Development of fundamental technology of next generation superconducting cyclotron for heavy particle cancer therapy

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Our objective is to develop an Advanced Hybrid Cyclotron (AHC) using High-Temperature Superconducting (HTS) coil technology with a compact body, high efficiency, and high performance in heavy particle cancer therapy. For cyclotron application, high accuracy magnetic field distribution with isochronous field and azimuthally varying field (AVF) are required. We proposed a coil system be composed of HTS air-core split coils for isochronous field and HTS air-core spiral sector coils for AVF. In this study, to realize the HTS coil system technology for AHC, we performed the following three issues: 1) optimal design of HTS coil system; 2) reduction of irregular magnetic field caused by coil winding error, deformation due to thermal and electromagnetic stress, and screening current induced in tape type superconductor such as Y-system coated conductor; and 3) Experiments on effects of irradiation on commercially available Bi-2223 and YBCO superconducting tapes.