In a circular accelerator that applies a radiofrequency wave in a main magnetic field to accelerate charged particle beam while increasing an orbit radius, another radiofrequency wave with a frequency different from the radiofrequency wave used for acceleration is applied to the charged particle beam in order to extract the charged particle beam. Thereby, in the circular accelerator that accelerates charged particle beam while increasing an orbit radius by applying a radiofrequency wave in a main magnetic field, the high precision control on extraction of the charged particle beam from the circular accelerator is achieved.

A system and method for injecting an electron beam to an accelerator are provided. The system may include a cathode, an anode, and a modulation electrode. The cathode, for generating the electron beam, may have a first electrical potential. The anode may have a second electrical potential. The modulation electrode, located between the cathode and the anode, may be configured to adjust at least one parameter of the electron beam. The at least one parameter of the electron beam may include at least one transverse parameter of the electron beam.

In a circular accelerator that applies a radiofrequency wave in a main magnetic field to accelerate charged particle beam while increasing an orbit radius, another radiofrequency wave with a frequency different from the radiofrequency wave used for acceleration is applied to the charged particle beam in order to extract the charged particle beam. Thereby, in the circular accelerator that accelerates charged particle beam while increasing an orbit radius by applying a radiofrequency wave in a main magnetic field, the high precision control on extraction of the charged particle beam from the circular accelerator is achieved.

Provided is a technique by which each nuclide is optimized in terms of energy and number of particles and pre-accelerated so as to be injected into a main accelerator in charged particle beam irradiation by the combined use of different nuclides.

A charged particle beam injector includes: a first ion source that generates first nuclide ions; a first linear accelerator that linearly accelerates the generated first nuclide ions to form a first charged particle beam; a second ion source that generates second nuclide ions; a second linear accelerator that linearly accelerates the generated second nuclide ions to form a second charged particle beam; and a switching electromagnet that injects one of the first charged particle beam and the second charged particle beam into an inflector of a main accelerator.

An accelerator 4 includes a circular vacuum container including circular return yokes 5A, 5B. An injection electrode 18 is disposed closer to an inlet of a beam extraction path 20 in the return yoke 5B than a central axis C of the vacuum container. Magnetic poles 7A to 7F are radially disposed from the injection electrode 18 at the periphery of the injection electrode 18 in the return yoke 5B. Recessions 29A to 29F are disposed alternately with the magnetic poles 7A to 7F in the circumferential direction of the return yoke 5B. In the vacuum container, a concentric trajectory region, in which multiple beam turning trajectories centered around the injection electrode 18 are present, is formed, and an eccentric trajectory region, in which multiple beam turning trajectories eccentric from the injection electrode 18 are present, is formed around the region.

According to one embodiment, a particle beam accelerator comprising: a guiding unit configured to guide a particle beam to a trajectory; an acceleration unit configured to accelerate the particle beam circulating on the trajectory; a particle beam blocking unit configured to block the particle beam on the trajectory; and a control unit configured to control the guiding unit, the acceleration unit, and the particle beam blocking unit, wherein: the guiding unit includes a superconducting electromagnet and a superconducting electromagnet interrupter configured to interrupt the superconducting electromagnet, and the control unit is configured to interrupt the superconducting electromagnet by activating the superconducting electromagnet interrupter after completion of blocking the particle beam by activating the particle beam blocking unit, when an abnormality occurs in the superconducting electromagnet.

A particle acceleration system includes an ion source that generates an ion, an accelerator that accelerates the ion, And a transporting unit that transports the ion from the ion source to the accelerator, in which an attachment angle and an attachment position of the ion source with respect to the transporting unit are able to be adjusted.

In a circular accelerator that applies a radiofrequency wave in a main magnetic field to accelerate charged particle beam while increasing an orbit radius, another radiofrequency wave with a frequency different from the radiofrequency wave used for acceleration is applied to the charged particle beam in order to extract the charged particle beam. Thereby, in the circular accelerator that accelerates charged particle beam while increasing an orbit radius by applying a radiofrequency wave in a main magnetic field, the high precision control on extraction of the charged particle beam from the circular accelerator is achieved.

In a circular accelerator that applies a radiofrequency wave in a main magnetic field to accelerate charged particle beam while increasing an orbit radius, another radiofrequency wave with a frequency different from the radiofrequency wave used for acceleration is applied to the charged particle beam in order to extract the charged particle beam. Thereby, in the circular accelerator that accelerates charged particle beam while increasing an orbit radius by applying a radiofrequency wave in a main magnetic field, the high precision control on extraction of the charged particle beam from the circular accelerator is achieved.

A system and method for injecting an electron beam to an accelerator are provided. The system may include a cathode, an anode, and a modulation electrode. The cathode, for generating the electron beam, may have a first electrical potential. The anode may have a second electrical potential. The modulation electrode, located between the cathode and the anode, may be configured to adjust at least one parameter of the electron beam. The at least one parameter of the electron beam may include at least one transverse parameter of the electron beam.