Solenoid coils of up to 100 turns, fabricated with Cu-sheathed MgB2 wires using a wind-reaction in situ technique, were prepared. In spite of the low density of the single core, and of some reaction between the Mg and Cu sheaths, the results demonstrated that the decrease in JC with increasing length of MgB2 wires was insignificant. Solenoid coils with diameters as small as 10mm could be readily fabricated by using a wind-reaction in situ technique. The JC of the coils was essentially the same as that of comparable straight wires. A JC of 133000A/cm2 and 125000A/cm2 at 4K and self-field was achieved for a small coil wound using Cu-sheathed tape and Cu-sheathed wire, respectively.

Transport Critical Current of Solenoidal MgB2/Cu Coils Fabricated using a Wind-Reaction in situ Technique. S.Soltanian, J.Horvat, X.L.Wang, M.Tomsic, S.X.Dou: Superconductor Science and Technology, 2003, 16, L4-6