428results about "Magnetic resonance accelerators" patented technology

The invention provides an ultra-short beam homogenization transmission line system and method based on a four-eight-pole composite magnet. The system comprises the four-eight-pole composite magnet, a system, a linear beam homogenization structure, a bent beam homogenization structure and secondary iron used for a beam homogenization transmission line. The system further comprises an ultra-short linear beam homogenization transport line, an ultra-short bent beam homogenization transport line, an ultra-short linear bent composite beam homogenization transport line and an ultra-short symmetrical bent beam homogenization transport line based on the homogenization structure and / or the dipolar iron. The method comprises an exciting current debugging method based on the four-pole and eight-pole composite iron and a linear type and bending type beam debugging method. According to the invention, the problem that the maximum enveloping part on the transmission line is occupied and the effect of octopole iron cannot be fully exerted is solved; the problems that the beam envelope of the position where the octopole iron is located is small, and the requirement for the field intensity of the octopole magnet is high are solved. The problem that the civil engineering shielded around the transmission line is more expensive because the transmission line is too long is solved.

The invention discloses a single-coil winding type four-eight-pole composite iron system for beam homogenization. The composite iron system comprises a composite magnet current control device, a composite magnet main power supply and four-pole / eight-pole composite iron, the quadrupole / octupole composite iron has eight pole heads, and only one type of excitation coil is wound on each pole head; the current value of the A-type excitation coil is an absolute value of a quadrupole magnetic field excitation current value plus an octupole magnetic field excitation current value; the current value of the B-type excitation coil is an absolute value obtained by subtracting an octupole magnetic field excitation current value from a quadrupole magnetic field excitation current value; the quadrupole / octupole composite iron is used for simultaneously generating a dominant quadrupole magnetic field and an octupole magnetic field, so that the effects of quadrupole iron and octupole iron can be simultaneously realized by only installing one transmission element; the excitation coil structure of the quadrupole / octupole composite iron composite magnet is improved, and only one excitation coil is wound on each pole head, so that the size of the coil structure can be reduced, and the construction cost is reduced.

The invention discloses a conduction cooling type superconducting isochronous cyclotron, and belongs to the technical field of superconducting isochronous cyclotrons. Comprising an accelerator main support, the accelerator main support is integrally of a base frame structure composed of a plurality of vertical supports, vertically-arranged hydraulic lifting systems are further fixedly installed on the side walls of each set of vertical supports, and a first magnet yoke is fixedly installed at the top of the accelerator main support; a refrigerating machine direct conduction cooling technology is adopted, a traditional liquid helium soaking cooling system is replaced, and the problem that a superconducting cyclotron depends on a complex liquid helium refrigeration unit and is redundant in structure is solved. While the magnetic field intensity is maintained, heavy parts such as a liquid helium pool, a recondenser and a multi-layer heat insulation pipeline are completely abandoned, so that the system height and the sealing complexity are remarkably reduced, and high operation and maintenance cost caused by dependence of liquid helium resources is also avoided.

The invention discloses an ion source automatic beam adjusting method, a radiotherapy system and related equipment, and relates to the technical field of radiotherapy, and the method comprises the steps: monitoring and adjusting a plurality of control parameters in real time, and obtaining an optimal control parameter combination; under the optimal control parameter combination, the variable quantity of each control parameter before and after adjustment and the performance change of the proton beam are obtained; performing a pulse width charge test according to the variation of each parameter before and after adjustment and the performance change of the proton beam; obtaining an optimal adjustment parameter and an adjustment amount through a pulse width charge test result; and through the optimal adjustment parameter and adjustment amount, automatic beam adjustment is realized, stable and efficient acceleration of the proton beam in the synchrocyclotron system is realized, and the stability and consistency of the proton beam are ensured.

The invention relates to the technical field of superconducting cyclotrons, and discloses a spiral resonant cavity for a superconducting cyclotron, which comprises an upper resonant cavity body and a lower resonant cavity body, and the upper resonant cavity body is positioned right above the lower resonant cavity body; through distributed waterway design and structural optimization, the cooling system can effectively process heat generated in the accelerator; efficient heat dissipation of the system is ensured through design means such as a multi-directional cooling channel, an oxygen-free copper brazing pipeline and a double-path independent cooling pipe, excessive accumulation in a high-temperature area is avoided, and meanwhile the stability of equipment can be kept in long-time operation; the structure of the single inner rod is convenient for voltage distribution adjustment, the structure is simple and compact, and the processing complexity and the manufacturing cost are greatly reduced; a core component solution with high reliability and low operation and maintenance cost is provided for the superconducting cyclotron, and application efficiency upgrading in the fields of medical treatment, scientific research and the like is promoted.

The invention discloses an ultrashort bending type beam homogenization transmission line. The ultrashort bending type beam homogenization transmission line is characterized in that the transmission line is an ultrashort bending type high-current homogenization transmission line comprising two pieces of four-eight-level composite iron and one piece of second-level iron; the ultra-short bending type high-current homogenized transmission line is an ultra-short bending type high-current homogenized transmission line A which is arranged along a beam current direction; or the ultra-short bending type high-current homogenization transmission line B is arranged along the beam direction; the ultra-short bending type high-current homogenization transmission line A is sequentially provided with an accelerator leading-out port, a beam matching mechanism, fourth and eight-stage composite iron 1, second-stage iron, fourth and eight-stage composite iron 2, a beam matching and homogenization effect observation mechanism 1 and a terminal 1 along the beam leading-out direction; the tetra-octupole composite iron of the beam line can simultaneously realize focusing and homogenization effects on beam envelope, the composite iron is installed on a beam transmission line, the number of transmission elements can be reduced, the length of the transmission line is shortened, and the construction cost of the beam transmission line is reduced.

The invention relates to the technical field of axial focusing enhancement of a cyclotron, and provides an axial focusing enhancement method and system for a medical cyclotron, and the method comprises the steps: collecting vibration data, a beam intensity value, temperature data, the positions of all particles in a particle beam, the average magnetic field intensity, the magnetic field intensity difference, and the current; the divergence angle and energy of the particle beam are measured; determining an axial focusing effect evaluation value at the current sampling moment; determining the particle beam stability at the current sampling moment, and determining the magnetic field uniformity at the current sampling moment by combining the average magnetic field intensity and the magnetic field intensity difference at the current sampling moment; and the axial focusing effect evaluation value, the average magnetic field intensity and the current at the current sampling moment are combined to realize the axial focusing enhancement of the medical cyclotron. According to the invention, the focusing precision of axial focusing enhancement of the medical cyclotron and the stability of the focusing effect can be improved.

The invention discloses a quadrupole / octupole composite iron system for beam homogenization. The composite iron system comprises a composite magnet current control device, a composite magnet main power supply and quadrupole / octupole composite iron, the composite magnet current control device is used for controlling a composite magnet main power supply to output quadrupole field coil current and octupole field coil current of quadrupole / octupole composite iron. The quadrupole / octupole composite iron is used for simultaneously generating a dominant quadrupole magnetic field and an octupole magnetic field, so that the effects of quadrupole iron and octupole iron can be simultaneously realized by only installing one transmission element; according to the invention, a quadrupole magnetic field and an octupole magnetic field are generated in the aperture of the composite iron, focusing and homogenization of beam envelope are realized at the same time, the number of transmission elements can be reduced, the length of a transmission line can be shortened, and the construction cost of the beam transport line is reduced. The problem that traditional quadrupole iron and octupole iron cannot be simultaneously installed at the maximum beam envelope position due to the space problem and cannot play a great role of a magnet is solved.

The present invention relates to a synchrotron fast-response magnetic alloy high-frequency system, comprising: a control circuit for generating a waveform signal; a full-solid-state power source for receiving the waveform signal and performing power synthesis to generate a power signal; an impedance phase compensator for realizing impedance rise and fall and phase compensation; an impedance transformer for realizing impedance transformation to achieve impedance matching between the full-solid-state power source and the magnetic alloy-loaded resonant cavity; a magnetic alloy-loaded resonant cavity for receiving the power signal and generating a radio frequency signal to operate on the heavy ion beam; and a sampling circuit for sampling the radio frequency signal and feeding it back to the control circuit. The synchrotron fast-response magnetic alloy high-frequency system provided by the technical solution of the present invention has performance indicators of low frequency, high bandwidth, fast rising of voltage signal and response, and can output single-sine and half-sine waveforms, realizing the functions of capturing, accelerating and Barrier Bucket bunch accumulation for various heavy ion beams.

The invention discloses a novel electronic gun for a cyclotron wave protector, and relates to the technical field of vacuum electronic devices. The electron gun comprises a cathode assembly, an anode assembly, a supporting assembly and a permanent magnet system. Wherein the cathode assembly adopts a planar cold cathode structure; the anode assembly comprises an anode main body and an electron beam channel in the anode main body; the cathode and the anode are fixedly connected through a supporting assembly; the permanent magnet system provides a uniform magnetic field. The cold cathode is adopted to replace a traditional hot cathode to generate high-quality strip-shaped electron beams, and the device has the advantages of being simple in structure, easy to integrate, rapid to start, long-acting, reliable, low in consumption and energy-saving.

The invention relates to a low-energy type cyclotron and a solid target device used for the low-energy type cyclotron, and the solid target device comprises a target material installation part which is used for installing a target material and comprises a first end and a second end which are oppositely arranged in the first direction; the first cooling piece is arranged at the first end of the target material mounting piece, a first cooling cavity is formed in the first cooling piece, and a gas cooling medium circulates in the first cooling cavity; and the second cooling piece is arranged at the second end of the target material mounting piece, a second cooling cavity is formed in the first cooling piece, and the second cooling cavity is used for circulating a liquid cooling medium. The cyclotron is simple in structure and low in refitting cost, can be additionally arranged on the basis of an original accelerator system, does not need to be reformed, and greatly reduces the use cost; by arranging the first cooling piece and the second cooling piece which are separated, air cooling and water cooling are physically isolated, no mixed loop exists, starting is conducted as needed through an independent control system, the cooling efficiency is greatly improved, and the cooling device is more suitable for the low-energy cyclotron.

A particle acceleration and extraction system includes a cyclotron having a stripping assembly and a target. The cyclotron includes an acceleration chamber and is operable to generate a magnetic field and an electric field in the acceleration chamber such that charged particles in the acceleration chamber are accelerated along a spiral path extending outward and at increasing energies from an initial energy E1 to a final energy E2, E2 being greater than E1. The target defines a target location outside of the acceleration chamber. The stripping assembly is positioned in the acceleration chamber and is operable to extract a charge from the charged particles at an intermediate location of the outward spiral path whereby the post-stripping assembly particles are directed towards the target location. The charged particles have an intermediate energy E3 at the intermediate location that is between E1 and E2.

The utility model discloses a kind of variable beam binding devices for cyclotron, install in beam pipeline, realize the size and shape of remote online hard constraint beam envelope by the variable adjustment of inner hole, involve variable beam binding technical field, including vacuum connection flange, fixed support, transmission gear, rotary disc, gear disc, blade combination, the blade combination, vacuum connection flange are connected with vacuum pipeline;Fixed support, the fixed support is set to vacuum connection flange side edge, and the fixed support is used to fix beam binding blade, motor, transmission gear, rotary disc;Gear disc is connected with the fixed support, and one side of the beam binding blade combination is connected;Rotary disc.The utility model can adjust multiple beam binding aperture, without disassembling when adjusting, save vacuum extraction and replacement time.Structure is simple, and cost is low, and implementability is high.Dismounting is reduced simultaneously, and the time of maximum degree operation personnel contact dose can be operated.

To provide a magnetic field measurement device of an accelerator and a particle beam therapy system capable of measuring a magnetic field in a magnetic channel having a curved part.SOLUTION: A magnetic field measurement device 2000 for measuring a magnetic field in a predetermined region 1019 of an accelerator 1004 includes a magnetic sensor and at least one sensor head 2400 for supporting the magnetic sensor on the tip side. The sensor head has a curved shape corresponding to the predetermined region.SELECTED DRAWING: Figure 1

An accelerator capable of efficiently and satisfactorily extracting a beam is provided. A main magnet A101 applies a main magnetic field to a space between a plurality of main magnetic poles M202 arranged to face each other. An RF kicker M204 causes a beam circulating in a main magnetic field region to which the main magnetic field is applied to be displaced to outside of the main magnetic field region. An extraction channel magnetic field to extract the beam is generated. A canceling magnetic field generation device M214 is provided to be closer to an inner peripheral side than an extraction channel M207 and generates a canceling magnetic field with a polarity opposite to that of a disturbance magnetic field produced by an extraction channel.

The invention relates to the technical field of cyclotrons, in particular to a medical cyclotron beam current intensity control method, which comprises the following steps: acquiring various beam current control parameter data of a medical cyclotron at each acquisition moment in real time; determining a stable deviation value of state response between any two kinds of beam control parameter data, and further determining a confidence difference value of various kinds of beam control parameter data; obtaining each time interval; determining response difference values of the various beam control parameter data in each time interval based on the confidence difference values and differences of discrete degrees between the various beam control parameter data in each time interval and all other beam control parameter data; and determining a deviation response value of the beam current intensity data at the current moment, and adjusting a feedback signal value at the current moment so as to control the beam current intensity in the medical cyclotron. The invention aims to improve the control precision of the beam current intensity of the medical cyclotron.

The invention discloses an ultrashort linear beam homogenization structure, which is characterized in that two four-eight-pole composite magnets are used on a transmission line, the beam envelope function in the Y direction or the X direction reaches the maximum value at the first four-eight-pole composite magnet, and the beam envelope function in the Y direction or the X direction reaches the maximum value at the second four-eight-pole composite magnet. The X-direction beam envelope function or the X-direction beam envelope function reaches the maximum value; the phase movement of the particles between the two four-eight-pole composite magnets and the target is close to an integral multiple of 180 degrees; a transmission matrix between the two octopole magnetic fields is close to a unit matrix. According to the invention, two pieces of four-eight-pole composite iron are used, the phase shift # imgabs0 # of particles between the two pieces of four-eight-pole composite iron and the target is limited to be close to an integral multiple of 180 degrees, a transmission matrix between two eight-pole magnetic fields is limited to be close to a unit matrix, and an ultra-short beam homogenized transport line is realized. The problems of dozens of meters in length, large occupied area and high cost of a beam homogenization transport line in a conventional method are solved.

The invention discloses a positive particle phase-based method for improving longitudinal focusing force of a central area of an accelerator. The method comprises the following steps of: dividing a radio frequency cavity into a radio frequency cavity for generating energy difference and a radio frequency cavity for eliminating the energy difference; the energy gain of beam head particles is set to be high, and the energy of beam tail particles is set to be low; the rotation angle of the head structure of the radio frequency cavity generating the energy difference is adjusted anticlockwise, so that the energy of particles at different longitudinal positions of a beam cluster has a certain energy difference; the rotation angle of the head structure of the radio frequency cavity with the energy difference eliminated is adjusted clockwise, the energy difference is eliminated at the position with the minimum beam bunch width, and particles are compressed from non-receiving and non-acceleration areas on the two sides of the current radio frequency period to the middle received and accelerated area with the minimum phase width. Longitudinal focusing is achieved in a positive phase mode, and the focusing effect in the height direction is better while longitudinal focusing is achieved in the positive phase mode.

The invention provides a core column and magnetic pole structure of an endogenous cyclotron, the core column is symmetrically arranged in central areas at two sides of a central plane of the accelerator, the core column is a big-end-down circular truncated cone-shaped core column, a pair of core column concave platforms is arranged on the circular truncated cone, and the core column concave platforms are used for arranging ion sources; according to the magnetic pole structure, a main magnetic pole and a core column are integrally manufactured, and the core column in the middle of the integrated magnetic pole structure is of a big-end-down circular-truncated-cone-shaped structure; chamfers are arranged at the junctions of the two side faces and the upper surface of each magnetic pole of the integrated magnetic pole structure, and four slopes inclining towards the central point of the central area are designed in the head area of the fan-shaped magnetic pole, so that transition from a circular truncated cone in the central area to a peripheral magnetic field is smoother; on the basis that the radial size of the upper surface of the core column is not increased, the head magnetic field is still improved by increasing the volume, close to the lower surface, of the core column; the two symmetrical concave platforms are designed on the circular truncated cone type core column, so that the symmetry of a magnetic field is reserved, and meanwhile, a sufficient installation space is reserved for an ion source.

The application discloses a high-frequency shielding bellows and a synchrotron radiation accelerator with the same, which comprises a bellows outer tube extending along a first direction; a shielding tube arranged on the radially inner side of the bellows outer tube and comprising two beam flow pipes extending along the first direction and arranged at intervals in the first direction, and the opposite ends of the two beam flow pipes are fixed with the bellows outer tube respectively; and a sliding unit comprising a sliding piece extending along the first direction, the sliding piece being a conductive piece, and the two ends of the sliding piece are configured to be always slidably attached to the beam flow pipe on the same side along the first direction. According to the high-frequency shielding bellows, when the electron beam flows, a continuous mirror wall current path can be formed, good electrical contact is maintained, high-order mode leakage and electron beam instability are effectively inhibited, and the heating phenomenon caused by the excessive wall resistance of the bellows outer tube can be avoided, so that the reliability of the high-frequency shielding bellows is significantly improved.

The present invention relates to a cyclotron comprising first and second internal ion sources configured to form first and second beams of identical charged particles wherein the cyclotron is further configured to generate a local asymmetry of an accelerating electric and / or magnetic field, the first beam and the second beam are combined to form a combined beam and the combined beam passes through a single extraction outlet. The invention also relates to an acceleration system comprising N cyclotrons, where M cyclotrons are the cyclotrons according to the invention, Mgt; 0. The invention also relates to a device for treating a patient by BNCT, comprising: an acceleration system according to the invention; a target configured to emit an epithermal neutron beam when bombarded with the proton or deuteron multi-combination beam; and a treatment region configured to hold a patient to be treated within the treatment region.

To provide a cyclotron and a method for operating the cyclotron.SOLUTION: A cyclotron comprises: rotatable pieces 12 for generating a magnetic field in a particle acceleration chamber 14; and an upper part 101 and lower part 102 of the particle acceleration chamber 14 configured to be separable from each other. Therein: the rotatable pieces 12 each are at least partially made of a permanent magnet material, each are oriented along respective axis 18 such that an extremity of the rotatable pieces 12 is closer to a central axis 11 of the cyclotron than another extremity, and each are rotatable about the respective axis 18; the magnetic field generated by the rotatable pieces 12 varies depending on positions of the rotatable pieces 12 about the respective axes 18; and the rotatable pieces each have a cross-section situated closer to the central axis 11 of the cyclotron which is smaller than other cross-sections which are situated farther from the central axis 11 of the cyclotron; and the cross-sections of the rotatable pieces 12 are transverse to the respective axes 18.SELECTED DRAWING: Figure 2

To provide a particle beam treatment system and a method for renewing facilities of the particle beam treatment system with which the facilities can be renewed efficiently. A particle beam treatment system 1 includes a charged particle beam generation device 2 that generates a charged particle beam Bm, a first irradiation device 4(1) that irradiates the charged particle beam to a predetermined irradiation target, a first beam transportation device 3(1) that transports the charged particle beam from the charged particle beam generation device 2 to the first irradiation device 4(1), and a first vacuum valve 33(1) that is arranged in the first beam transportation device 3(1).

To provide an accelerator system and a discharge detector that can suppress the impact of discharge on the inside of an accelerator.SOLUTION: An accelerator system 100 includes a discharge detector 60 that detects discharge inside an accelerator 1. On the basis of the detection of continuous discharge, the discharge detector 60 cuts off the discharge at a stage before the discharge has an effect inside the accelerator 1. Therefore, even when continuous discharge occurs inside the accelerator 1, the discharge can be cut off early to prevent the discharge from having an effect. As described above, the effect of the discharge on the inside of the accelerator 1 can be suppressed.SELECTED DRAWING: Figure 1

The present invention relates to a high-voltage power supply device for an electrostatic deflection plate, comprising a high-voltage generator and a high-voltage connection device. The high-voltage generator is used to convert and transmit incoming alternating current (AC) electricity through high-frequency inversion and soft-switching technology. The high-voltage connection device is connected to the generator at one end and to the electrostatic deflection plate at the other end, transmitting the stepped high-voltage electrical energy output by the generator to the plate while ensuring the voltage resistance of the connection. The present invention can be widely applied in the field of nuclear technology.

There is provide a circular accelerator and a particle beam therapy system that can improve the beam extraction efficiency. A circular accelerator that accelerates and extracts charged particle beams circulating in a magnetic field includes a first magnetic field region in which closed trajectories of the beams with different energies are eccentric and which has a magnetic field gradient decreasing in the magnetic field toward an outer peripheral side and a second magnetic field region having a magnetic field gradient increasing in the magnetic field toward the outer peripheral side. A border between the first magnetic field region and the second magnetic field region is located on a downstream side in a traveling direction of the beam with respect to a predetermined region in which an interval between the closed trajectories of the beams with the different energies is narrowest.

To provide an acceleration cavity capable of switching energy of charged particles without using a complex mechanism.SOLUTION: An acceleration cavity comprises: a body that is in an electrically conductive cylindrical shape and includes a plurality of division members obtained by division using a plane along the central axis so that division surfaces along the plane are provided in a state of facing each other with a gap; a plurality of cell parts that are disposed inside the body in a state of being arranged in the axial direction of the central axis of the body and are communicated with each other using a communication part through which charged particles can pass; and a switch member that is disposed in the gap of the body, is movable in the gap along the plane, and performs movement to switch the magnitude of an electric field for accelerating the charged particles.SELECTED DRAWING: Figure 2

The application provides an ultra-short beam current homogenization transmission line system and method based on a four-octupole composite magnet, which comprises the four-octupole composite magnet and a system, a linear type and a bending type beam homogenization structure, and a two-stage iron for the beam homogenization transmission line; further comprises an ultra-short linear type beam homogenization transmission line, an ultra-short bending type beam homogenization transmission line, an ultra-short linear-bending composite type beam homogenization transmission line and an ultra-short symmetric bending type beam homogenization transmission line based on the homogenization structure and / or the two-stage iron; the method comprises a four-octupole composite iron-based excitation current debugging method and a linear type and a bending type beam debugging method; the application solves the problems that the place with the largest envelope on the transmission line is occupied and the eight-pole iron cannot fully play a role, solves the problem that the beam envelope at the position of the eight-pole iron is small and the field intensity requirement of the eight-stage magnet is high, and solves the problem that the length of the transmission line is too long, which leads to the increasing cost of the surrounding shielding civil engineering.

The present disclosure relates to a cyclotron, a radiation therapy apparatus, an adjustment unit, an adjustment device of a superconducting coil, and an adjustment method thereof. The adjustment unit includes a rotating shaft, a drive assembly, a transmission assembly, and a detection element. The rotating shaft is capable of rotating driven by an external drive unit; the drive assembly includes an actuator and a tension assembly, the actuator being configured to drive the tension assembly to move linearly through rotation, and one end of the tension assembly being connected to a superconducting coil and capable of driving the superconducting coil to move; the transmission assembly is connected to the rotating shaft and the actuator, respectively, and configured to transmit power to the actuator; and the detection element is connected to the actuator and configured to monitor a displacement of the tension assembly and a displacement of the superconducting coil.