Abstract: An isotope production system that includes a cyclotron having a magnet yoke that surrounds an acceleration chamber. The cyclotron is configured to direct a particle beam from the acceleration chamber through the magnet yoke. The isotope production system also includes a target system that is located proximate to the magnet yoke. The target system is configured to hold a target material and includes a radiation shield that extends between the magnet yoke and the target location. The radiation shield is sized and shaped to attenuate gamma rays emitted from the target material toward the magnet yoke. The isotope production system also includes a beam passage that extends from the acceleration chamber to the target location. The beam passage is at least partially formed by the magnet yoke and the radiation shield of the target system.

Abstract: The present invention relates to an irradiation unit for emitting a particle beam, a gantry including the irradiation unit, a squirrel cage structure located within and supported by the gantry, a frame arranged so as to be motionless, a moving floor including a plurality of elongated members forming a primary caterpillar, two moving floor guide units having a truncated circle shape, facing each other, attached to said squirrel cage structure and the motionless frame, respectively. Each of the two moving floor guide units includes at least a first rail, said the primary caterpillar being slidably arranged on the first rail. Each moving floor guide unit includes at least a second rail having a truncated circle shape and the moving floor includes at least one secondary caterpillar including elongated members flexibly connected to each other.

Abstract: A betatron magnet, the betatron magnet comprising at least one electron injector positioned approximate an inside of a radius of an betatron orbit, such that electrons are injected into the betatron orbit with the at least one electron injector positioned within an electron acceleration passageway, whereby the electron acceleration passageway is located within a vacuum chamber; and wherein the at least one electron injector is driven with an inductive means.

Abstract: A compact, cold, superconducting isochronous cyclotron can include at least two superconducting coils on opposite sides of a median acceleration plane. A magnetic yoke surrounds the coils and a portion of a beam chamber in which ions are accelerated. A cryogenic refrigerator is thermally coupled both with the superconducting coils and with the magnetic yoke. The superconducting isochronous cyclotron also includes sector pole tips that provide strong focusing; the sector pole tips can have a spiral configuration and can be formed of a rare earth magnet. The sector pole tips can also be separated from the rest of the yoke by a non-magnetic material. In other embodiments, the sector pole tips can include a superconducting material. The spiral pole tips can also include cut-outs on a back side of the sector pole tips remote from the median acceleration plane.

Abstract: A system includes a patient support and an outer gantry on which an accelerator is mounted to enable the accelerator to move through a range of positions around a patient on the patient support. The accelerator is configured to produce a proton or ion beam having an energy level sufficient to reach a target in the patient. An inner gantry includes an aperture for directing the proton or ion beam towards the target.

Abstract: The present invention relates to a cyclotron including two internal ion sources for the production of the same particles. The second ion source can be used as a spare ion source which strongly increases the uptime and the reliability of the cyclotron and reduces the maintenance interventions. Advantageously, the cyclotron is further characterized by an optimized close geometry of the different elements within the central region of the cyclotron. The cyclotron of the invention may be further characterized by an adaptation and optimization of the shape of first and second internal ion source to avoid particle losses during the first turn of acceleration. The cyclotron may be further characterized by an adaptation and optimization of the shape of the counter-Dee electrode assembly and possibly the Dee-electrode assembly in order to improve the acceleration field in-between the gaps.

Abstract: The circular accelerator comprises: a bending electromagnet that generates a bending magnetic field; a radio-frequency power source that generates a radio-frequency electric field in accordance with an orbital frequency of charged particles; a radio-frequency electromagnetic field coupling part connected to the radio-frequency power source; an acceleration electrode connected to the radio-frequency electromagnetic field coupling part; and an acceleration-electrode-opposing ground plate provided to form an acceleration gap between the plate itself and the acceleration electrode, for generating the radio-frequency electromagnetic field in an orbiting direction of the charged particles; wherein the bending electromagnet generates the bending magnetic field varying in such a way that the orbital frequency of the charged particles varies in a variation range of 0.7% to 24.7% with respect to an orbital frequency at the charged-particles' extraction portion, during a time of injection to extraction of the particles.

