Patent ID: 8067748

Claim:
An apparatus for tumor therapy using charged particles, the charged particles accelerated by a rounded corner polygon synchrotron, said synchrotron comprising: a center; a charged particle circulation beam path running; about said center; through straight sections; and through turning sections, wherein each of said turning sections comprises a plurality of bending magnets, wherein at least two of said plurality of bending magnets further comprise a magnetic field focusing section, said focusing section comprising: a magnet core geometry tapering from a first cross-sectional area extending from opposite sides of a first winding about said core to a second cross-sectional area, said second cross-sectional area comprising less than two-thirds of an area of said first cross-sectional area, said second cross-sectional area proximate and about parallel to said charged particle beam path; and a computer implemented extraction control algorithm, said extraction control algorithm configured to receive input generated by a current originating at an extraction foil, said extraction foil proximate said charged particle circulation beam path, said extraction control algorithm configured to compare a feedback input to an irradiation plan, said extraction control algorithm configured to adjust a radio-frequency field in a radio-frequency cavity system.