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; and
a charged particle circulation beam path running;
about said center;
through straight sections; and
through turning sections,wherein each of said turning sections comprises at least four bending magnets, said four bending magnets comprising at least eight edge focusing surfaces, wherein geometry of said edge focusing surfaces focuses the charged particles in said charged particle circulation beam path during use, wherein said eight edge focusing surfaces occur within ninety degrees of turn in an acceleration path of said synchrotron,wherein at least two of said four bending magnets further comprise a magnetic field focusing section, said focusing section comprising;
substantially uniform solid 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 comprising a surface of said magnet core proximate and about parallel to a first side of a gap, the first side of the gap and a second side of the gap comprising parallel sides on opposite sides of the charged particle beam path, the parallel sides (a) parallel to a force vector, F, and (b) perpendicular to a magnetic field vector, B, where the force vector and the magnetic field vector form a plane axially crossing the charged particle beam path.
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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
23 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; and a charged particle circulation beam path running; about said center; through straight sections; and through turning sections, wherein each of said turning sections comprises at least four bending magnets, said four bending magnets comprising at least eight edge focusing surfaces, wherein geometry of said edge focusing surfaces focuses the charged particles in said charged particle circulation beam path during use, wherein said eight edge focusing surfaces occur within ninety degrees of turn in an acceleration path of said synchrotron, wherein at least two of said four bending magnets further comprise a magnetic field focusing section, said focusing section comprising; substantially uniform solid 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 comprising a surface of said magnet core proximate and about parallel to a first side of a gap, the first side of the gap and a second side of the gap comprising parallel sides on opposite sides of the charged particle beam path, the parallel sides (a) parallel to a force vector, F, and (b) perpendicular to a magnetic field vector, B, where the force vector and the magnetic field vector form a plane axially crossing the charged particle beam path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for tumor therapy using charged particles, the charged particles accelerated by a rounded corner synchrotron, said method comprising the steps 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 at least four bending magnets, said four bending magnets comprising at least eight edge focusing surfaces, wherein geometry of said edge focusing surfaces focuses the charged particles in said charged particle circulation beam path during use; 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 circulation 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; and forming a uniform magnetic field across a gap, the second cross-sectional area comprising a surface of said magnet core proximate and parallel the gap, wherein the gap comprises parallel sides, the parallel sides;
(a) parallel to a force vector, F, and (b) perpendicular to a magnetic field vector, B, where the force vector and the magnetic field vector form a plane axially crossing the charged particle circulation beam path. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification