DocumentCode :
1499274
Title :
Study of serviceability of superconducting wires at 50-Hz frequency
Author :
Aksenova, E.N. ; Aksenov, P.V. ; Kruglo, V.S. ; Zelensky, G.K. ; Nikulenkov, E.V.
Author_Institution :
I.V. Kurchatov Inst. of Atomic Energy, Moscow, USSR
Volume :
25
Issue :
2
fYear :
1989
fDate :
3/1/1989 12:00:00 AM
Firstpage :
2116
Lastpage :
2118
Abstract :
A stationary equation for thermal conductivity is solved for a multifilamentary superconducting wire in the AC external magnetic field with an in-phase varying transport current of the amplitude j mjc on the assumption of a uniform current distribution between the filaments. Taking into account the temperature distribution over the wire cross section and the current-voltage characteristic exponential smearing over the temperature T0 and current j0 the condition for determining the wire serviceability in the dynamic regime, T(0)-TbT0(j c-jm) j0, is suggested. T(0) is the wire core temperature, Tb is the bath temperature, and jc is the current critical density. It has been confirmed experimentally on microsolenoids operating at 50 Hz that the main characteristic of the wire serviceability in the dynamic regime is a magnetic field amplitude which can be estimated from the proposed relation for any given frequency, provided that jmjc. The calculated and experimentally observed serviceability ranges of investigated Nb-Ti, Nb 3Sn wires, and in situ SC agree with accuracy no worse than 30%
Keywords :
composite superconductors; thermal conductivity of solids; wires (electric); 50 Hz; AC magnetic field; Nb-Ti; Nb3Sn; bath temperature; current critical density; current-voltage characteristic exponential smearing; dynamic regime; in situ superconductor; in-phase varying transport current; magnetic field amplitude; microsolenoids; multifilamentary wire; serviceability; stationary equation; superconducting wires; temperature distribution; thermal conductivity; uniform current distribution; wire core temperature; Amplitude estimation; Current distribution; Current-voltage characteristics; Equations; Frequency estimation; Magnetic fields; Niobium; Superconducting filaments and wires; Temperature distribution; Thermal conductivity;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.92726
Filename :
92726
Link To Document :
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