38results about How to "Reduce beam-loss" patented technology

The invention relates to a core column structure for improving a magnetic focusing force at a central area of a superconducting cyclotron. The core column structure comprises a core column body (4). The core column body (4) is divided into an upper part and a lower part. The lower part has a cylindrical structure. The upper part has a structure in which a plurality of magnetic pole valley areas (5) and a plurality of magnetic pole peak areas (1) are arranged alternatively. The magnet ring of the azimuth of each magnetic pole valley area (5) is step-shaped. Two side edges on the head surface of each magnetic pole peak area (1) are provided with chamfered corners (6). The core column structure for improving a magnetic focusing force at the central area of the superconducting cyclotron has advantages of improving the axial magnetic focusing force at the central area of the superconducting cyclotron, reducing particle acceleration high-frequency phase slippage at the central area, effectively reducing beam loss at the central area, improving acceptance degree of the beam at the central area, and improving strength of the beam which is introduced from an accelerator. The core column structure further has advantages of simple structure and high practicability.

The invention discloses a system and a method for improving beam current intensity distribution after leading an ion beam out. A positive bias current-conducting plate is added between the top part and the bottom part of a beam current path between a beam current leading-out system and a mass analysis magnet, wherein the positive bias current-conducting plate can generate an electric field so that part beam current is pressed to the middle part; a bias voltage can modulate beam current intensity to increase the beam current intensity, so that the beam current loss caused by the mass analysis magnet is compensated; and simultaneously, some nonlinear angle changes caused by the positive bias current-conducting plate is independently corrected by utilizing an angle controller. By using the system and the method, the beam current loss caused by an analysis magnet inlet can be reduced; high beam current transmission efficiency is achieved by greatly improving the beam current of an analysis magnet; and the density distribution of the beam current can be optimized more conveniently when the beam current uniformity distribution is adjusted.

The invention discloses a beam axial track adjustment device for a cyclotron. The device comprises a first electrostatic deflection apparatus and a second electrostatic deflection apparatus, and the first and second electrostatic deflection apparatuses have the same structure, and respectively comprise an upper electrode and a lower electrode, which are vertically symmetric relative to the centralplane of the cyclotron. The upper electrode of the first electrostatic deflection apparatus is disposed on the upper surface of a first peak zone magnetic pole in the cyclotron, and the lower electrode of the first electrostatic deflection apparatus is disposed on the lower surface of the first peak zone magnetic pole in the cyclotron. The upper electrode of the second electrostatic deflection apparatus is disposed on the upper surface of a third peak zone magnetic pole in the cyclotron, and the lower electrode of the second electrostatic deflection apparatus is disposed on the lower surfaceof the third peak zone magnetic pole in the cyclotron. The device can independently adjust the voltage differences between the upper and lower electrodes of the first and second electrostatic deflection apparatuses, carries out the axial track adjustment of a particle beam, and enables a beam deflecting from the central plane to return to the central plane.

The invention relates to an accelerator, aims at solving the problem that an existing electronic accelerator is low in average beam current power and cannot meet the using demand of the fields of material irradiation and the like, meanwhile gives consideration to using economical efficiency and provides an electronic helical accelerator. The electronic helical accelerator comprises a radio-frequency resonance cavity, a pair of ridge-shaped electrodes, a four-pole magnet, a deflection magnet, a beam current motion pore passage, a pore passage inlet, a pore passage outlet and a grid-control electronic gun, wherein the beam current motion pore passage comprises a beam current deflection pore passage and ridge-shaped electrode beam current pore passages, the four-pole magnet and the deflection magnet are arranged outside the beam current deflection pore passage, electronic beams led from the pore passage inlet is subjected to acceleration, focusing and deflection in the beam current motion pore passage and finally jet out of the pore passage outlet, and the whole acceleration process is finished. The electronic helical accelerator is high in radio-frequency utilization efficiency and good in using economical efficiency, effectively improves the average beam current power and can well meet the using demand of the fields of material irradiation and the like.

The invention discloses a proton beam flow intensity modulation method and system. In a proton therapy device based on a cyclotron, an energy selection module makes the transmission efficiency of the proton beam with different energies very different, but a treatment end requires the proton beam to maintain a stable flow intensity range. The method of the invention firstly obtains the beam loss and the transmission efficiency of the proton beam with different energies in an energy reduction process after the energy modulation of the proton beam, and obtains a flow intensity ratio from low energy to high energy. According to the clinical requirements of the proton beam flow intensity dynamic ratio, after different energy points which have been subjected to energy modulation undergo expansion and collimation, the flow intensity modulation within a design proportional region is completed and the flow ratio can be controlled within a certain value. The method and the system of the invention are based on the Monte Carlo calculation method and the beam optics. The design method is reliable, and the realization scheme has a small space requirement, which is important for maintaining the beam stability in the proton therapy process.

A manufacturing method of a waveguide structure includes forming a metal layer of a predetermined size on a substrate to form a structure, forming a lower clad layer on the structure in order to completely cover the metal layer, forming a core layer of a predetermined size on the lower clad layer at the location corresponding to the metal layer, and forming an upper clad layer thereon in order to completely cover the core layer.

The invention discloses a high-precision electromagnetic combined measurement method and a negative hydrogen cyclotron based on the method, and belongs to the technical field of high-current proton cyclotron electromagnetic field characteristic and electric field distribution measurement. The measurement method comprises the following steps: measuring a strong-current negative hydrogen ion beam generation process; measuring a high-current negative hydrogen ion beam transmission process; measuring a high-current negative hydrogen ion beam injection process; measuring a high-current negative hydrogen ion beam acceleration process; and measuring a high-current negative hydrogen ion beam extraction process; The invention further discloses the compact high-average-flow-intensity negative hydrogen cyclotron based on the high-precision electromagnetic combined measurement method; the measurement method runs through the whole process of generation, transmission, strong injection, accelerationand extraction of strong-flow negative hydrogen ions; through the cooperation technology of all links of installation, combination and debugging in the overall integration process of a main magnet assembly, a high-frequency subsystem, an injection and extraction subsystem, a double-layer sealed vacuum chamber and other systems, the problem of beam loss in all links of beam injection, accelerationand extraction is solved.

The invention discloses a plasma window windowless seal-based liquid-state metal spallation neutron target device. The liquid-state metal spallation neutron target device comprises a plasma window and a liquid-state metal target, wherein the plasma window is arranged at the front end of the liquid-state metal target; the liquid-state metal target further comprises a liquid container; a liquid-state metal target material is held in the liquid container; a high-pressure cavity, a heat exchanger and a liquid-state metal circulating pipeline are arranged in the liquid container; the high-pressure cavity is arranged on the top of the liquid container; an opening is formed in the center of the bottom of the high-pressure cavity; a particle beam is in contact with a part bombarded by the beam through the opening; the heat exchanger is arranged on the inner wall of the liquid container to discharge heat to the exterior; and the metal liquid circulates in the liquid container through the liquid-state metal circulating pipeline. According to the plasma window windowless seal-based liquid-state metal spallation neutron target device, windowless seal of the liquid-state metal target is realized; the beam loss of the particle beam in a passage of the plasma window is reduced; the gasification of the liquid-state metal is reduced; and the steam of the metal entering a vacuum pipeline is reduced.

A hologram recorder (A2) includes: a light source (10) for emitting a coherent beam; a spatial light modulator (20) provided with unit areas having a plurality of beam reflection elements (21) to reflect the beam from the light source (10) in a main direction as a signal beam or a cut-off direction; and a signal beam optical system (30, 31) for directing the signal beam to the hologram recording medium B. The recorder (A2) further includes: a wavefront reshaper (40, 41, 42) for condensing the beams thinned out in the cut-off direction by the beam reflection element (21) of the modulator (20), and reshaping the wavefront of the condensed beams; and a reference beam optical system (50, 51) for directing the beam from the reshaper (40, 41, 42) to the recording medium (B) as a reference beam to be shone in an overlapping manner with the signal beam.

The invention discloses a high-frequency ultra-short electron gun grid regulation and control pulse power supply system, which mainly comprises the following four schemes: a high-frequency ultra-shortelectron gun grid regulation and control pulse power supply system for generating voltage-multiplying pulses, a high-frequency ultra-short electron gun grid regulation and control pulse power supplysystem for directly generating high-frequency ultra-short pulses, a high-frequency ultra-short electron gun grid regulation and control pulse power supply system for generating frequency-multiplying and phase-adjustable pulses, and a high-frequency ultra-short electron gun grid regulation and control pulse power supply system for directly generating polarity and phase-adjustable pulses. Output ofvoltage-multiplying pulses, high-frequency ultra-short pulses, frequency-multiplying and phase-adjustable pulses and polarity and phase-adjustable pulses is realized respectively.

