Fundamental studies on superconducting coil systemofheavy-ion accelerator for cancer therapy

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Japan has a good track record in the heavy-ion radiotherapy which is a powerful method for cancer treatment. To expand this excellent therapeutic technique onto the world stage, the development of further reduced size, high-efficiency and low-cost accelerator. To realize the application of HTS (High Temperature Superconductor) coil to cyclotron system, we conducted preliminary experiments of the neutron irradiation to HTS tapes. And we made radioactive analyses on HTS tapes and measured the superconducting characteristics before and after the irradiation. We also performed a trial design of HTS coil for medical cyclotron system.