Coupling time constants for modified jelly roll Nb/sub 3/Sn wires

Measurement of the coupling time constant allows an estimate of the coupling loss in AC applications. We report the coupling time constants of Modified Jelly Roll niobium-tin (Nb3Sn) wires which are measured using a modified version of the technique described by Ando(1,2). The coupling time constant is reported for over 200 km of wire at zero applied field. If the pulse field is large enough, two characteristic time constants are observed at zero field. The longer of the two time constants is not observed when a DC magnetic field of >= 0.1T is applied to the sample. The field behavior of the coupling time constant from 0 to 6T is also reported.