Abstract: A charged particle beam irradiation equipment enable to reduce the cost in case of irradiating the beam to the target object in plural directions.

Abstract: The accelerator is a cyclic type accelerator having deflection electromagnets and four-pole electromagnets for making a charged particle beam circulate, a multi-pole electromagnet for generating a stability limit of resonance of betatron oscillation for the production of the charged particle beam, and a high frequency source for applying a high frequency electromagnetic field to the beam to move the beam to the outside of the stability limit, thus exciting resonance in the betatron oscillation. The high frequency source generates a sum signal of a plurality of AC signals of which the instantaneous frequencies change with respect to time, and of which the average values of the instantaneous frequencies with respect to time are different, and applies the sum signal via electrodes to the beam.

Abstract: A method of irradiation with a charged particle beam and an irradiation apparatus wherein the charged particle beam supplied from an accelerator and extracted from the irradiation apparatus. The irradiation apparatus includes an electromagnet for scanning with the charged particle beam. The method includes the steps of stopping the extraction of the charged particle beam from the irradiation apparatus, changing an irradiation point of the charged particle beam by controlling the electromagnet under a condition when the extraction is stopped, and resuming the extraction of the charged particle beam from the irradiation apparatus after changing the irradiation point.

Abstract: A charged-particle beam irradiation method and system are disclosed in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of the charged-particle beam is irradiated with the charged-particle beam. The intensity of a charged-particle beam for irradiation of a first layer is made lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than the first layer in the beam progressing direction. A scanning speed in the first layer is changed between a portion of the first layer subjected to irradiation at the time of irradiation of the second layer and a portion of the first layer subjected to no irradiation at the time of irradiation of the second layer.

Abstract: An electromagnet comprises a pair of magnetic pole 1a and 1b, a return yoke 3, exciting coils 4 and 5, etc. In an interior portion of a magnetic pole, plural spacers 2a-2g are provided putting side by side in a horizontal direction. Each of the spaces 2a-2g is an air layer and a longitudinal cross-section is a substantially rectangular shape and the space has a lengthily extending slit shape in a vertical direction against a paper face in FIG. 1. The plural spaces are mainly arranged toward a right side from a beam orbit center O and an interval formed between adjacent spaces is narrower toward the right side. The electromagnet having a simple magnetic pole structure and a wide effective magnetic field area in a case where a maximum magnetic field strength is increased can be secured.

Abstract: A charged-particle beam irradiation method and system are disclosed in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of the charged-particle beam is irradiated with the charged-particle beam. The intensity of a charged-particle beam for irradiation of a first layer is made lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than the first layer in the beam progressing direction. A scanning speed in the first layer is changed between a portion of the first layer subjected to irradiation at the time of irradiation of the second layer and a portion of the first layer subjected to no irradiation at the time of irradiation of the second layer.

Abstract: An electromagnet comprises a pair of magnetic pole 1a and 1b, a return yoke 3, exciting coils 4 and 5, etc. In an interior portion of a magnetic pole, plural spacers 2a-2g are provided putting side by side in a horizontal direction. Each of the spaces 2a-2g is an air layer and a longitudinal cross-section is a substantially rectangular shape and the space has a lengthily extending slit shape in a vertical direction against a paper face in FIG. 1. The plural spaces are mainly arranged toward a right side from a beam orbit center O and an interval formed between adjacent spaces is narrower toward the right side. The electromagnet having a simple magnetic pole structure and a wide effective magnetic field area in a case where a maximum magnetic field strength is increased can be secured.

Abstract: A charged particle beam irradiation apparatus for irradiating a target with a charged particle beam emitted from an accelerator includes a plurality of scanning electromagnets, and a quadrupole electromagnet is used between two of the plurality of the scanning electromagnets.

Abstract: A synchrotron type accelerator including a deflecting electromagnet arranged on a circulating orbit of a charged particle beam, four-pole divergence electromagnets and four-pole convergence electromagnets arranged on said circulating orbit. A high frequency applying unit arranged on the circulating orbit for applying a high frequency electromagnetic field to the charged particle beam circulating and for increasing an amplitude of betatron oscillation of the particle beam to a level above a stability limit of resonance. A first deflector for beam ejection arranged on the circulating orbit for deflecting the charged particle beam excited above the stability limit of the resonance by the high frequency applying unit and a second deflector for beam ejection arranged on the circulating orbit used in pairs with the first deflector for beam ejection for introducing the charged particle beam deflected by the first deflector for beam ejection into an ejected beam transporting system.

Abstract: A charged particle beam irradiation system includes a beam spreading device, a ridge filter, a range shifter, a collimator, and a bolus. Further, on a supporting plate in the ridge filter, a plurality of ridge components are arranged, and shielding elements are attached at the top parts of a part of the plurality of the ridge components.

