Charged particle beam extraction method and apparatus used in conjunction with a charged particle cancer therapy system
First Claim
1. An apparatus for extracting a circulating charged particle beam from a synchrotron, said synchrotron having a center, said apparatus comprising:
- an extraction material;
at least a one kilovolt direct current field applied across a pair of extraction blades; and
a deflector,wherein the circulating charged particle beam passes through said extraction material resulting in a reduced energy charged particle beam,wherein the reduced energy charged particle beam passes between said pair of extraction blades, andwherein the direct current field redirects the reduced energy charged particle beam through said deflector,wherein said deflector yields an extracted charged particle beam.
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Accused Products
Abstract
The invention comprises a charged particle beam extraction method and apparatus used in conjunction with charged particle beam radiation therapy of cancerous tumors. The system uses a radio-frequency (RF) cavity system to induce betatron oscillation of a charged particle stream. Sufficient amplitude modulation of the charged particle stream causes the charged particle stream to hit a material, such as a foil. The foil decreases the energy of the charged particle stream, which decreases a radius of curvature of the charged particle stream in the synchrotron sufficiently to allow a physical separation of the reduced energy charged particle stream from the original charged particle stream. The physically separated charged particle stream is then removed from the system by use of an applied field and deflector.
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Citations
26 Claims
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1. An apparatus for extracting a circulating charged particle beam from a synchrotron, said synchrotron having a center, said apparatus comprising:
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an extraction material; at least a one kilovolt direct current field applied across a pair of extraction blades; and a deflector, wherein the circulating charged particle beam passes through said extraction material resulting in a reduced energy charged particle beam, wherein the reduced energy charged particle beam passes between said pair of extraction blades, and wherein the direct current field redirects the reduced energy charged particle beam through said deflector, wherein said deflector yields an extracted charged particle beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for extracting a circulating charged particle beam from a synchrotron, comprising the steps of:
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transmitting the circulating charged particle beam through an extraction material, said extraction material yielding a reduced energy charged particle beam; applying at least five hundred volts across a first pair of blades; and passing the reduced energy charged particle beam between said first pair of blades, wherein said first pair of blades redirect the reduced energy charged particle beam to a deflector, wherein said deflector yields an extracted charged particle beam. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method for extracting a circulating charged particle beam from a synchrotron, comprising the steps of:
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transmitting the circulating charged particle beam through an extraction material, said extraction material yielding a reduced energy charged particle beam; applying a field of at least five hundred volts across a pair of extraction blades; passing the reduced energy charged particle beam between said pair of extraction blades, wherein said field redirects the reduced energy charged particle as an extracted charged particle beam. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification