Fabrication and transport properties of an MgB2 solenoid coil

This paper reports on the fabrication and testing of an MgB2 coil made by a wind and react method. We made a 130 m-long Fe/Cu-composite sheathed MgB2-superconducting round wire applying an in situ PIT method. Using a 58 m-long wire, we fabricated a small solenoid coil with 459 turns. The Ic of the coil were measured under different external fields and temperatures. Excellent correspondence of Ic between the short sample and the coil was obtained at 4.2 K and in external fields above 4 T. This indicates that the 58 m-long wire has a very homogeneous Ic distribution. At 25 K this coil generated a maximum magnetic field of 1 T (Ic = 100 A, overall-Jc = 200 A mm-2) in an external field of 0.5 T. At 4.2 K this coil generated 1.9 T (Ic = 184 A, overall-Jc = 366 A mm-2) in the external field of 0.5 T. These results demonstrate the possible use of an MgB2 superconducting coil for superconducting magnet applications such as in MRI