A Compact Proton Synchrotron for Cancer Treatments

A compact proton synchrotron for cancer treatments is presented. In the present synchrotron, the beam can be accelerated up to 270MeV for the application to proton radiography as well as cancer treatments. In order to shorten the straight section for the extraction deflector such as a septum magnet, the deflections due to the defocusing quadrupole and edge type bending magnets in the synchrotron lattice are utilized effectively. The beam is extracted by the resonant extraction scheme which features that the position and gradient of the extracted beam are constant and the rapid switching is possible. Then, the present synchrotron can be applied to various irradiation schemes such as the double scattering, wobbler and raster scanning methods.