METHOD AND APPARATUS FOR INTENSITY CONTROL OF A CHARGED PARTICLE BEAM EXTRACTED FROM A SYNCHROTRON
First Claim
1. An apparatus for controlling intensity of charged particles extracted from a circulating charged particle beam path in a synchrotron, said apparatus comprising:
- a radio-frequency field generator, wherein during use said radio-frequency generator applies a radio-frequency field to the circulating charged particles yielding betatron oscillating charged particles;
an extraction material, wherein at least a portion of the betatron oscillating charged particles pass through said extraction material resulting in a secondary emission electron flow;
an intensity sensor, said intensity sensor determining a measure of said electron flow; and
a feedback control loop comprising an intensity controller, wherein said intensity controller provides said measure of electron flow as a feedback to said radio-frequency generator,wherein said feedback control loop controls intensity of charged particles extracted from said synchrotron via control of said radio-frequency generator,wherein intensity comprises a number of the charged particles extracted as a function of time.
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Abstract
The invention comprises intensity control of a charged particle beam acceleration, extraction, and/or targeting method and apparatus used in conjunction with charged particle beam radiation therapy of cancerous tumors. Particularly, intensity of a charged particle stream of a synchrotron is described. Intensity control is described in combination with turning magnets, edge focusing magnets, concentrating magnetic field magnets, winding and control coils, and extraction elements of the synchrotron. The system reduces the overall size of the synchrotron, provides a tightly controlled proton beam, directly reduces the size of required magnetic fields, directly reduces required operating power, and allows continual acceleration of protons in a synchrotron even during a process of extracting protons from the synchrotron.
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Citations
19 Claims
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1. An apparatus for controlling intensity of charged particles extracted from a circulating charged particle beam path in a synchrotron, said apparatus comprising:
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a radio-frequency field generator, wherein during use said radio-frequency generator applies a radio-frequency field to the circulating charged particles yielding betatron oscillating charged particles; an extraction material, wherein at least a portion of the betatron oscillating charged particles pass through said extraction material resulting in a secondary emission electron flow; an intensity sensor, said intensity sensor determining a measure of said electron flow; and a feedback control loop comprising an intensity controller, wherein said intensity controller provides said measure of electron flow as a feedback to said radio-frequency generator, wherein said feedback control loop controls intensity of charged particles extracted from said synchrotron via control of said radio-frequency generator, wherein intensity comprises a number of the charged particles extracted as a function of time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling intensity of charged particles extracted from a circulating charged particle beam path in a synchrotron, said method comprising the steps of:
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generating a radio-frequency field using a radio-frequency field generator, wherein said radio-frequency generator applies the radio-frequency field across the circulating charged particle beam path yielding oscillating charged particles; traversing at least a portion of the oscillating charged particles through an extraction material yielding a secondary emission electron flow; determining a measure of the electron flow using an intensity sensor; and providing the measure of the electron flow to an intensity controller via a feedback control loop, wherein said intensity controller controls intensity of charged particles extracted from said synchrotron via control of said radio-frequency generator, wherein intensity comprises a number of the charged particles extracted as a function of time. - View Dependent Claims (8)
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9. An apparatus for extracting intensity controlled charged particles from charged particles circulating in a synchrotron of a charged particle cancer therapy system, comprising:
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oscillation blades, said oscillation blades comprising a radio-frequency voltage across said blades during use, said radio-frequency inducing oscillating charged particles from the charged particles circulating in said synchrotron; an extraction material in said synchrotron, wherein the oscillating charged particles traverse said extraction material during use generating both reduced energy charged particles and secondary emission electrons; and extraction blades, said extraction blades extracting said reduced energy charged particles from said synchrotron. - View Dependent Claims (10, 11, 12)
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13. A method for extracting intensity controlled charged particles from charged particles circulating in a synchrotron, comprising the steps of:
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inducing oscillating charged particles from the charged particles circulating in said synchrotron using a radio-frequency voltage applied across a pair of oscillation blades, traversing the oscillating charged particles through an extraction material in said synchrotron, said step of traversing generating both reduced energy charged particles and a current; and extracting said reduced energy charged particles from said synchrotron by passing the reduced energy charged particles through an extraction field between two extraction blades. - View Dependent Claims (14, 15, 16)
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17. 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 both; a reduced energy charged particle beam; and a secondary emission current; 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 (18, 19)
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Specification