Charged particle beam acceleration and extraction method and apparatus used in conjunction with a charged particle cancer therapy system
First Claim
1. 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.
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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.
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Citations
24 Claims
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1. An apparatus for tumor therapy using charged particles, the charged particles accelerated by a rounded corner polygon synchrotron, said synchrotron comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for tumor therapy using charged particles, the charged particles accelerated by a rounded corner synchrotron, said method comprising the step of:
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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. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification