Compact synchrotron for regional centers of proton beam therapy

Results on developing the maximum compact synchrotron (average radius R=L/2π=2.15 m, L - perimeter of the orbit) for regional centers of proton beam therapy on the proton energy of 200 MeV are presented. Such a compact arrangement of the accelerator equipment enables to use the radiation protected buildings for regional centers in a number of cases. The RFQ linear accelerator on the energy of 3 MeV is proposed to be used as an injector. The extraction, proposed by developing medicine synchrotrons, significantly decreases the angular spread of the extracted particles and their losses on the septum. It allows to achieve the extraction coefficient of ∼ 90%. Four low-field multipole lenses with independent windings supply, creating dipole, quadrupole and sextupole components of the field with different orientation, were proposed for the field correction