NDLI: Current Ripple Effect on <formula formulatype=inline> <tex>$n$</tex></formula>-Value

Content Provider	IEEE Xplore Digital Library
Author	Goodrich, L.F. Splett, J.D.
Copyright Year	2002
Abstract	We systematically studied the effect of current ripple on the determination of n-value, which is the index of the shape of the electric field-current (E-I) curve. Commercial Nb₃ S n wires were measured with controlled amounts of ac ripple. Substitution- box, superconductor simulator circuits were also measured. A battery-powered current supply was used to provide the dc with ripple currents. The ripple frequencies were 60,120, and 360 Hz, to represent common electrical power harmonics in high-current power supplies. A previous study focused on the effect of ripple on the determination of dc critical current (I_c); the current study focuses on how ripple changes the n-value and shows that ripple has a larger effect on n-value than on I_c. We examined models and measurements on simulators to reproduce and explain the effects observed in measurements on superconductors. Current ripple and spikes may be sources of differences in n-values measured at different laboratories.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2603
Ending Page	2606
Page Count	4
File Size	426864
File Format	PDF
ISSN	10518223
Volume Number	17
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shape Niobium Superconducting filaments and wires Circuit simulation Current supplies Frequency Power system harmonics Power supplies Critical current Current measurement superconducting wires Critical current measurement current ripple niobium compound
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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