A manufacturing method of a waveguide structure includes forming a metal layer of a predetermined size on a substrate to form a structure, forming a lower clad layer on the structure in order to completely cover the metal layer, forming a core layer of a predetermined size on the lower clad layer at the location corresponding to the metal layer, and forming an upper clad layer thereon in order to completely cover the core layer.

The invention provides a moving target for neutron generation. The moving target comprises a vacuum cavity, a moving device and a target body, wherein the moving device and the target body are installed in the vacuum cavity; the moving device is installed on the inner wall of the top of the vacuum cavity; the target body is detachably installed on the moving device through a hook assembly, and the moving device can control the reciprocating motion of the target body. The moving device is adopted to control the target body to move left and right in a reciprocating mode, so that the problem of high local heat caused by flow beam concentration of an existing static target is solved, heat deposition of the target body in unit volume is effectively reduced, the heat concentration peak value of the target body is also reduced, and the requirement for proton beam beams is reduced.

The invention relates to an inclusive light ion tumor treatment device. The inclusive light ion tumor treatment device comprises an ion source, a linear injector, a synchrotron, and a treatment terminal; the ion source comprises a shell and further comprises an air inlet pipeline, an evaporation furnace and a waveguide tube which are arranged in the shell; the input end of the linear injector is connected with the output end of the ion source through a low-energy beam transport line; the linear injector comprises an acceleration cavity and a magnetic focusing element sleeving the outer part of the acceleration cavity; the input end of the synchrotron is connected with the output end of the linear injector through a middle-energy beam transport line; a beam input end of the synchrotron is provided with an injection cutting magnet, an injection convex rail magnet and an injection electrostatic deflection plate; and the treatment terminal is connected with the synchrotron through a high-energy beam transport line. The device provided by the invention not only can utilize protons to carry out systemic treatment, but also can utilize light ion beams such as 3He, 4He and 7Li to carry out superficial layer (less than or equal to 8cm) tumor treatment.

The invention discloses a high-energy hydrogen ion implantation method and device. The device is characterized in that a negative hydrogen ion source is located at the left side of a main accelerator,and is in sealed connection with an inlet of the main accelerator through a rubber ring; a first magnetic lens is arranged between the outlet of the negative hydrogen ion source and the inlet of themain accelerator; a cryogenic pump and a molecular pump are respectively positioned on an upper cover plate and a lower cover plate of the main accelerator; electrodes of the main accelerator comprisean intermediate electrode and a high-voltage electrode, and the intermediate electrode and the high-voltage electrode are electrified by a high-voltage power supply to form an electric field to accelerate ions; a stripping film is located on the high-voltage electrode, negative hydrogen ions are converted into protons, and a second magnetic lens is arranged between an outlet of the main accelerator and a scanning deflection device. The device is compact in structure, the same group of electrodes are used for carrying out two-stage acceleration on ions, the number of the electrodes is reduced,the size of the whole accelerator is smaller, and the manufacturing cost is lower. In addition, energy control and linkage can be accurately realized, and stable and high-energy ions can be obtained.

The present invention addresses the problem of providing a graphite sheet for a beam sensor with which excellent yield can be obtained during laser processing. The graphite sheet for a beam sensor according to the present invention is characterized in that the a-b plane surface does not include eye-shaped protrusions.

The invention discloses a plasma window windowless seal-based liquid-state metal spallation neutron target device. The liquid-state metal spallation neutron target device comprises a plasma window and a liquid-state metal target, wherein the plasma window is arranged at the front end of the liquid-state metal target; the liquid-state metal target further comprises a liquid container; a liquid-state metal target material is held in the liquid container; a high-pressure cavity, a heat exchanger and a liquid-state metal circulating pipeline are arranged in the liquid container; the high-pressure cavity is arranged on the top of the liquid container; an opening is formed in the center of the bottom of the high-pressure cavity; a particle beam is in contact with a part bombarded by the beam through the opening; the heat exchanger is arranged on the inner wall of the liquid container to discharge heat to the exterior; and the metal liquid circulates in the liquid container through the liquid-state metal circulating pipeline. According to the plasma window windowless seal-based liquid-state metal spallation neutron target device, windowless seal of the liquid-state metal target is realized; the beam loss of the particle beam in a passage of the plasma window is reduced; the gasification of the liquid-state metal is reduced; and the steam of the metal entering a vacuum pipeline is reduced.

