Design of the superconducting magnet for a compact heavy-ion synchrotron 2

QST has started the project of a quantum scalpel to realize further compactness and low-cost facility for carbon-ion radiotherapy (CIRT). One of the quantum scalpel projects is the development of synchrotron employing superconducting technology and detailed designing of the superconducting magnet is advancing. Maximum dipole field of 3.5 T is adapted, and it is operated at a ramp speed of 0.7 T/s. To suppress the coil load factor less than 70%, the maximum excitation current is determined to be 265A. In addition, to achieve a lower magnetomotive force with a compactness magnet shape, the effective magnetic field size and the magnetic field uniformity are reconsidered based on the synchrotron's simulation. These are described in this report. (author)