123 results about "Electron linear accelerator" patented technology

The invention provides a standing wave electron linear accelerator comprising accelerating chamber, coupling resonator, electron gun, microwave coupler, nose cone, titanium getter pump, thermostatic water jacket and tungsten target, wherein the nose cone is canceled from the accelerating chamber to be arranged in the couple resonator, two nose cones are arranged for each couple resonator on the front and rear end surfaces of the couple resonator. The accelerator by the present invention lowers the radial electric field intensity in the accelerating chamber, and maximize the output dosage. íí

The invention relates to a medical apparatus for tumor radiation therapy, in particular to a same-source double-energy medical electron linear accelerator for image guided radiation therapy (IGRT). The same-source double-energy medical electron linear accelerator for the IGRT is characterized in that: an accelerating tube is vertically arranged and is connected with a moving target below the accelerating tube; an energy switch is arranged on the accelerating tube; an X-ray heavy metal target and a low atomic number target are arranged on the moving target; and the X-ray heavy metal target and the low atomic number target are connected with a driving mechanism of the moving target. The same-source double-energy medical electron linear accelerator for the IGRT has the advantages that: energy of an electron beam generated by the accelerating tube is reduced by the energy switch; by using the characteristic that the electron beam impacts the low atomic number target to generate more low-energy beams, X rays with clear portal imaging are obtained; and the same-source double-energy medical electron linear accelerator for the IGRT has the characteristics of easy mode conversion, same source, stable beam, clear image, economy, reliability, simpleness and convenience in clinical use and the like.

The invention discloses a grid-controlled electron gun digital power supply for a medical electron linear accelerator. The grid-controlled electron gun digital power supply comprises an alternating current input module, a power conversion module, a high voltage output module and a comprehensive signal processing system, wherein the alternating current input module is used for filtering and rectifying input alternating current power, performing slow start control on the input alternating current power and providing low voltage auxiliary power for the entire power supply; direct current voltage generated by the alternating current input module is converted into high frequency pulse in the power conversion module; the high voltage output module is used for boosting, rectifying and filtering the high frequency pulse and outputting direct current high voltage Uk; digital loop control is designed in the comprehensive signal processing system; and PWM (Pulse Width Modulation) control is compensated through sampling ray energy and power supplyvoltage fluctuationand real-time dynamic response is made in combination with a PID (Proportion Integration Differentiation) control algorithm, so that the influence of fluctuation in the power grid on an emission beam of the electron gun is eliminated. The sampled data is corrected according to the ambient temperature, so that the interference of ambient temperature variation in high voltage output stability is reduced, and the stability for long-term work of the electron gun is guaranteed.

The invention discloses a shaft coupling and side coupling mixed double-beam standing wave electron linear accelerator. Accelerating cavities and shaft coupling cavities are alternately connected to form a body of the double-beam standing wave electron linear accelerator, a metal short-circuit switch is arranged on a side coupling cavity, and the energy state of electron beam current is adjusted by adjusting the insertion length of the short-circuit switch into the side coupling cavity. Therefore, two energy states (high energy and low energy) of electron beam current are achieved through one standing wave electron linear accelerator, a multi-use machine is realized, and the size and cost of imaging and radiation therapy equipment are reduced.

The invention discloses a double-modulator control system of a medical electron linear accelerator. The double-modulator control system comprises a magnetron modulator, a grid-controlled electron gun modulator, a magnetron, a grid-controlled electron gun, an accelerating tube, three microwave detection circuits, a feedback microwave system, a therapeutic head, an automatic dosage control system and a digital signal processing system; the digital signal processing system is connected with the magnetron modulator and the grid-controlled electron gun modulator respectively, the magnetron modulator is connected with the magnetron, a microwave detection circuit is connected between the magnetron and the feedback microwave system, and the other two microwave detection circuits are connected between the inlet and the outlet of the accelerating tube and the feedback microwave system respectively; and the magnetron modulator, the three microwave detection circuits and the automatic dosage control system are connected with the digital signal processing system respectively, and the electron gun modulator is sequentially connected with the grid-controlled electron gun, the accelerating tube and the therapeutic head. The double-modulator control system realizes independent control, and can dynamically adjust the emission capacity of the electron gun in real time.

