Comparison of AC losses of superconducting wires for ramped-field applications

A local maximum at a slow field variation was measured in the AC-loss profile vs. field ramping rate in a double-stacked wire, which is not predicted by the existing AC-loss models. The AC losses of three important superconducting wires, manufactured mainly for superconducting magnets running at lar...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1993-03, Vol.3 (1), p.452-455
Main Authors: Gung, C.Y., Takayasu, M., Minervini, J.V., Ferri, M.A., Steeves, M.M.
Format: Article
Language:English
Subjects:
Applied sciences
Electrical engineering. Electrical power engineering
Exact sciences and technology
Hysteresis
Loss measurement
Magnetic field measurement
Materials
Niobium compounds
Predictive models
Superconducting coils
Superconducting filaments and wires
Superconducting magnets
Tin
Titanium compounds
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Summary:A local maximum at a slow field variation was measured in the AC-loss profile vs. field ramping rate in a double-stacked wire, which is not predicted by the existing AC-loss models. The AC losses of three important superconducting wires, manufactured mainly for superconducting magnets running at large amplitudes and slowly ramping fields, have been measured. These three single-strand samples, including a NbTi, an internal-tin, and a modified jelly-roll internal-tin wire, have different cross sectional constructions. A model taking into account the saturation of the filament bundle walls caused by strong local interbundle coupling currents in the inner multifilament region is proposed to provide a possible explanation to this special loss dependency.< >
ISSN:1051-8223
1558-2515
DOI:10.1109/77.233741