Abstract: A dc accelerator system able to accelerate high currents of proton beams at high energies is provided. The accelerator system includes a dc high-voltage, high-current power supply, an evacuated ion accelerating tube, a proton ion source, a dipole analyzing magnet and a vacuum pump located in the high-voltage terminal. The high-current, high-energy dc proton beam can be directed to a number of targets depending on the applications such as boron neutron capture therapy BNCT applications, NRA applications, and silicon cleaving.

Abstract: A compact, cold, weak-focusing superconducting cyclotron can include at least two superconducting coils on opposite sides of a median acceleration plane. A magnetic yoke surrounds the coils and contains an acceleration chamber. The magnetic yoke is in thermal contact with the superconducting coils, and the median acceleration plane extends through the acceleration chamber. A cryogenic refrigerator is thermally coupled both with the superconducting coils and with the magnetic yoke.

Abstract: An ion radiation therapy machine provides a steerable beam for treating a tumor within the patient where the exposure spot of the beam is controlled in width and/or length to effect a flexible trade-off between treatment speed, accuracy, and uniformity.

Abstract: A cyclotron that includes a magnet yoke having a yoke body that surrounds an acceleration chamber. The cyclotron also includes a magnet assembly to produce magnetic fields to direct charged particles along a desired path. The magnet assembly is located in the acceleration chamber. The magnetic fields propagate through the acceleration chamber and within the magnet yoke, wherein a portion of the magnetic fields escapes outside of the magnet yoke as stray fields. The cyclotron also includes a vacuum pump that is coupled to the yoke body. The vacuum pump is configured to introduce a vacuum into the acceleration chamber. The magnet yoke is dimensioned such that the vacuum pump does not experience magnetic fields in excess of 75 Gauss.

Abstract: A synchrocyclotron comprises a resonant circuit that includes electrodes having a gap therebetween across the magnetic field. An oscillating voltage input, having a variable amplitude and frequency determined by a programmable digital waveform generator generates an oscillating electric field across the gap. The synchrocyclotron can include a variable capacitor in circuit with the electrodes to vary the resonant frequency. The synchrocyclotron can further include an injection electrode and an extraction electrode having voltages controlled by the programmable digital waveform generator. The synchrocyclotron can further include a beam monitor. The synchrocyclotron can detect resonant conditions in the resonant circuit by measuring the voltage and or current in the resonant circuit, driven by the input voltage, and adjust the capacitance of the variable capacitor or the frequency of the input voltage to maintain the resonant conditions.

Abstract: A cyclotron that includes a magnet yoke that has a yoke body that surrounds an acceleration chamber and a magnet assembly. The magnet assembly is configured to produce magnetic fields to direct charged particles along a desired path. The magnet assembly is located in the acceleration chamber. The magnetic fields propagate through the acceleration chamber and within the magnet yoke. A portion of the magnetic fields escape outside of the magnet yoke as stray fields. The magnet yoke is dimensioned such that the stray fields do not exceed 5 Gauss at a distance of 1 meter from an exterior boundary.

Abstract: A cyclotron that includes a magnet assembly to produce a magnetic field to direct charged particles along a desired path. The cyclotron also includes a magnet yoke that has a yoke body that surrounds an acceleration chamber. The magnet assembly is located in the yoke body. The yoke body forms a pump acceptance (PA) cavity that is fluidicly coupled to the acceleration chamber. The cyclotron also includes a vacuum pump that is configured to introduce a vacuum into the acceleration chamber. The vacuum pump is positioned in the PA cavity.

Abstract: An accelerator that can accelerate by itself all ions up to any energy level allowed by the magnetic fields for beam guiding, and provides an all-ion accelerator in which with trigger timing and a charging time of an induced voltage applied to an ion beam injected from a preinjector by induction cells for confinement and acceleration used in an induction synchrotron, digital signal processors for confinement and acceleration and pattern generators for confinement and acceleration generate gate signal patterns for confinement and acceleration on the basis of a passage signal of the ion beam and an induced voltage signal for indicating the value of the induced voltage applied to the ion beam, and intelligent control devices for confinement and acceleration perform feedback control of on/off of the induction cells for confinement and acceleration.