The invention discloses an energy switch for an on-axis electrical coupling standing wave accelerating tube. The on-axis electrical coupling standing wave accelerating tube comprises multiple accelerating cavities and coupling cavities arranged alternatively, wherein apertures are arranged among the accelerating cavities and the coupling cavities; circular holes are formed in the middle parts of the apertures; the energy switch comprises a platy front end and a pull rod at the back end; a circular hole is formed in the middle of the platy front end; the platy front end is inserted into the coupling cavities, and the pull rod stretches out of the side walls of the coupling cavities; and when the platy front end is inserted in a position where the circular hole in the platy front end coincides with the circular holes in the apertures, a circular waveguide structure is formed by the three circular holes. The energy multi-gear adjustability of a medical electron linear accelerator can be realized through insertion and pull-out of the energy switch.

The invention discloses an independent tuning microwave electron gun with external cathode which is composed of an external negative pole, namely, dipolar gun, a microwave cavity, a tuning mechanism, a first cavity input waveguide, a second cavity input waveguide and a cooling water pipe; the external negative pole and the microwave cavity are connected by Kovar flange argon-arc welding, the tuning mechanism and the microwave cavity are connected by braze welding in a hydrogen furnace, the first cavity input waveguide and the second cavity input waveguide are connected with the microwave cavity by braze welding, but the first cavity input waveguide and the second cavity input waveguide are connected at different longitudinal positions of the microwave cavity with the angles being mutually perpendicular, and then connected with a waveguide transmission line fed with microwave power respectively. The invention is designed to solve manufacture technique, so that the electron gun has simple structure and electron beam is excellent in performance, thus providing a novel electron beam source device for compact type free electron laser and electron linear accelerator.

Disclosed is an electron linear accelerator having dual purposes and a dual-purpose method of the electron linear accelerator. The electron linear accelerator comprises an accelerating tube, a scanning box, an industrial computed tomography (CT) and a beam deflection system, wherein the beam deflection system comprises a front quadrupole magnet, a deflection magnet, a rear quadrupole magnet and a scanning magnet; the front quadrupole magnet is arranged behind the accelerating tube, the deflection magnet is arranged behind the front quadrupole magnet, and the rear quadrupole magnet and the scanning magnet are arranged behind the deflection magnet; the industrial CT is arranged behind the rear quadrupole magnet and the scanning box is arranged behind the scanning magnet; and the deflection magnet is controlled to be opened or closed, and electronic beam current is selected for moving forwards in a linear mode or for deflecting at an alpha angle, so that the electronic beam current selectively enters the scanning box or the industrial CT. The electron linear accelerator having dual purposes and the dual-purpose method of the electron linear accelerator solve the problem that the requirements of dual purposes on electron beam spot sizes are contradictory. Under the condition that all performances meet the requirements, the cost is reduced. The electron linear accelerator having dual purposes and the dual-purpose method of the electron linear accelerator not only perform electron beam irradiation by using different energy but also generate X rays with different energy, and perform CT imaging.

The present invention discloses a standing wave linear accelerator, comprising: a microwave device configured to generate microwave; an electron beam emitting device configured to emit electron beam; an accelerating device configured to receive the microwave generated by the microwave device and form a microwave electric field, to accelerate electron beams generated from the electron beam emitting device and undertake the accelerated electron beam targeting to emit X ray beam; a synchronous device generating synchronous pulse signal; and a quick beam emitting device receiving the synchronous pulse signal generated by the synchronous device, wherein the microwave device runs and generates microwave in advance before the operation of the electron beam emitting device based on the synchronous pulse signal, and the quick beam emitting device drives the electron beam emitting device to emit electron beam after power of the microwave generated by the microwave device reaches stable state, so that the accelerating device emits X ray beam. In the accelerator, the microwave system and the electron beam emitting device do not work at the same time, and the accelerator electron beam emitting system is started only when the AFC is put into operation and runs stably.

The invention relates to an X-ray irradiation system with an electron linear accelerator as an electron beam source. The X-ray irradiation system is provided with a two-dimensional scanning deflection coil magnet ring, a super-large transmission type X-ray converter, and an extension irradiation protection room with a transverse repeated fold-back sample conveying mechanism, and can be used for carrying out automatic entering and exiting sample irradiation treatment continuously on articles which need ionizing radiation and irradiation sterilizing, insect-killing and disinfecting treatment such as Chinese patent medicine, food and flowers. The X-ray irradiation system has the advantages of being high in radiation conversion efficiency, radiation intensity and radiation penetration power, capable of irradiating automatic entering and exiting samples continuously, good in uniformity of irradiation dose and good in system radiation protection, and avoiding the environmental threat related to the radionuclide. The X-ray irradiation system can replace radioactive nucleus irradiation equipment widely adopted at present, get rid of dependence on a nuclear irradiation source from the irradiation industry and eliminate the potential threat of generating radioactive nuclear pollution to the environment.

The present invention provides a standing wave electron linear accelerator comprising a modulator and a magnetron for producing radio frequency microwaves; a plurality of accelerating tubes for accelerating electrons; a microwave transmission system for feeding the microwaves into the plurality of accelerating tubes; a plurality of electron guns for emitting electron beams into the plurality of accelerating tubes; a plurality of targets impinged by the electrons from a plurality of accelerating tubes to form continuous spectrums of X-rays; a plurality of shielding devices for shielding the continuous spectrums of X-rays generated by the targets; and a microwave distributor disposed adjacent to the end of the microwave transmission system, wherein the microwave distributor has a microwave inlet and a plurality of microwave outlets for distributing the microwaves in the microwave transmission system into the accelerating tubes.

The present invention provides a method for producing molybdenum-99 comprising: i) providing an electron accelerator; ii) providing a molybdenum converter / target unit (Mo-CTU) comprising one or more metallic components, wherein each one of said metallic components is made of a material selected from the group consisting of natural molybdenum, molybdenum-100, molybdenum-98, and mixtures thereof; iii) directing an electron beam generated via said electron accelerator onto said Mo-CTU to produce a braking radiation (bremsstrahlung); iv) employing said bremsstrahlung onto said Mo-CTU to produce molybdenum-99 and neutrons via a photo-neutron reaction; v) slowing down the neutrons produced in step iv) with a low atomic liquid, e.g. distilled water; and optionally vi) employing the neutrons produced in step iv) to produce a complementary amount of molybdenum-99 via a neutron capture reaction on said Mo-CTU. The invention further provides an apparatus for producing molybdenum-99.

The invention discloses an irradiation plant which can absorb residual electron beam that belongs to fields of radiation processing technology. It includes electron linear accelerator, electron beam drift scanning bracket which is connected with electron linear accelerator, mechanical transport mechanism which is mounted below the electron beam drift scanning bracket and on which the object to be irradiated is placed. It characterized in that an electron beam absorber is mounted just below the electron beam drift scanning bracket and at the bottom of the mechanical transport mechanism. The electron beam absorber and the electron linear accelerator are connected by leads to form an electronic loop to conduct heat. With this invention, the thickness of the inoxidizing coating in electron beam irradiation plant can be decreased, the cost can be saved, and the volume and weight can also be decreased, the local cumulation of charge and quantity of heat can be prevented to realize the self-sield and miniaturization of the electron beam irradiation plant, the applied range of the electron beam irradiation plant can be extended further more.

The invention provides a side coupling cavity structure and a standing wave electron linear accelerator where the side coupling cavity structure is used. The side coupling cavity structure is arranged on one side of an accelerating cavity and comprises a cavity, an upper coupling cavity column, a lower coupling cavity column, a piston channel and ceramic rings, wherein the upper coupling cavity column and the lower coupling cavity column are protruded out of the cavity; the piston channel is arranged beside the position of the center of the upper coupling cavity column and the lower coupling cavity column and penetrates through the cavity; and end face parts of the ceramic rings are metalized, and the ceramic rings are fixed on the upper coupling cavity column and the lower coupling cavity column through the metalized end face parts by seal welding. Due to the fact that a moving area of a piston in the side coupling cavity is not a vacuum area of an accelerating tube, a bellows does not need using, and not only is a whole device miniaturized, but also the pneumatic piston can be replaced conveniently without influencing functions of the accelerating tube. In addition, due to the fact that a ceramic material wall of a ceramic cylinder is thin, the influence on a capacitor caused by the inserted ceramic cylinder can be further reduced after the ceramic cylinder is inserted into the cavity.

The invention discloses a back-bombardment-preventing electron linear accelerator, which includes an electron gun, a 270-degree deflection box, a 270-degree deflection magnet and a linear accelerating tube. The central axis of the electron gun and the central axis of the linear accelerating tube are vertical to each other. The linear accelerating tube includes a plurality of coaxially arranged accelerating cavities, and a beam channel II is arranged at the central axis of the linear accelerating tube; the 270-degree deflection magnet is arranged on the outer side of the 270-degree deflection box, and is used for providing a deflection magnetic field with a 270-degree deflection angle to an electron beam located in the 270-degree deflection box; the 270-degree deflection box is arranged between the electron gun and the linear accelerating tube, the inside of the 270-degree deflection box is hollow, the inlet of the 270-degree deflection box is connected with the electron gun, and the output port of the 270-degree deflection box is connected with the inlet of the linear accelerating tube; and a beam channel I in the electron gun, the hollow cavity of the 270-degree deflection box and the beam channel II in the linear accelerating tube mutually communicate, and form a beam track of electron beam motion. The back-bombardment-preventing electron linear accelerator provided by the invention can protect normal work of the electron gun, and prevents damage caused by back bombardment electrons.

The invention discloses a switching power supply detection system used for an accelerator. The switching power supply detection system comprises a current sensor, a signal conditioning module, an A / D conversion module, a single-chip microcomputer, a communication module and an alarm module. According to the system, the operation state and the parameters of a switching power supply can be detected and mastered in real time, and the abnormal state of the power supply can be timely fed back to the host of the accelerator by a fault alarm function; the deviation of the preset value and the actual value of the switching power supply is reduced by an intelligent adjusting function, and output precision of the power supply is enhanced without artificial participation so that reliability of the whole system is enhanced; and intelligent adjusting time of the switching power supply is further reduced by a parameter memory function so that response speed of the system is enhanced and the intelligent adjusting function is enabled to have more practical value.

A local electron irradiation method and a device for a semiconductor chip are provided, which comprises placing a chip on an irradiation bed of an electron linear accelerator in the electron irradiation zone of the chip, and performing the local electron irradiation to the different zones on the semiconductor chip by using the partial mask electron irradiation method. The partial mask electron irradiation method, based on the principle that metal barrier can isolate electron rays, arranges electron ray-isolating metal barriers with different thicknesses in the parts apart from electron irradiation or in need of electron irradiation with different doses, thereby realizing the independence electron irradiation to individual zones on the semiconductor chip. In particular, the lead metal barrier is used to block the electron ray for the chip parts apart from electron irradiation, thereby realizing the local electron irradiation of individual zones on the semiconductor chip.

The invention discloses a medical electron linear accelerator, and the accelerator comprises a pedestal, a fixed rack disposed on the pedestal, a rotating rack fixed at the front side of the fixed rack, and a treatment couch disposed at the front side of the rotating rack. The rotating rack is provided with a treatment head and a digital display. The interior of the treatment head is provided with an acceleration device, a radiation device, and a temperature and inflation device. The radiation device is disposed at the lower end of the acceleration device, and the acceleration device comprises an electronic gun, an acceleration tube, an ion pump, a microwave transmission device, a microwave power source, and a pulse modulator. One end, close to the rotating rack, of the treatment couch is provided with a rotating device and a detector, and the other end of the treatment couch is provided with a holding device. The accelerator is simple in structure, is clear in graph, is easy for the adjustment of a rotating angle, and is convenient to use.

