Presentation Design of superconducting magnets for a compact carbon gantry

Iwata, Yoshiyuki  ,  Noda, Koji  ,  Shirai, Toshiyuki

For widespread use of rotating gantries for carbon radiotherapy, we designed a new compact gantry. This new gantry consists of three combined-function superconducting-magnets having a bending angle of 90 degrees. The dipole field of the superconducting magnets is set to be Bmax=5.02 Tesla, corresponding to a bending radius of 1.32 m for transporting carbon ions having kinetic energy of 430 MeV/u. The superconducting magnet also has three independent super-conducting quadrupole-coils, which are to be winded inside of the dipole coil for beam focusing. The dipole and quadrupole coils are electrically isolated in the magnet, and connected to independent power supplies, so that each field component can be independently excited. Having used the combined-function superconducting magnets, the size of the rotating gantry would become very compact; the length and radius are 5.1 m and 4.0 m, respectively. The magnetic field distributions of the super-conducting magnets were calculated with a three-dimensional electromagnetic field solver, Opera-3d code. With calculated fields, the superconducting coils were designed, so as to obtain uniform field distributions. In this paper, the design of this compact rotating gantry as well as the superconducting magnets is presented.
International conference on magnet technology 24 (MT24)

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