Design of Superconducting Rotating-Gantry for Heavy-Ion Therapy

Y.Iwata, K. Noda, T. Shirai, T. Furukawa, T. Fujita, S. Mori, K. Mizushima, A. Itano, T. Fujimoto, N. Amemiya, T. Ogitsu, T. Obana, I. Watanabe, T. Orikasa, S. Takami, S. Takayama
NIRS, AEC, Kyoto Univ, KEK, NIFS, Toshiba Corp.

An isocentric superconducting rotating-gantry for heavy-ion therapy is being designed. This rotating gantry can transport heavy ions having 430 MeV/u to an isocenter with irradiation angles over 0-360 degrees, and is further capable of performing the fast raster-scanning irradiation. For the magnets, combined-function superconducting-magnets were employed. The use of these superconducting magnets allowed us to design a compact gantry, while keeping a large scan size at the isocenter. The superconducting magnets were designed by using a 3D electromagnetic-field solver, the OPERA-3D code. To verify the design of the magnets, beam tracking simulations were performed. Consequently, we found that calculated beam profiles at the isocenter agreed well with those, designed by the beam optics, proving the validity of our design.

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