A particle accelerator system, including apparatuses and methods, for producing a beam of bunched charged particles at high intensities and with minimal energy dispersion comprises a bunching section having a plurality of bunching cavities, an accelerating section having a plurality of accelerating and coupling cavities, and an electromagnetic drive subsystem having a single radio-frequency (RF) generator coupled to the accelerating section at a single location. The accelerating and bunching sections are directly coupled and share a common wall, which may have a resonant coupling cavity therein, such that charged particles bunch in the bunching section and travel through the common wall into the accelerating section where they are accelerated and exit the particle accelerator system as a beam of bunched charged particles. Preferably, a phase shift of one hundred-eighty degrees (180°) (or it radians) is created between the electric fields of successive bunching cavities in the bunching section.

The invention discloses an electron linear accelerator source model building method and a building device. The method comprises steps: physical parameters of an initial virtual phase space source are acquired, the physical parameters are adopted for three-dimensional dose curve simulation, and the obtained three-dimensional dose curve through simulation and a three-dimensional dose curve measured by the electron linear accelerator are compared; when differences exist between the two, the physical parameters of the initial virtual phase space source are adjusted until the error between the obtained three-dimensional dose curve through simulation and the measured three-dimensional dose curve is in a preset range; and electron beams with different single energy and different beam spot sizes are pre-calculated, phase space files with different weights generated by a simulation reference accelerator machine head model, and the files are overlapped to generate the initial virtual phase space. By adopting the method and the device of the invention, in a condition of not acquiring the electron linear accelerator model, a high-precision source model building method is provided.

The invention discloses an electron linear accelerator with a hybrid acceleration structure. The electron linear accelerator comprises acceleration structures in two forms: a standing wave acceleration structure and a traveling wave acceleration structure; the standing wave acceleration structure is connected to the front end of the traveling wave acceleration structure; a coupling structure is arranged between the tail cavity of the standing wave acceleration structure and the head cavity of the traveling wave acceleration structure; the traveling wave acceleration structure is provided witha power feed-in port of an acceleration tube, the standing wave acceleration structure has a self-focusing function, and the traveling wave acceleration structure has the advantages of high efficiencyand no reflection, so that the accelerator does not need an isolator or an external magnetic field system, electron acceleration can be realized efficiently and compactly, and the cost of the whole machine is reduced.

The invention discloses a placement positioning device of a medical electron linear accelerator. A treatment table comprises upper bed boards and a lower bed board, wherein the two groups of upper bedboards are respectively connected with a rotary shaft fixed on the lower bed board; a longitudinal scissors fork mechanism and a horizontal scissors fork mechanism are respectively arranged between the two groups of upper bed boards and the lower bed board; the upper bed boards are in higher pair contact with an arc-shaped surface of an upper slideway; a scissors fork arm located at the outermostend on one side of the longitudinal scissors fork mechanism is hinged to a push-and-pull block; a nut is welded on the push-and-pull block; the nut is spirally matched with a screw; the parts near the two outer ends of the screw are rotatably connected with a bearing seat mounted on the lower bed board respectively; a locking mechanism is arranged between the upper slideway and a lower slideway on the lower bed board; and the placement positioning device also comprises an upper laser light, a left laser light, a right laser light, a left second-rate laser light and a right second-rate laser light. The treatment table adopts a double-layer bed board structure, so that the tilting motion of the treatment table is increased, the adjustability of the treatment table is improved, and the accurate placement positioning can be achieved rapidly and automatically.

The invention relates to an accelerator and an MRI(magnetic resonance imaging)-guided X-ray radiotherapy machine. The accelerator is provided with a magnetron, the magnetron comprises a tube core and a magnet, the magnet employs a master magnet of an MRI system, the tube core is arranged in a main magnetic field, generated by the main magnet, of the MRI system, the axial direction of the tube core is along the direction of the magnetic line of the main magnetic field; and the MRI-guided radiotherapy machine is composed of a radiotherapy machine and an online MRI device, the radiotherapy machine is provided with a linear accelerator and / or a cyclotron for acceleration of charged particles, the linear accelerator and the cyclotron are provided with a magnetron, the online MRI device is provided with a main magnet for forming an MRI main magnetic field, the tube core of the magnetron is arranged in the MRI main magnetic field, the MRI main magnetic field is taken as a constant magnetic field of the magnetron, and the linear accelerator is disposed outside the main magnet. The accelerator provided by the invention is smaller and more compact and generates higher-energy electron beams; and the radiotherapy machine is more compact and can rapidly and accurately deliver the beams to specific irradiation positions.