Abstract: An ion therapy system comprises a particle accelerator (1) mounted on a rotatable gantry (2). The particle accelerator includes a superconducting coil (17) which rotates about its axis as the particle accelerator rotates about the gantry axis in use to direct an output beam towards a target from different directions. The particle accelerator is rotatable through (180) degrees to move the beam through a corresponding arc. The particle accelerator includes cooling system arranged to cool the coil as the coil rotates. The superconducting coil (17) is mounted in a coil support (25). The coil is surrounded by a cryogen chamber (32) which is located radially outwardly from the coil (17) on the other side of the support (25). The cryogen chamber is in fluid communication with a cryogen recondensing unit (29) whereby vaporized cryogen may flow from the cryogen chamber (32) to the cryogen recondensing unit (29) to be recondensed in use before returning to the cryogen chamber.

Abstract: The present invention relates to an irradiation device for irradiating an irradiation object with heavy charged particles at an irradiation station, comprising a particle accelerator for providing a particle beam and a swivelling device for swivelling the particle beam impinging on the irradiation object, wherein the swivelling device comprises a carrier pivotable about an axis. In accordance with the invention, the irradiation device is characterized in that the particle accelerator is mounted on the pivotable carrier.

Abstract: An electromagnetic field generator includes a semiconductive material shaped to form a complex electromagnetic field including a magnetic field and an electric field. An instrument includes a passage configured such that charged particle may travel therein, and a semiconductive material configured to form a complex electromagnetic field that is configured to control motion of the charged particles within the passage. Another instrument includes a housing defining a chamber, and an electromagnetic field generator within the chamber that comprises a material configured to form an electric field component of an electromagnetic field, and a material configured to form a magnetic field component of the electromagnetic field. A method of controlling motion of charged particles includes controlling motion of at least one charged particle by forming a complex electromagnetic field with a semiconductive material that is shaped to form the complex electromagnetic field.

Abstract: An apparatus of an electron cyclotron resonance ion source may include: a magnet unit containing a magnet for generating magnetic fields; an ionizing chamber housing unit for generating ions through electron cyclotron resonance from a plasma; a microwave generating unit for injecting microwaves to the ionizing chamber housing unit to generate ions; and a beam integrating and guiding unit for treating the generated ions. The magnet unit may include: a bobbin for winding the magnet; a variable spacer for dividing the bobbin into a plurality of sections; and the magnet which is wound into the form of a wire or a tape in the plurality of sections formed by the variable spacer.

Abstract: A stacked conformation radiotherapy system capable of homogenizing a radiation dose distribution, including an irradiation head and irradiation control means. The irradiation head projects a particle beam accelerated by an accelerator, toward an object to-be-irradiated, and it includes wobbler electromagnets for deflecting and scanning the particle beam. In carrying out stacked conformation radiotherapy by deflecting and scanning the particle beam, the irradiation control means subjects the wobbler electromagnets to magnetization controls so that the particle beam may depict a one-stroke revolving orbit which begins with a start point and returns to the start point, and it performs a control so that the irradiation period of the particle beam to be outputted from the irradiation head may become integral times a wobbler cycle which is required for the particle beam to make one revolution of the revolving orbit.

Abstract: The present invention relates to a cyclotron including two internal ion sources for the production of the same particles. The second ion source can be used as a spare ion source which strongly increases the uptime and the reliability of the cyclotron and reduces the maintenance interventions. Advantageously, the cyclotron is further characterized by an optimized close geometry of the different elements within the central region of the cyclotron. The cyclotron of the invention may be further characterized by an adaptation and optimization of the shape of first and second internal ion source to avoid particle losses during the first turn of acceleration. The cyclotron may be further characterized by an adaptation and optimization of the shape of the counter-Dee electrode assembly and possibly the Dee-electrode assembly in order to improve the acceleration field in-between the gaps.

Abstract: A particle beam generator has a vacuum chamber, a magnet which generates a constant magnetic field in the vacuum chamber, acceleration electrodes which generates a magnetic field in a direction perpendicular to the direction of the magnetic field generated by the magnet in the vacuum chamber, a take-out electrode which takes out charged particles accelerated in the vacuum chamber; and a target cell provided at a position at which the charged particles taken out by the taken-out electrode strikes. At least a part of surfaces exposed to the charged particles of the vacuum chamber, the acceleration electrodes, the take-out electrode and/or the target cell is made of a material including an element having atomic number larger than copper.

