Charged particle beam acceleration and extraction method and apparatus used in conjunction with a charged particle cancer therapy system
OwnerVladimir Balakininventor
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Abstract
The invention comprises a charged particle beam acceleration and optional extraction method and apparatus used in conjunction with charged particle beam radiation therapy of cancerous tumors. Novel design features of a synchrotron are described. Particularly, turning magnets, edge focusing magnets, concentrating magnetic field magnets, and extraction elements are described that minimize the overall size of the synchrotron, provide a tightly controlled proton beam, directly reduce the size of required magnetic fields, directly reduces required operating power, and allow continual acceleration of protons in a synchrotron even during a process of extracting protons from the synchrotron.
Claims24
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.
A method for tumor therapy using charged particles, the charged particles accelerated by a rounded corner synchrotron, said method comprising the step of:
- accelerating the charged particles in a charged particle circulation beam path running about a center of said synchrotron, said charged particle circulation beam path comprising:
- straight sections;
- and
- turning sections, wherein each of said turning sections comprises a plurality of bending magnets;
- and
- focusing the charged particles using at least two of said plurality of bending magnets that 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, wherein said geometry carries a magnetic field during use, wherein the magnetic field concentrates in density from said first cross-sectional area to said second-cross-sectional area
- wherein said synchrotron further comprises:
- an extraction material;
- at least a one kilovolt direct current field applied across a pair of extraction blades;
- and
- a deflector
- wherein the charged particles pass through said extraction material resulting in reduced energy charged particles,
- wherein the reduced energy charged particles pass between said pair of extraction blades,
- wherein the direct current field redirects the reduced energy charged particles out of said synchrotron through said deflector, and
- wherein said deflector yields an extracted charged particle beam.
Dependencies are inferred from the claim text.