CONCEPTUAL DESIGN OF CARBON/PROTON SYNCHROTRON FOR PARTICLE BEAM THERAPY

Slow cycle synchrotron system for cancer therapy is presented to realize the pencil beam scanning with carbon and proton beam. The designed synchrotron’s circumference is 60m and the maximum beam energies are 480MeV/u for carbon and 250MeV for proton. In the treatment system using the presented synchrotron, the discrete spot-scanning scheme for lateral irradiation is employed using fast beam ON/OFF method. This beam switching method is one of the characteristics of the RF driven slow extraction (RFDE) from the synchrotron. On the other hand, distal dose distribution is controlled with energy stacking technique, which is superposition of various Bragg peaks. Bragg peaks are directly controlled by extraction energy from synchrotron.