System for irradiating charged particles and method for irradiating charged particles

A charged particle irradiation system comprising:

• a charged particle beam generator that repeats injection of charged particles, acceleration of the charged particles to an extractable state after finishing the acceleration, and deceleration of the charged particles;
• and
• a control system that controls extraction of a charged particle beam of the charged particles in accordance with an extraction permission state that is associated with a state variation of an irradiation object and that maintains the extractable state of the charged particles after extraction is stopped based on the extraction permission state in association with the state variation of the irradiation object.

A charged particle irradiation method comprising:

• generating a charged particle beam;
• controlling extraction of the charged particle beam in accordance with an extraction permission state that is associated with a state variation of an irradiation object;
• when extraction of the charged particle beam is stopped in association with the state variation of the irradiation object which is irradiated with the charged particle beam, controlling the generation of the charged particle beam to maintain an extractable state which can start the irradiation of the irradiation object beam based on the extraction permission state in association with the state of variation of the irradiation object.

A charged particle irradiation system comprising:

• a charged particle beam generator that generates a charged particle beam;
• and
• a control system that controls the charged particle beam generator including extraction of the charged particle beam in accordance with an extraction permission state that is associated with a state variation of an irradiation object, and after an extraction of the charged particle beam is stopped in association with the state variation of the irradiation object which is irradiated with the charged particle beam, the charged particle beam generator is controlled so that the charged particle beam is kept ready for extraction based on the extraction permission state in association with the state of variation of the irradiation object.