A radiation treatment apparatus includes an accelerator that emits a charged particle beam, a time measurement unit that measures an emission time of the charged particle beam of the accelerator, a first control unit that controls the accelerator based on the emission time measured by the time measurement unit, and an emission determination unit that determines whether or not the accelerator is emitting the charged particle beam while the first control unit is controlling the accelerator. The time measurement unit adds a time, for which a result of a determination performed by the emission determination unit is that the accelerator is emitting the charged particle beam, to the emission time and does not add a time, for which the result of the determination performed by the emission determination unit is that the accelerator is not emitting the charged particle beam, to the emission time.

A radiation treatment apparatus includes an accelerator that emits a charged particle beam, a time measurement unit that measures an emission time of the charged particle beam of the accelerator, a first control unit that controls the accelerator based on the emission time measured by the time measurement unit, and an emission determination unit that determines whether or not the accelerator is emitting the charged particle beam while the first control unit is controlling the accelerator. The time measurement unit adds a time, for which a result of a determination performed by the emission determination unit is that the accelerator is emitting the charged particle beam, to the emission time and does not add a time, for which the result of the determination performed by the emission determination unit is that the accelerator is not emitting the charged particle beam, to the emission time.

A particle accelerator including an electrical field system and a magnetic field system that are configured to direct a particle beam of charged particles along a designated path within an acceleration chamber. The particle accelerator also includes a foil holder having a beam window and a positioning slot that at least partially surrounds the beam window. The positioning slot is dimensioned to hold an extraction foil such that the extraction foil extends across the beam window and into the path of the charged particles. The positioning slot is defined by interior reference surfaces that face the extraction foil and retain the extraction foil within the positioning slot. The reference surfaces permit the extraction foil to move relative to the reference surfaces when the particle beam is incident on the extraction foil.

A particle accelerator including an electrical field system and a magnetic field system that are configured to direct a particle beam of charged particles along a designated path within an acceleration chamber. The particle accelerator also includes a foil holder having a beam window and a positioning slot that at least partially surrounds the beam window. The positioning slot is dimensioned to hold an extraction foil such that the extraction foil extends across the beam window and into the path of the charged particles. The positioning slot is defined by interior reference surfaces that face the extraction foil and retain the extraction foil within the positioning slot. The reference surfaces permit the extraction foil to move relative to the reference surfaces when the particle beam is incident on the extraction foil.

When controlling the ejection of a charged particle beam from a synchrotron, a radiofrequency voltage is applied, which serves as the radio-frequency voltage to be applied to an ejection radio-frequency electrode equipping the synchrotron, and which is constituted by a first radio-frequency voltage for increasing an oscillation amplitude in such a way as to exceed a stable limit in order to eject to the exterior of the synchrotron a beam that circles inside the synchrotron, and a second radio-frequency voltage for preferentially ejecting a charged particle beam that circles in the vicinity of the stable limit, with the amplitude value of the second radiofrequency voltage being controlled in such a way that the amplitude value is 0 prior to the beam ejection start, the amplitude value increases gradually from the beam ejection start, and, once a predetermined amplitude value has been reached, this value is maintained.

When controlling the ejection of a charged particle beam from a synchrotron, a radiofrequency voltage is applied, which serves as the radio-frequency voltage to be applied to an ejection radio-frequency electrode equipping the synchrotron, and which is constituted by a first radio-frequency voltage for increasing an oscillation amplitude in such a way as to exceed a stable limit in order to eject to the exterior of the synchrotron a beam that circles inside the synchrotron, and a second radio-frequency voltage for preferentially ejecting a charged particle beam that circles in the vicinity of the stable limit, with the amplitude value of the second radiofrequency voltage being controlled in such a way that the amplitude value is 0 prior to the beam ejection start, the amplitude value increases gradually from the beam ejection start, and, once a predetermined amplitude value has been reached, this value is maintained.

There is provided a cyclotron which accelerates a charged particle in an orbital trajectory to emit a charged particle beam. The cyclotron includes a magnetic pole that generates a magnetic field required for accelerating the charged particle, and a magnetic channel portion having a magnetic channel disposed on an outer peripheral portion of the orbital trajectory to guide the charged particle beam to an extraction trajectory and to focus the charged particle beam. The magnetic channel portion is attached to the magnetic pole.

According to one embodiment, a particle beam accelerator comprising: an injection unit configured to inject a particle beam; a guiding unit configured to guide the particle beam to a trajectory; an acceleration unit configured to accelerate the particle beam circulating on the trajectory; an emission unit configured to output the particle beam; a particle beam blocking unit configured to block the particle beam on the trajectory; a control unit configured to control the injection unit, the guiding unit, the acceleration unit, the emission 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, the control unit is configured to change a starting sequence of the particle beam blocking unit and the superconducting electromagnet interrupter depending on at least an operating state of the emission unit, when an abnormality occurs in the superconducting electromagnet.

According to one embodiment, a particle beam accelerator comprising: an injection unit configured to inject a particle beam; a guiding unit configured to guide the particle beam to a trajectory; an acceleration unit configured to accelerate the particle beam circulating on the trajectory; an emission unit configured to output the particle beam; a particle beam blocking unit configured to block the particle beam on the trajectory; a control unit configured to control the injection unit, the guiding unit, the acceleration unit, the emission 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, the control unit is configured to change a starting sequence of the particle beam blocking unit and the superconducting electromagnet interrupter depending on at least an operating state of the emission unit, when an abnormality occurs in the superconducting electromagnet.

Embodiments of the present invention describe systems and methods for providing proton therapy treatment using a beam line where the ESS is reduced or eliminated. For multi-room configurations, a beam line is included having quadrupole and steerer magnets to align and focus a particle beam extracted by an accelerator and guided by a bend section. A degrader is disposed between the bend section and the treatment room, and the energy analyzing functionality is performed by the gantry.