Abstract: The invention relates to a method for designing a radio-frequency cavity, in particular to be used in a cyclotron, radio-frequency cavity (2) comprising a conductive enclosure or “liner” (3) connected by at least two essentially inductive elements or “stems” (4) to a capacitive electrode (2?), the method being characterized in that it comprises the following subsequent steps: A. subdividing the volume of said radio-frequency cavity (2) in a number of sub-cavities (10,20,30) corresponding to at least two stems (4), each sub-cavity comprising a respective (stem4); B. imposing a condition of magnetic orthonormality on the separation surfaces between said at least two sub-cavities (10,20,30); C. independently for each of said at least two sub-cavities (10,20,30), calculating the size and/or the position of the respective stem (4) with respect to the physical conditions at the boundaries.

Abstract: A cyclotron that includes a magnet yoke that has a yoke body that surrounds an acceleration chamber and a magnet assembly. The magnet assembly is configured to produce magnetic fields to direct charged particles along a desired path. The magnet assembly is located in the acceleration chamber. The magnetic fields propagate through the acceleration chamber and within the magnet yoke. A portion of the magnetic fields escape outside of the magnet yoke as stray fields. The magnet yoke is dimensioned such that the stray fields do not exceed 5 Gauss at a distance of 1 meter from an exterior boundary.

Abstract: A cyclotron that includes a magnet yoke having a yoke body that surrounds an acceleration chamber. The cyclotron also includes a magnet assembly to produce magnetic fields to direct charged particles along a desired path. The magnet assembly is located in the acceleration chamber. The magnetic fields propagate through the acceleration chamber and within the magnet yoke, wherein a portion of the magnetic fields escapes outside of the magnet yoke as stray fields. The cyclotron also includes a vacuum pump that is coupled to the yoke body. The vacuum pump is configured to introduce a vacuum into the acceleration chamber. The magnet yoke is dimensioned such that the vacuum pump does not experience magnetic fields in excess of 75 Gauss.

Abstract: A cyclotron that includes a magnet assembly to produce a magnetic field to direct charged particles along a desired path. The cyclotron also includes a magnet yoke that has a yoke body that surrounds an acceleration chamber. The magnet assembly is located in the yoke body. The yoke body forms a pump acceptance (PA) cavity that is fluidicly coupled to the acceleration chamber. The cyclotron also includes a vacuum pump that is configured to introduce a vacuum into the acceleration chamber. The vacuum pump is positioned in the PA cavity.

Abstract: To ensure irradiation accuracy and safety, even when an irradiation device employing a different irradiation method is used, disclosed is herein a charged particle beam irradiation apparatus that irradiates an irradiation target with charged particle beams includes: a charged particle beam generator for generating the charged particle beams; a passive scattering irradiation device and a scanning irradiation device, both for irradiating the irradiation target with the charged particle beams; a beam transport system for transporting the charged particles beam extracted from the charged particle beam generator, to selected one of the two irradiation devices; and a central controller that modifies operating parameters on the charged particle beam generator, according to the irradiation method adopted for the selected irradiation device.

Abstract: The magnetic field in an acceleration chamber defined by a magnet structure is shaped by shaping the poles of a magnetic yoke and/or by providing additional magnetic coils to produce a magnetic field in the median acceleration plane that decreases with increasing radial distance from a central axis. The magnet structure is thereby rendered suitable for the acceleration of charged particles in a synchrocyclotron. The magnetic field in the median acceleration plane is “coil-dominated,” meaning that a strong majority of the magnetic field in the median acceleration plane is directly generated by a pair of primary magnetic coils (e.g., superconducting coils) positioned about the acceleration chamber, and the magnet structure is structured to provide both weak focusing and phase stability in the acceleration chamber. The magnet structure can be very compact and can produce particularly high magnetic fields.