The invention discloses a method for automatic centering control of a medical accelerator beam. The method can be used for automatic computation and automatic adjustment of the symmetry degree and the uniformity of dosage of a medical electron linear accelerator. A designed ionization chamber is adopted for acquiring a medical accelerator beam signal and a deviation beam signal in the X direction or the Y direction, then a dosage rate symmetry error value between two symmetrical sub-ionization chambers is calculated, and the current orientation power supply value is obtained according to the dosage rate symmetry error value and an ideal orientation power supply value of an output orientation power supply; and then the position of the medical accelerator beam is adjusted and the dosage rate symmetry error is corrected by changing the medical accelerator output orientation power supply. In this way, the requirement for uniformity of the medical accelerator beam in the treatment field is met. Centering of the accelerator beam can be achieved quickly and effectively, and dosage uniformity in the treatment field is improved, and reliability is high.

A standing wave electron linear accelerating apparatus and a method thereof are disclosed. The apparatus comprises an electron gun configured to generate electron beams; a pulse power source configured to provide a primary pulse power signal; a power divider coupled downstream from the pulse power source and configured to divide the primary pulse power signal outputted from the pulse power source into a first pulse power signal and a second pulse power signal; a first accelerating tube configured to accelerating the electron beams with the first pulse power signal; a second accelerating tube configured to accelerate the electron beams with the second pulse power signal; a phase shifter configured to continuously adjust a phase difference between the first pulse power signal and the second pulse power signal so as to generate accelerated electron beams with continuously adjustable energy at output of the second accelerating tube.

The invention discloses an effective focus size regulating device and method for a double-cylindrical electron linear accelerator. The effective focus size regulating device is used for improving the industrial CT space resolution of the accelerator. The effective focus size regulating device comprises a fixing sleeve, a first cylindrical piece, a second cylindrical piece and a regulating device, the fixing sleeve comprises a square hole, both the first and second cylindrical pieces are mounted in the square hole, the square hole is used for fixing the first and second cylindrical pieces, each of the first and second cylindrical pieces comprises an arc-shaped surface, the arc-shaped surface of the first cylindrical piece is opposite to the arc-shaped surface of the second cylindrical surface, and the regulating device is used for regulating the distance between the arc-shaped surface of the first cylindrical piece and the arc-shaped surface of the second cylindrical piece. The effective focus size regulating device and method regulate the effective focus size of the ray of an original electron linear acceleration through changing the size of the gap between two cylindrical arc-shaped pieces of the device and the field angle between the cylindrical arc-shaped pieces. The effective focus size regulating device for the double-cylindrical electron linear accelerator is simple in structure, is convenient to operate, is low in cost, and does not change the inside structure of the existing electron linear accelerator.

Disclosed is a medical electron linear accelerator. The medical electron linear accelerator comprises a high-voltage pulse modulator, a microwave power source, a microwave transmission mechanism and an acceleration tube; the high-voltage pulse modulator is connected with the microwave power source; the microwave transmission mechanism is connected with the microwave power source and the acceleration tube separately; the microwave power source is fixedly mounted on a rack; the microwave transmission mechanism comprises a circulator or an isolator connected with the microwave power source, and multiple waveguides, wherein the multiple waveguides are connected in sequence through multiple waveguide rotary heads; the included angle between any two waveguides can be adjusted by the waveguide rotary heads optionally; the circulator or the isolator is connected with the first waveguide of the multiple waveguides; the acceleration tube is connected with the last waveguide of the multiple waveguides; and adjustment and movement of the space position of the acceleration tube can be realized under the driving of the multiple waveguides.