Accelerator and particle therapy system
AssigneeHitachi High-Tech Corporation
InventorsChishin Hori, Takamitsu Hae
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Abstract
An object of the present invention is to speed up an operation of extracting an ion beam from an accelerator. An accelerator 100 includes an upper magnetic pole 8 and a lower magnetic pole 9 sandwiching an ion circulation space 10 in which ions circulate. At least one of the upper magnetic pole 8 and the lower magnetic pole 9 is formed such that a magnetic pole interval between the upper magnetic pole 8 and the lower magnetic pole 9 varies when the ion circulation space 10 is viewed along an ion beam trajectory. That is, a wide interval region 11 having a larger magnetic pole interval than a peripheral region is formed in a region closer to a center point of the ion circulation space 10 than a center point of the ion beam trajectory.
Claims14
An accelerator comprising
- an upper magnetic pole and a lower magnetic pole sandwiching an ion circulation space in which ions circulate,
- wherein the accelerator is configured such that there are spatial magnetic field variations when the ion circulation space is viewed along an ion beam trajectory, and
- the magnetic field variations are spatial magnetic field variations that displace ions such that an amount of displacement in an outward direction at an ion extraction operating point is larger for ions having smaller energy.
An accelerator comprising
- an upper magnetic pole and a lower magnetic pole sandwiching an ion circulation space in which ions circulate,
- wherein the accelerator is configured such that there are spatial magnetic field variations when the ion circulation space is viewed along an ion beam trajectory, and
- a magnetic field evaluation value along the ion beam trajectory in a region closer to a center point of the ion circulation space than to a center point of the ion beam trajectory is smaller than a magnetic field evaluation value along the ion beam trajectory in a region closer to an ion extraction operating point than to the center point of the ion beam trajectory.
An accelerator comprising
- an upper magnetic pole and a lower magnetic pole sandwiching an ion circulation space in which ions circulate,
- wherein at least one of the upper magnetic pole and the lower magnetic pole is formed such that a magnetic pole interval between the upper magnetic pole and the lower magnetic pole varies when the ion circulation space is viewed along an ion beam trajectory.
Dependencies are inferred from the claim text.