Title :
AC loss time constant measurements on Nb/sub 3/Al multifilamentary superconductors
Author :
Painter, T.A. ; Iwasa, Y. ; Ando, T. ; Tsuji, H. ; Shimamoto, S.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
AC loss time constants have been measured by an inductive method developed at the Japan Atomic Energy Research Institute. Measurements were performed on four multifilamentary Nb/sub 3/Al test wires, manufactured by the jelly-roll method and one multifilamentary NbTi test wire. The theoretical AC loss time constants were calculated and compared with the measured values. The time constants of the Nb/sub 3/Al wires were found to vary as the square of the twist pitch as predicted. The Nb/sub 3/Al wires have time constants that are higher than the lower limit predicted by theory, suggesting that the contact resistance between the copper matrix and superconducting filaments is lower than that in the NbTi wire.<>
Keywords :
aluminium alloys; fusion reactor materials; magnetic leakage; niobium alloys; superconducting magnets; AC loss time constant; Cu matrix; Nb/sub 3/Al multifilamentary superconductors; Nb/sub 3/Al wires; contact resistance; inductive method; jelly-roll method; multifilamentary Nb/sub 3/Al test wires; multifilamentary NbTi test wire; superconducting filaments; twist pitch; Atomic measurements; Energy measurement; Loss measurement; Manufacturing; Niobium compounds; Performance evaluation; Testing; Time measurement; Titanium compounds; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
