Circular accelerator and particle beam therapy apparatus

A circular accelerator comprising:

• a beam deflector for beam injections adapted to inject a beam;
• beam betiding electromagnets for forming a circulation orbit by causing a beam injected from the beam deflector for beam injections to circulate;
• orbit adjusting electromagnets for adjusting orbit of an injected beam adapted to shift the position of each injected beam relative to center of the circulation orbit of the beam;
• beam extraction electromagnets adapted to adjust their respective quantities of magnetic excitation at time of extraction of a charged particle beam and operate to draw out a charged particle beam in a resonant region located off a stable region of charged particle beams;
• and
• a beam deflector for beam extractions adapted to draw out the beam extracted from the resonant region to outside;
• the circular accelerator being adapted to inject the beam from outer side and extract the beam to inner side of the circular accelerator.

A particle beam therapy apparatus comprising:

• a circular accelerator having:
• a beam deflector for beam injections adapted to inject a beam;
• beam bending electromagnets for forming a circulation orbit by causing a beam injected from the beam deflector for beam injections to circulate;
• orbit adjusting electromagnets for adjusting orbit of an injected beam adapted to shift the position of each injected beam relative to center of the circulation orbit of the beam;
• beam extraction electromagnets adapted to adjust their respective quantities of magnetic excitation at time of extraction of a charged particle beam and operate to draw out a charged particle beam in a resonant region located off a stable region of charged particle beams;
• and
• a beam deflector for beam extractions adapted to draw out the beam extracted from the resonant region to outside;
• a pre-accelerator arranged at inner side of the circular accelerator to accelerate the beam to be injected into the beam deflector for beam injections;
• and
• an irradiation device arranged at outer side of the circular accelerator to irradiate the beam extracted by the beam deflector for beam extractions onto a target of irradiation.

A particle beam therapy apparatus comprising:

• a circular accelerator having:
• a beam deflector for beam injections adapted to inject a beam;
• beam bending electromagnets for forming a circulation orbit by causing the beam injected from the beam deflector for beam injections to circulate;
• orbit adjusting electromagnets for adjusting orbit of an injected beam adapted to shift the position of each injected beam relative to center of the circulation orbit of the beam;
• beam extraction electromagnets adapted to adjust their respective quantities of magnetic excitation at time of extraction of a charged particle beam and operate to draw out a charged particle beam in a resonant region located off a stable region of charged particle beams;
• and
• a beam deflector for beam extractions adapted to draw out the beam extracted from the resonant region to outside;
• a pre-accelerator arranged at outer side of the circular accelerator to accelerate the beam to be injected into the beam deflector for beam injections;
• and
• an irradiation device arranged at inner side of the circular accelerator to irradiate the beam extracted by the beam deflector for beam extractions onto a target of irradiation.