MgB₂ wires and magnets have great potentials for helium free superconducting equipments. Representative advantages of MgB₂ magnets are the higher stability and the availability of fast ramping. We demonstrated these advantages by fabricating and testing a prototype magnet for klystron and a magnet for MRI use. Actually, MgB₂ coils inserted in these magnets were made by the Wind&React method. For spreading MgB₂ equipment futhermore, fabricating cost of MgB₂ magnets should be reduced and MgB₂ coils are to be made by the React&Wind method.

In this paper, I will introduce test results of two demonstrated magnets made by the Wind&React method, and then talk about how to bend the sintered MgB₂ wires without Ic degradation for the React&Wind method. Generally, MgB₂ wires at room temperature have the bending tolerance and irreversible strain limit, which is equal to the thermal-pre-compressive strain of MgB₂ filaments. One of our approaches for improving bending tolerances of MgB₂ wires is using metal pipes, which have higher coefficient of thermal expansion. In this presentation, the results of improving bending tolerances of the MgB₂ wires with using SUS pipe as a reinforcing material of MgB₂ wires will be presented.

Keywords: MgB2 wire, Wind and React, React and Wind, Bending radius