Title :
Superconducting cable joint resistance
Author :
Herbelot, O. ; Steeves, M.M. ; Hoenig, M.O.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
Results of a parametric study of the 4.2-K resistance of lap joints between two 27-strand cables of multifilamentary Nb3Sn wire are reported. All joints were between ribbon terminations made by rolling copper-encapsulated cable ends flat. Resistances as functions of current were inferred from current decay time constants of cable-in-conduit conductor loops connected by the joints. The resistances of 23 samples were measured (range of 0.2 to 3 nΩ). It was found that lap joint resistance was a function of current. The influences of solder versus no solder, solder thickness, indium versus tin-lead, ribbon surface oxidation, solder flux, cable twist pitch, wire chrome plating, clamping pressure during heat treatment, ribbon aspect ratio, and joint length are reported
Keywords :
cable jointing; composite superconductors; contact resistance; niobium alloys; soldering; superconducting cables; superconducting magnets; tin alloys; type II superconductors; 0.2 to 3 nohm; 4.2 K; A15 superconductor; cable joint resistance; cable twist pitch; cable-in-conduit conductor loops; clamping pressure; current decay time constants; heat treatment; joint length; lap joints; large superconducting magnets; multifilamentary Nb3Sn wire; ribbon aspect ratio; ribbon surface oxidation; solder flux; solder thickness; superconducting cable; wire chrome plating; Conductors; Electrical resistance measurement; Indium; Niobium; Parametric study; Superconducting cables; Surface resistance; Surface treatment; Tin; Wire;
Journal_Title :
Magnetics, IEEE Transactions on