Abstract: A medical device can perform treatment and diagnosis without causing a sense of unease to the patient. The medical device includes a substantially ring-shaped support frame provided in such a manner that a central axis through which an isocenter passes is disposed substantially horizontally; a substantially ring-shaped moving gantry which slides relative to the support frame and which has an opening at the isocenter side thereof a radiation emitter configured to emit a beam towards the isocenter; and a protective cover which covers the radiation emitter and an inner circumferential side of the moving gantry and which moves together with the moving gantry.

Abstract: A synchrocyclotron comprises a resonant circuit that includes electrodes having a gap therebetween across the magnetic field. An oscillating voltage input, having a variable amplitude and frequency determined by a programmable digital waveform generator generates an oscillating electric field across the gap. The synchrocyclotron can include a variable capacitor in circuit with the electrodes to vary the resonant frequency. The synchrocyclotron can further include an injection electrode and an extraction electrode having voltages controlled by the programmable digital waveform generator. The synchrocyclotron can further include a beam monitor. The synchrocyclotron can detect resonant conditions in the resonant circuit by measuring the voltage and or current in the resonant circuit, driven by the input voltage, and adjust the capacitance of the variable capacitor or the frequency of the input voltage to maintain the resonant conditions.

Abstract: In a particle beam irradiation method and a particle beam irradiation apparatus in which depth direction irradiation field spread and lateral direction irradiation field spread are performed, an irradiation dose in each of the irradiation layers of an irradiation target is made substantially constant, the control is simplified, and the irradiation error by the displacement of the irradiation target is reduced. The depth direction irradiation field spread is an active irradiation field spread to superimpose plural irradiation layers having different ranges in the irradiation direction of the particle beam. A bolus having a shape along a deepest part of the irradiation target in the depth direction is disposed to cross the particle beam. At least one irradiation layer selected from the plural irradiation layers is re-irradiated one or more times with the particle beam.

Abstract: A synchrocyclotron comprises a resonant circuit that includes electrodes having a gap therebetween across the magnetic field. An oscillating voltage input, having a variable amplitude and frequency determined by a programmable digital waveform generator generates an oscillating electric field across the gap. The synchrocyclotron can include a variable capacitor in circuit with the electrodes to vary the resonant frequency. The synchrocyclotron can further include an injection electrode and an extraction electrode having voltages controlled by the programmable digital waveform generator. The synchrocyclotron can further include a beam monitor. The synchrocyclotron can detect resonant conditions in the resonant circuit by measuring the voltage and or current in the resonant circuit, driven by the input voltage, and adjust the capacitance of the variable capacitor or the frequency of the input voltage to maintain the resonant conditions.

Abstract: A synchrocyclotron includes magnetic structures to provide a magnetic field to a cavity, a particle source to provide a plasma column to the cavity, where the particle source has a housing to hold the plasma column, and where the housing is interrupted at an acceleration region to expose the plasma column, and a voltage source to provide a radio frequency (RF) voltage to the cavity to accelerate particles from the plasma column at the acceleration region.

Abstract: A synchrocyclotron includes magnetic structures that define a resonant cavity, a source to provide particles to the resonant cavity, a voltage source to provide radio frequency (RF) voltage to the resonant cavity, a phase detector to detect a difference in phase between the RF voltage and a resonant frequency of the resonant cavity that changes over time, and a control circuit, responsive to the difference in phase, to control the voltage source so that a frequency of the RF voltage substantially matches the resonant frequency of the resonant cavity.

Abstract: Apparatus and method for trapping uncharged multi-pole particles comprises a bound cavity for receiving the particles, and a multiplicity of electrodes coupled to the cavity for producing an electric field in the cavity. In a preferred embodiment, the electrodes are configured to produce in the electric field potential both a multi-pole (e.g., dipole) component that aligns the particles predominantly along an axis of the cavity and a higher order multi-pole (e.g., hexapole) component that forms a trapping region along the axis. In one embodiment, the electrodes and/or the particles are cooled to a cryogenic temperature.

Abstract: An apparatus for an improved cyclotron for producing radioisotopes especially for use in association with medical imaging. The improved cyclotron is configured without a conventional electromagnetic coil. A plurality of dees and a plurality of permanent magnets are alternately disposed in a circular array, each defining a channel through which ions travel. The vacuum chamber wall defines an opening disposed at the center of the array, the opening being configured to receive an ion source. Positive ions flowing from the ion source are exposed to the magnetic field generated by permanent magnets. The positive ions are repelled as they exit a positively charged dee. Negatively charged dees pull the ions. Each time the particles pass through the gap approaching the dees and as they leave the dee and pass through the magnets, they gain energy, so the orbital radius continuously increases and the particles follow an outwardly spiraling path.

