Circular accelerator and particle beam therapy system, how to operate the circular accelerator

摘要

PROBLEM TO BE SOLVED: To operate a circular accelerator, a particle beam therapy system, and a circular accelerator that accelerate a beam while increasing the orbital radius in a static magnetic field, which can control the emitted dose with high accuracy and improve the dose rate as compared with the conventional case. Provide a method. A beam is accelerated by using a static magnetic field and a frequency-modulated high-frequency accelerating electric field, and the beam is emitted to the circular accelerator 30 according to the amount of emitted beam for each energy of the beam emitted from the circular accelerator 30. The amount of incident beam or the amount of acceleration beam in the circular accelerator 30 is controlled, and a high-frequency electric field for emission is applied to a beam suitable for emission energy to emit the beam. [Selection diagram] Fig. 2