NDLI: Effect of Copper Resistivity and Filament Size on the Self-Field Instability of High- <formula formulatype=inline><tex Notation=TeX>$J_{rm c}$</tex></formula> <formula formulatype=inline><tex Notation=TeX>$hbox{Nb}

Content Provider	IEEE Xplore Digital Library
Author	Ghosh, A.K.
Copyright Year	2002
Abstract	Nb₃Sn strands with large filaments and high-J_c exhibit instabilities due to magnetization flux-jumps at low fields in changing magnetic fields. In addition, at intermediate fields of 5 to 7 T, these strands quench prematurely at currents well below the critical current. Current-voltage measurements are typically used for critical current determinations, and the premature quenching observed is driven by current redistribution within the strand as the current is increased and is termed “self-field” instability. This instability is exacerbated as the temperature is lowered from 4.2 K to 2 K superfluid helium. A previous study examined wires in the “quasi-adiabatic” limit, where dynamic heat transfer mechanisms are suppressed. In this paper, we report on measurements in the temperature range of 4.2-2 K on high-J_c RRP strands with varying copper stabilizer resistivities and Nb₃Sn filament diameters. These measurements show that the residual resistivity ratio, RRR, of the copper stabilizer plays an important role in mitigating this instability. Also for strands with similar RRR, we find that the stability improves with decreasing filament diameters, although the improvement is not very dramatic.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	7100407
Ending Page	7100407
Page Count	1
File Size	792039
File Format	PDF
ISSN	10518223
Volume Number	23
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wires Current measurement Copper Magnetization Integrated circuits Temperature measurement Magnetic field measurement self-field instability $\hbox{Nb}_{3}\hbox{Sn}$ superconducting wires quench current
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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