Abstract: A particle therapy system is provided. The particle therapy system includes at least two acceleration units, with each of which acceleration units particles can be accelerated to at least an energy necessary for the irradiation; and a common energy selection system, connected downstream of the at least two acceleration units, with which system the energy of particles that have been accelerated by one of the acceleration units can be reduced.

Abstract: The invention concerns a cyclotron for accelerating a charged particle beam circulating in the median plane essentially in the form of two poles inducing a magnetic field and having a so-called axial injector, that is an injector arranged outside the cyclotron substantially along the main axis of the cyclotron and hence perpendicular to the median plane thereof and which is combined with deflecting means which enable the particle beam to be deflected until it is positioned in the median plane. The invention is characterized in that the deflecting means consist of a magnetic deflector.

Abstract: A system for treating target cells with both positive and negative ions comprises a bi-polar beam delivery system configured to create and deliver both positive ion beams and negative ion beams. The bi-polar beam delivery system comprises a bi-polar accelerator configured to accelerate positive and negative ions in the same direction making such a bi-polar beam delivery system practical.

Abstract: The invention relates to a cyclotron which can produce a beam of accelerated charged particles that are intended for the irradiation of at least one target (200). The inventive cyclotron consists of a magnetic circuit which essentially comprises: an electromagnet with at least two poles (1, 1?), namely an upper pole (1) and a lower pole (1?), which are disposed symmetrically in relation to a mid-plane (110) which is perpendicular to the central axis (100) of the cyclotron and which are separated by a gap (120) containing the circulating charged particles and return flux (2) in order to close the aforementioned magnetic circuit; and a pair of main induction coils (5, 5?) which are used to create an essentially-constant main induction field in the gap between poles 1 and 1?.

Abstract: An apparatus for an improved cyclotron for producing radioisotopes especially for use in association with medical imaging. The improved cyclotron is configured without a conventional electromagnetic coil. A plurality of dees and a plurality of permanent magnets are alternately disposed in a circular array, each defining a channel through which ions travel. The vacuum chamber wall defines an opening disposed at the center of the array, the opening being configured to receive an ion source. Positive ions flowing from the ion source are exposed to the magnetic field generated by permanent magnets. The positive ions are repelled as they exit a positively charged dee. Negatively charged dees pull the ions. Each time the particles pass through the gap approaching the dees and as they leave the dee and pass through the magnets, they gain energy, so the orbital radius continuously increases and the particles follow an outwardly spiraling path.

Abstract: A synchrocyclotron comprises a resonant circuit that includes electrodes having a gap therebetween across the magnetic field. An oscillating voltage input, having a variable amplitude and frequency determined by a programmable digital waveform generator generates an oscillating electric field across the gap. The synchrocyclotron can include a variable capacitor in circuit with the electrodes to vary the resonant frequency. The synchrocyclotron can further include an injection electrode and an extraction electrode having voltages controlled by the programmable digital waveform generator. The synchrocyclotron can further include a beam monitor. The synchrocyclotron can detect resonant conditions in the resonant circuit by measuring the voltage and or current in the resonant circuit, driven by the input voltage, and adjust the capacitance of the variable capacitor or the frequency of the input voltage to maintain the resonant conditions.

Abstract: System for ion acceleration for medical purposes comprising a conventional or superconducting cyclotron, a radiofrequency linear accelerator (Linac), a Medium Energy Beam Transport line (MEBT) connected, at the low energy side, to the exit of the cyclotron, and at the other side, to the entrance of the linear radiofrequency accelerator, as well as a High Energy Beam Transport line (HEBT) connected at high energy side to the radiofrequency linear accelerator exit and at the other end, to a system for the dose distribution to the patient. The high frequency of operation of the Linac allows for a reduced consumption and a remarkable compactness facilitating its installation in hospital structures. The use of a modular LINAC allows varying in active way the energy and the current of the therapeutic beam, having a small emittance and a time structure adapted to the dose distribution based on the technique known as the “spot scanning”.