Abstract: An object of the present invention is to provide a small synchrotron type accelerator and a medical treatment system employing the same. In order to attain this object, according to the present invention, a synchrotron type accelerator includes: a deflecting electromagnet which is arranged on a circulating orbit of a charged particle beam; a first deflector for beam ejection by which the charged particle beam turning along the circulating orbit is deflected; and a second deflector for beam ejection which is used in pairs with the first deflector for beam ejection and by which the charged particle beam which has been deflected by the first deflector for beam ejection is introduced into an ejected beam transporting system, wherein both the deflecting electromagnet and the second deflector for beam ejection are arranged in this order downstream with respect to the first deflector for beam ejection.

Abstract: A charged particle irradiation apparatus, which is capable of decreasing a lateral dose falloff at boundaries of irradiation field of charged particle beam, and reducing the size of the charged particle irradiation apparatus, is provided by controlling magnetic fields of quadrupole electromagnets 1-5 and deflection electromagnets 6-8 so that center of the charged particle beam passes always center of a scatterer irrespective of direction and intensity of a magnetic field generated by scanning electromagnets 50, 60.

Abstract: A charged particle beam apparatus and a method having a reduced loss of the charged particle beam such as a shape of affected part, irradiation positions in a horizontal direction. An interval between the irradiation positions in the horizontal direction is desirably designated as smaller than a half of the charged particle beam size enlarged by a scatterer. A control unit controls a power source of electromagnets in order to change an irradiation position during stopping extraction of the charged particle beam. An affected part is irradiated with the charged particle beam per respective irradiation position. An irradiation target can be irradiated uniformly with the charged particle beam by overlapping the charged particle beam, because the irradiation dose of the charged particle beam enlarged by the scatterer has a Gaussian distribution in a radial direction centered at the irradiation position.

Abstract: In a radio-frequency accelerating system, a loop antenna is coupled with at least one of a plurality of magnetic core groups each including a plurality of magnetic cores or with at least one of the plurality of magnetic cores, and an impedance adjusting means is connected to the loop antenna. A relatively low voltage is applied to the impedance adjusting means. Therefore, the impedance adjusting means may be a circuit element having a low withstand voltage and hence the radio-frequency accelerating system can be formed to have a small construction.

Abstract: The present invention is to provide a method and an apparatus which are able to inject large electric current to a circular accelerator. In order to inject large electric current, that is, a large number of charged particles, a means is provided for injecting a beam into other region of a vacuum duct than the region which is defined as having a height equivalent to the height of the injected beam and a width from the injected point in the vacuum duct to the symmetrical point to the injected point with respect to the geometrical center of the vacuum duct.

Abstract: The present invention provides apparatus for acceleration of a charged particle beam which includes energy means for altering the energy of a circulating beam circulating in the apparatus and means for extracting output beams from the apparatus. Control means are arranged to be operable to alter the energy of the circulating beam using the energy means so as to be able to extract output beams of at least two energies from the apparatus using the means for extracting. Thus there is provided an accelerator, and an extraction method therefor, which is capable of extracting a small diameter beam having a varying energy level. This facilitates improved medical irradiation treatment using the beam.

Abstract: A beam transfer system has a bending magnet, a quadrupole magnet for converging or diverging a beam, and a beam current monitor. The controller of an accelerator body for the beam transfer system has a beam current measuring apparatus, a quantity-of-control measuring apparatus for measuring a quantity of control such as an exciting current of a bending magnet, a quantity-of-control determining apparatus for determining the quantity of control of each component, a trigger generating apparatus for generating various trigger signals, and a main controller for determining the quantity of control and the control timing of every component.

Abstract: The present invention is to provide a method and an apparatus which are able to inject a large amount of charged particles to a circular accelerator. In order to inject a large number of charged particles, the charged particle beams are injected into a region of a vacuum duct other than the region which is defined as having a height equivalent to the height of the injected beam and a width from the injected point in the vacuum duct to the symmetrical point to the injected point with respect to the geometrical center of the vacuum duct.

Abstract: A circular accelerator is arranged to circulate a charged particle beam through a bending function provided by a bending magnet, set a tune of the charged particle beam being circulated as it is betatron-oscillated to a predetermined value through the effect of a quadrupole magnetic field, resonate the charged particle beam being circulated at the tune set to the predetermined value in a manner to increase an amplitude of the betatron oscillations over the stability limit of resonance, thereby extracting the charged particle beam. The circular accelerator includes a bending magnet formed to generate a quadrupole magnetic field component for horizontally focusing the charged particle beam being circulated and vertically defocusing the beam and another bending magnet formed to generate a quadrupole magnetic field component for horizontally defocusing the charged particle beam being circulated and vertically focusing the beam.

Abstract: A small-sized circular accelerator capable of generating radiation of high brightness, an operation method of the circular accelerator, and a semiconductor irradiation system capable of using radiation of high brightness. An electron beam emitted from a pre-accelerator is injected to the inside of the storage ring by an injector, and accelerated and stored. Thereafter, each of insertion devices respectively disposed in linear orbit sections between main bending magnets and auxiliary bending magnets are excited to generate an alternating field therein. A meandering or spiral movement of the electron beam is caused by this alternating field. By superposing radiations emitted from vertexes of the meandering orbit or the spiral orbit, radiation having high brightness is generated.