current (superconductivity)
Current injection
Electromagnetic properties
Intermetallic compounds
Magnetic flux
Niobium stannides
Performance degradation
Three dimensional models
Time dependence
Transport
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Summary:We build a 3D model to analyze the electromagnetic behaviors of Nb3Sn filamentary strand exposed to a time-varying current injection, under the consideration of n value and strain effect. Electromagnetic behaviors, performance degradation and AC loss are investigated. Results show that the filament bundles prevent a further field penetration from the outer shell into the interior matrix. Different current/field profiles occur in the strand and outside. Compared to the critical current, the average transport current keeps a high value with little change over a broader strain range, and has a larger magnitude by several orders of magnitude. Increasing the strain results in a suppression of the current transport capacity, and part of the current is expelled into the metal matrix causing larger AC loss. The larger twist pitch implies a longer current circuit and more magnetic flux enclosed, thus increasing the loss. More details are presented in the paper.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4893770