Abstract: A synchrocyclotron comprises a resonant circuit that includes electrodes having a gap therebetween across the magnetic field. An oscillating voltage input, having a variable amplitude and frequency determined by a programmable digital waveform generator generates an oscillating electric field across the gap. The synchrocyclotron can include a variable capacitor in circuit with the electrodes to vary the resonant frequency. The synchrocyclotron can further include an injection electrode and an extraction electrode having voltages controlled by the programmable digital waveform generator. The synchrocyclotron can further include a beam monitor. The synchrocyclotron can detect resonant conditions in the resonant circuit by measuring the voltage and or current in the resonant circuit, driven by the input voltage, and adjust the capacitance of the variable capacitor or the frequency of the input voltage to maintain the resonant conditions.

Abstract: A system for treating a patient by proton therapy, also called gantry, includes a proton beam guide involving, in particular, magnets, quadropoles, and the like and having an outlet aperture for guiding and directing the proton beam to the side in the patient that is to be treated. In addition, a patient table that cab en displaced in a controllable manner is provided for moving the patient into a desired position relative to the proton beam. The inventive proton beam guide and control device is mounted down from the patient table in the direction of the beam guide in a supported manner whereby being able to rotate or pivot about a horizontal axis.

Abstract: Disclosed here is a cyclotron having a beam phase selector capable of controlling phase widths of beams and improving beam permeability for increasing beam current. The cyclotron contains an acceleration voltage applying section and a beam blocking section, at least any one of the two sections has a movable structure. While a particle is passing across a gap between dee electrodes, the acceleration voltage applying section applies RF acceleration voltage to the particle, and further applies RF acceleration voltage having a phase different from the phase of previously applied RF acceleration voltage. The beam blocking section blocks undesired particles. Preferably, the acceleration voltage applying section at least has an electrode having an opening in a direction of the core of the cyclotron. Also preferably, operations on phase-width control can be performed outside the cyclotron, with vacuum condition in the cyclotron maintained.

Abstract: According to the present invention, a non-isochronous magnetic field distribution in which the magnetic field increases as the radius increases is formed and a distribution of fixed-frequency accelerating RF voltage is formed, said non-isochronous magnetic field distribution and said distribution of fixed-frequency accelerating RF voltage being formed so that a harmonic number defined as a ratio of the particle revolution period to the period of the accelerating RF voltage decreases in integer for every particle revolution.

Abstract: An inductive output tube (IOT) operates in a frequency range above 1000 MHz. An output window may be provided to separate a vacuum portion of the IOT from an atmospheric pressure portion of the IOT, the output window being surrounded by a cooling air manifold, the manifold including an air input port and a plurality of apertures permitting cooling air to move from the port, through the manifold and into the atmospheric pressure portion of the IOT. The output cavity may include a liquid coolant input port; a lower circular coolant channel coupled to receive liquid coolant from the liquid coolant input port; a vertical coolant channel coupled to receive liquid coolant from the lower circular coolant channel; an upper circular coolant channel coupled to receive liquid coolant from the vertical coolant channel; and a liquid coolant exhaust port coupled to receive liquid coolant from the upper circular coolant channel.

Abstract: An electron tube for communication is provided with an output waveguide that is directly coupled to an outlet port of a RF (Radio Frequency) wave signal, and at least one of a low-pass filter, a high-pass filter, and a band-pass filter is included inside the output waveguide.

Abstract: The invention provides a charged particle therapy system capable of increasing the number of patients treated. An irradiation filed forming apparatus for irradiating a charged particle beam extracted from a charged particle beam generator to an irradiation target includes an RMW device. The RMW device comprises a housing and an RMW disposed within the housing. A rotary shaft of the RMW is rotatably mounted to the housing. The RMW device is detachably installed in an RMW holding member provided in a casing of the irradiation filed forming apparatus. The housing can be placed in contact with the RMW holding member, and hence positioning of the rotary shaft of the RMW to a predetermined position can be performed in a short time. This contributes to cutting a time required for treatment per patient and increasing the number of patients treated.