Charged-particle beam accelerator, particle beam radiation therapy system using the charged-particle beam accelerator, and method of operating the particle beam radiation therapy system
First Claim
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1. A charged-particle beam accelerator comprising:
- means for accelerating a charged-particle beam and circulating the charged-particle beam along an orbiting path;
means for causing betatron oscillation of charged particles in a resonating state outside a stable region of resonance;
means for increasing the amplitude of the betatron oscillation of the charged-particle beam within the stable region of resonance; and
means for varying the stable region of resonance;
wherein said means for increasing the amplitude of the betatron oscillation is controllably operated within a frequency range in which the circulating beam does not go beyond a boundary of the stable region of resonance, and said means for varying the stable region of resonance is controllably operated with appropriate timing as required for beam extraction so that the charged-particle beam is extracted with desired timing.
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Abstract
A charged-particle beam accelerator includes an RF-KO unit for increasing the amplitude of betatron oscillation of a charged-particle beam within a stable region of resonance and an extraction quadrupole electromagnet unit for varying the stable region of resonance. The RF-KO unit is operated within a frequency range in which the circulating beam does not go beyond a boundary of the stable region of resonance, and the extraction quadrupole electromagnet unit is operated with appropriate timing as required for beam extraction so that the charged-particle beam is extracted with desired timing.
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15 Claims
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1. A charged-particle beam accelerator comprising:
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means for accelerating a charged-particle beam and circulating the charged-particle beam along an orbiting path; means for causing betatron oscillation of charged particles in a resonating state outside a stable region of resonance; means for increasing the amplitude of the betatron oscillation of the charged-particle beam within the stable region of resonance; and means for varying the stable region of resonance; wherein said means for increasing the amplitude of the betatron oscillation is controllably operated within a frequency range in which the circulating beam does not go beyond a boundary of the stable region of resonance, and said means for varying the stable region of resonance is controllably operated with appropriate timing as required for beam extraction so that the charged-particle beam is extracted with desired timing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification