257results about "Magnetic resonance accelerators" patented technology

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 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.

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.

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 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 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

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.

The invention discloses a microwave measurement and control device, and relates to the technical field of particle acceleration. The antenna comprises a backboard, a radio frequency unit and a tuning unit. The backboard is provided with a high-speed serial transmission channel; the radio frequency unit is connected with the backboard to collect radio frequency field state data of the accelerator cavity; the tuning unit is connected with the backboard to output a driving signal to adjust the resonant frequency of the cavity. Wherein the radio frequency unit and the tuning unit establish a direct connection link through a high-speed serial transmission channel, and the tuning unit cooperatively adjusts the resonant frequency of the cavity according to radio frequency field state data. A traditional CPCI architecture is optimized through the backboard, the high-speed serial transmission channel comprises the first communication channel, radio frequency field state data does not need to be transferred and is directly transmitted to the tuning unit through the high-broadband and high-performance first communication channel, the problems of large transmission delay and cooperative lagging caused by bandwidth sharing of an existing CPCI architecture are effectively solved, and the communication performance of the CPCI architecture is improved. Tuning can be rapidly carried out through closed-loop control, and the stability of the accelerator beam is remarkably improved.

The application discloses a built-in radio frequency antenna for a radio frequency negative hydrogen ion source and a manufacturing process, the radio frequency antenna has 2.5-3.5 turns, and the average loop diameter is 58mm; the coating of the built-in radio frequency antenna is an enamel structure, when the enamel structure simultaneously satisfies the conditions that the coating thickness is 0.6-0.7mm, the relative dielectric constant is less than 30, and the coating resistivity is greater than 45000Ω.cm, the warping voltage is close to 0; the process method comprises the following steps: manufacturing a sheet-shaped porcelain enamel; covering layer dipping; drying the copper antenna with the covering layer; firing the finished product; putting the dried copper antenna with the glaze into a melting furnace for firing and heat preservation; taking out the finished product and cooling to normal temperature. The steps (2) to (4) are repeated until the thickness of the glaze layer reaches about 0.6-0.7mm. The application effectively solves the problem of plasma back-bombing antenna, and the enamel coating is adopted, so that the cost is low, the manufacturing is simple, the material is solid, and the adhesion, impact resistance and thermal shock resistance are excellent.

A single-circle injection system for a heavy ion synchrotron cancer treatment device comprises a cutting magnet, a focusing quadrupole magnet, a deflection electrode and an impact magnet, the cutting magnet, the deflection electrode and the impact magnet are all arranged on the two sides of the focusing quadrupole magnet on a synchrotron main ring track, the cutting magnet is located on one side, and the deflection electrode is located on the other side. The deflection electrode and the impact magnet are located on the other side, are directly installed on a main ring track of the synchrotron and are arranged at the positions where an injection beam is about to intersect with a closed track of the synchrotron. And the deflection electrode and the impact magnet are used for compensating the residual angle deviation, so that the beam current is completely matched with the main ring track. The invention has the advantages of high-efficiency beam transmission, simplified structure, reduced cost and flexible energy switching.

The invention discloses a particle beam leading-out device, a stripping film adjusting method and a cyclotron, and relates to the field of cyclotrons, the particle beam leading-out device comprises a driving motor, a magnetic fluid sealing device, a flange and a right-angle transmission mechanism which are connected in sequence; the driving motor is fixed at the front end of the flange through a motor mounting bracket; the input end of the magnetic fluid sealing device is connected with an output shaft of the driving motor, and the output end of the magnetic fluid sealing device penetrates through the flange and the support to be connected to the right-angle transmission mechanism. The right-angle transmission mechanism is connected to the driving motor and the two film stripping structures, so that the two film stripping structures can be subjected to angle adjustment or position switching, and the right-angle transmission mechanism is composed of the base, the first main shaft and the second main shaft and realizes movement direction switching through a structural mode of a hinge and a connecting rod; vibration and noise generated by gear meshing can be effectively avoided, abrasion loss is greatly reduced through the structure, and therefore the maintenance frequency of equipment is greatly reduced.

To provide a superconducting magnet with an iron core that can efficiently protect a refrigerator port part.SOLUTION: A superconducting magnet 11 with an iron core comprises: iron cores 12, 13; a coil part vacuum container 20 provided inside the iron cores, the coil part vacuum container having a main coil 23 built therein; and refrigerator port parts 30 provided in the iron cores, and each including a body part 31 provided exposed to the surface of the iron core and a cold head part 32 extending from the body part to the main coil through the iron core and connected with the main coil. A magnetic shield part 202 is provided between the body part and the cold head part through which the cold head part penetrates.SELECTED DRAWING: Figure 4

The application discloses a method for precisely controlling a proton treatment process, comprising the following steps: selecting a feeding voltage fluctuation amplitude greater than or equal to U0 as a late fault prediction standard; collecting data of a leakage current, a cavity vacuum degree and a feeding voltage value, and establishing a time sequence sample database; constructing and training an LSTM-based time sequence prediction model; collecting electrostatic deflection plate leakage current and vacuum degree data at a current t time point in real time; using the data collected at the current t time point as input of the prediction model, and predicting a feeding voltage fluctuation amplitude at a t+1 time point through the prediction model; after predicting that a fault is about to occur, issuing an instruction through a PLC to control a central area vertical deflection plate to shut off a beam current; and after predicting that the fault is eliminated, issuing a reset signal; through the combination of the two predictions, the application excludes factors causing instability of the beam current in the treatment process, and immediately resumes the treatment after the factors causing instability of the beam current are excluded, so that the proton treatment process is precisely controlled.

The invention discloses a first and third harmonic shared cavity type impedance matching mechanism for a high-frequency buncher, which is characterized in that the first and third harmonic shared cavity type impedance matching mechanism is connected with a bunching electrode to jointly form the first and third harmonic shared buncher; the shared buncher is arranged between an external ion source of the cyclotron and the cyclotron; the cavity type impedance matching mechanism shared by the first harmonic and the third harmonic comprises a cavity type matching circuit shared by the first harmonic and the third harmonic and a coupler shared by the first harmonic and the third harmonic. According to the invention, the groove which is folded for multiple times is innovatively processed in the lower cavity of the cavity, so that the integrated structure of the lower cavity and the outer conductor is ingeniously realized, and the risk of folding cracking is fundamentally eliminated. Through the first harmonic and third harmonic shared cavity design, the function of originally needing two independent bunchers is integrated into one shared cavity, the system cost is effectively reduced, meanwhile, the occupied space is remarkably reduced, and the requirement of a compact accelerator is perfectly met.

The invention relates to the technical field of particle accelerators, in particular to a compact rotary thin-wall beam transmission vacuum system and a design method. The beam transmission vacuum system comprises: a first transmission unit, one end of which is provided with a first bifurcated thin-wall dipolar iron vacuum chamber to form a first branch and a second branch; one end of the second transmission unit is connected with the second branch, and a second bifurcated thin-wall dipolar iron vacuum chamber and a third bifurcated thin-wall dipolar iron vacuum chamber are sequentially arranged in the second transmission unit to form a third branch, a fourth branch and a fifth branch; the fixed treatment terminal is connected with the first branch; and rotating the treatment terminal to provide the beam to one of the plurality of treatment rooms in an alternative manner. According to the invention, an intensive architecture that a single rotary treatment terminal provides particle beams for a plurality of treatment rooms at the same time is adopted, so that the equipment manufacturing cost is greatly reduced, the equipment utilization rate is improved, and the treatment cost is reduced.

The particle beam therapy device is a charged particle beam therapy device that irradiates a patient with a helium ion beam to perform treatment, wherein where another beam, for example, a deuterium beam, that differs in a nuclide from the helium ion beam is generated from a cation beam, a mixed beam in which the helium ion beam and the other beam are mixed is passed through a deflecting magnetic field of a deflecting electromagnet, and then the helium ion beam of the mixed beam is selectively passed by a passage selection unit.

The invention relates to a cyclotron which enables the production of α- or β-emitting radionuclides. The cyclotron, with a magnetic periodicity of 3, comprises three accelerating cavities connected to the centre, thus not requiring phase control between the cavities, forming a single high-frequency resonator. The six accelerating gaps per turn enable rapid acceleration (the angle ϕ between the accelerating gaps of each cavity being approximately 30°) which is essential for acceleration at the third and sixth harmonics. This cyclotron preferably has an injection system (31) supplied by different types of ion sources, making it possible to efficiently accelerate charged particles having Z / A ratios equal to 1 / 2 and to 1 / 4. The cyclotron may also have stripping extraction means positioned in the cyclotron so as to extract the charged particles and double their state of charge. These particles enable a set of nuclear reactions for producing α-emitting radionuclides.

This disclosure provides an automatic cavity radio frequency voltage recovery system and method. The automatic cavity radio frequency voltage recovery system includes a low-level device, a power source, a high-frequency cavity, and a programmable control module. The low-level device is used to control the amplitude stabilization, phase stabilization, and frequency tuning of the radio frequency signal, monitor the pulsed and continuous radio frequency voltages of the high-frequency cavity, monitor the normal signal of the interlocking condition, and switch the output mode of the radio frequency signal. The power source is used to amplify the radio frequency signal input from the low-level device and feed it into the high-frequency cavity, and provide a normal power source signal. The high-frequency cavity is used to resonate the radio frequency power fed by the power source, establish a radio frequency electric field, and adjust the frequency of the high-frequency cavity through a fine-tuning loop. The programmable control module is used to restore the radio frequency voltage of the high-frequency cavity based on the control of the fine-tuning loop by the low-level device after the radio frequency voltage of the high-frequency cavity drops to zero. This automatic cavity radio frequency voltage recovery system and method can quickly achieve automatic recovery of the cavity radio frequency voltage.

The application provides a synchronous accelerator multi-harmonic beam trajectory reconstruction method and system, and relates to the technical field of accelerators. The method comprises the following steps: obtaining an accelerating cavity high-frequency signal of the synchronous accelerator, so as to generate a frequency-synchronized reference waveform according to the accelerating cavity high-frequency signal; setting a phase trigger window based on the reference waveform, so as to control the synchronous acquisition of beam signals of a full ring of the synchronous accelerator by a beam diagnosis device of the full ring; performing time domain analysis on the beam signals to obtain an effective beam signal interval, so as to calculate position data of the beam signals based on the effective beam signal interval; and reconstructing the motion trajectory of the beam according to the position data of the beam signals, which can accurately identify and associate the data of the same beam in the multi-harmonic acceleration process.

The invention provides a calculation compensation method for an isochronous magnetic field of a cyclotron, and relates to the technical field of data processing, and the method comprises the steps: carrying out the particle tracking through a numerical integration method, and adjusting the initial parameters of particles through iterative search, when the deviation between the position and the momentum of the particle after the particle moves for one circle and the initial value is within a preset error range, obtaining a closed orbit of the charged particle; on the basis of a closed orbit, radial and axial tiny disturbance is applied to the initial state of the particles, multi-circle movement of the particles is tracked, oscillation data is recorded, fast Fourier transform analysis is conducted on the oscillation data, and radial oscillation frequency and axial oscillation frequency of the particles are extracted; and calculating the cyclotron frequency of the particles according to the closed orbit, and generating parameters for evaluating and compensating the isochronous magnetic field of the cyclotron in combination with the radial oscillation frequency and the axial oscillation frequency. The operation stability and the particle acceleration efficiency of the accelerator can be effectively improved.

The application relates to the technical field of plasma, in particular to a medical cyclotron beam centering adjustment method and system. The method comprises the following steps: acquiring a magnetic field sequence, a beam sequence and a current sequence; obtaining a beam fluctuation factor according to the difference in lag number corresponding to the maximum autocorrelation coefficient of the magnetic field sequence and the beam sequence, the correlation of the magnetic field sequence and the beam sequence, and the difference in the maximum autocorrelation coefficient; forming a beam fluctuation sequence by using the beam fluctuation factor; dividing the beam fluctuation sequence, and also dividing the current sequence; fitting a straight line based on the current fluctuation sequence and the current sequence; obtaining the current influence intensity at the current moment according to the difference between the excitation current in all sub-sequences and the overall excitation current of the current sequence and the mean square error; improving the proportional term according to the current influence intensity, controlling the excitation current based on the proportional term, and adjusting the proportional term in real time to optimize the magnetic field control effect. The application realizes higher and more stable nuclide production efficiency.

As the ion beam is accelerated, the radius of the spiral orbit gradually increases, and the center of the spiral orbit moves in the predetermined radial direction of the gap toward the direction close to the peripheral portion, and then the moving direction of the spiral orbit is reversed and further moves toward the center of the gap. To achieve this, the intensity distribution in the orbit plane of the main magnetic field is designed. Thus, as a small accelerator capable of changing the energy of the extracted beam, the efficiency of beam injection from the external ion source into the accelerator is improved, and as a result, the dose rate of the extracted ion beam is improved.

An accelerating cavity includes: a housing that is conductive, has a tubular shape, and is formed by joining a plurality of part members parted by a planar parting surface along a central axis; a plurality of cells that are arranged in the housing along an axial direction of the central axis of the housing, and are connected to each other by a communicating portion that allows charged particles to pass through; and a protrusion that is disposed at a position surrounding the communicating portion of each of the cells in the housing, protrudes toward an inner side of the cell in the axial direction, and has a shape becoming larger in a radial direction with respect to the central axis from a tip end portion toward a base end portion in the axial direction.