75kG Large Superconducting Magnet

As a part a national project of Japan Agency of Industrial Science & Technology of the MHD power generation, a large superconducting magnet has been built and tested. The magnet has an overall length of 77.4cm, a bore diameter of 10.0cm, an outside diameter of 78.4cm and a weight of 1, 600kg, and composes of three separate pancake coils. The outer two coils and the inner coil were wound with composite superconductors of 1.0cm width by 0.14cm thickness and 1.5cm by 0.20cm, respectively. The conductor is a composite consisting of ten copper-clad Ti-Nb-Ta superconducting wires soldered on a flat side of a copper strip. The test results indicated that the magnet system was capable of stable operation at magnetic field of 75kG. The maximum current supplied to the coils in series was 800A at this operation.