Provided is an electromagnetic field control member including a first insulating member that is made of a ceramic having a tubular shape and includes a plurality of through holes extending in an axial direction; a conductive member made of a metal, the conductive member sealing off each of the through holes and leaving an opening portion in the through hole, the opening portion opening to an outer periphery of the first insulating member; a power feed terminal connected to the conductive member; and flanges respectively located at two ends of the first insulating member. A second insulating member made of a ceramic having a tubular shape is disposed on an outer peripheral side of the first insulating member, and includes two ends that are hermetically fixed to the flanges, respectively.

Provided is an electromagnetic field control member including a first insulating member that is made of a ceramic having a tubular shape and includes a plurality of through holes extending in an axial direction; a conductive member made of a metal, the conductive member sealing off each of the through holes and leaving an opening portion in the through hole, the opening portion opening to an outer periphery of the first insulating member; a power feed terminal connected to the conductive member; and flanges respectively located at two ends of the first insulating member. A second insulating member made of a ceramic having a tubular shape is disposed on an outer peripheral side of the first insulating member, and includes two ends that are hermetically fixed to the flanges, respectively.

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 particle beam adjustment device includes: a position monitor that detects a positional deviation of a particle beam transported from a beam transport section; an interlock device to interrupt irradiation of the particle beam when a positional deviation of the particle beam is detected by the position monitor; a pair of screen monitors that measure position and angle of an axis of the particle beam; a correction electromagnet that controls the axis of the particle beam by adjusting a magnetic field on a basis of a signal indicating the particle beam position and angle measured by the screen monitors; and a beam scanning electromagnet that irradiates an irradiation target with the particle beam. One of the screen monitors is installed outside a treatment room, and the other screen monitor and the position monitor are installed inside the treatment room.

A particle beam adjustment device includes: a position monitor that detects a positional deviation of a particle beam transported from a beam transport section; an interlock device to interrupt irradiation of the particle beam when a positional deviation of the particle beam is detected by the position monitor; a pair of screen monitors that measure position and angle of an axis of the particle beam; a correction electromagnet that controls the axis of the particle beam by adjusting a magnetic field on a basis of a signal indicating the particle beam position and angle measured by the screen monitors; and a beam scanning electromagnet that irradiates an irradiation target with the particle beam. One of the screen monitors is installed outside a treatment room, and the other screen monitor and the position monitor are installed inside the treatment room.

Disclosed a particle accelerator that accelerates a charged particle beam while circulating the charged particle beam as a circulating beam and outputs some of the circulating beam as an output beam, the particle accelerator including: a first deflection section and a second deflection sections each having a deflection electromagnet; a first straight section, a second straight section, and third straight section each not having the deflection electromagnet; and a control unit, wherein a preceding output deflector of the first straight section deflects some of the circulating beam toward an inner side of a circulating trajectory of the circulating beam to separate the some of the circulating beam as an output beam, wherein a succeeding output deflector of the third straight section deflects the output beam separated from the circulating beam by the preceding output deflector toward an outer side of the circulating trajectory of the circulating beam, and wherein the control unit controls at least the quadrupole electromagnet such that a phase advance of a betatron oscillation of the output beam is 270±45 degrees in a section from the preceding output deflector to the succeeding output deflector.

Disclosed a particle accelerator that accelerates a charged particle beam while circulating the charged particle beam as a circulating beam and outputs some of the circulating beam as an output beam, the particle accelerator including: a first deflection section and a second deflection sections each having a deflection electromagnet; a first straight section, a second straight section, and third straight section each not having the deflection electromagnet; and a control unit, wherein a preceding output deflector of the first straight section deflects some of the circulating beam toward an inner side of a circulating trajectory of the circulating beam to separate the some of the circulating beam as an output beam, wherein a succeeding output deflector of the third straight section deflects the output beam separated from the circulating beam by the preceding output deflector toward an outer side of the circulating trajectory of the circulating beam, and wherein the control unit controls at least the quadrupole electromagnet such that a phase advance of a betatron oscillation of the output beam is 270±45 degrees in a section from the preceding output deflector to the succeeding output deflector.

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.

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.