Superconducting bending magnet for superconducting ring cyclotron

A K2500 superconducting ring cyclotron with 6-sectors is being constructed at RIKEN as an energy booster of the existing K540 ring cyclotron. The bending magnet for beam injection should be superconducting. Required fields are about 4 T and curvature of the coils is about 1.2 m. We developed test cells for the bending magnet. The results are very promising for the real bending magnet. In the paper the results of the test cells and the design of the real bending magnets are described.