The invention mainly relates to a method and a device for accumulating beams and increasing ion numbers in a synchrotron for cancer therapy with heavy ion beams. The method comprises the following steps: 1. implanting the ion beams provided by an implanting device into the synchrotron; 2. in an electronic cooling device, generating electron beams with the same average velocity as the cooled ion beams; 3. deflecting the electron beams to a cooling section on the synchrotron; 4. enabling the ions to pass through the cooling section to collide with the electrons to act so as to cool the heavy ion beams; 5. deflecting the electrons after acting out. The invention also provides the device. Quadrupolar magnets and helix compensating tubes are sequentially arranged at the upper part of the straight section of the synchrotron; correcting magnets are arranged at the upper parts and lower parts of the helix compensating tubes; the arrangement at the lower part and the upper part of the straightsection of the synchrotron is the same and corresponding; a beam cooling device is arranged in the middle section of the straight section of the synchrotron. The invention has the advantages that theion numbers are obviously increased, the emittance and momentum spread of the ion beams are reduced, the beam quality is improved and the beam life is lengthened.

The invention relates to a universal light ion tumor treatment device, comprising: an ion source, an ion source enclosure, an air inlet pipe, an evaporation furnace and a waveguide arranged in the housing; a linear injector, a linear injector The input end of the synchrotron is connected to the output end of the ion source through a low-energy beam line. The linear injector includes an acceleration cavity and a magnetic focusing element sleeved outside the acceleration cavity; for a synchrotron, the input end of the synchrotron is connected to a linear ion source through a medium-energy beam line. The output end of the injector is connected, and the beam input end of the synchrotron is provided with an injection cutting magnet, an injection convex rail magnet and an injection electrostatic deflection plate; the treatment terminal is connected with the synchrotron through a high-energy beam line. The device of the present invention can not only use protons for whole body therapy, but also can use 3 He, 4 He, 7 Li and other light ion beams are used for superficial (≤8cm) tumor treatment.

An overmoded distributed interaction network is provided that generates high peak and average RF power amplification at high frequencies. A series of overmoded cavities are bounded by parallel or concentric grids that may be separated by metallic spacers adapted to function as a photonic bandgap circuit to suppress competing electromagnetic modes. The selected electromagnetic modes have wavelengths much shorter than the lateral dimension of the grids, allowing the beam-wave interaction to be distributed transversely for improved interaction efficiency. The grids may optionally be slotted and arranged to provide a serpentine traveling wave tube configuration.

The invention discloses a system and a method for improving beam current intensity distribution after leading an ion beam out. A positive bias current-conducting plate is added between the top part and the bottom part of a beam current path between a beam current leading-out system and a mass analysis magnet, wherein the positive bias current-conducting plate can generate an electric field so that part beam current is pressed to the middle part; a bias voltage can modulate beam current intensity to increase the beam current intensity, so that the beam current loss caused by the mass analysis magnet is compensated; and simultaneously, some nonlinear angle changes caused by the positive bias current-conducting plate is independently corrected by utilizing an angle controller. By using the system and the method, the beam current loss caused by an analysis magnet inlet can be reduced; high beam current transmission efficiency is achieved by greatly improving the beam current of an analysis magnet; and the density distribution of the beam current can be optimized more conveniently when the beam current uniformity distribution is adjusted.

The invention discloses a method for improving beam current intensity and angle distribution in an ion implantation system. Based on current intensity distribution and angle distribution data measured by beam current measurement equipment, the method comprises the following steps of: S1, regulating the driving currents of two dipolar magnets so that the beam currents at the top and the bottom of a beam current path between a leading-out system and a mass analysis magnet deflect to the middle; and S2, regulating a beam current uniformity controller and / or a calibrator so that the beam currents at the top, the middle and the bottom of the beam current path of ion beams in a preset energy range after passing through the calibrator are propagated in parallel. The invention also discloses the ion implantation system. By the method, the beam currents passing through the mass analysis magnet can be greatly promoted and high beam current transmission efficiency can be acquired.

A control method of a synchrotron, which includes: accelerating charged particles to the first extraction energy through a radio frequency electric field; increasing the voltage value of the radio frequency electric field to a deceleration voltage value; changing the synchronous phase of the radio frequency electric field so that the radio frequency electric field is applied to the charged particles and moves The force in the opposite direction maintains the deceleration voltage value so that the energy of the charged particles decreases until the energy of the charged particles decreases from the first extracted energy to the second extracted energy. The voltage value of the radio frequency electric field is raised first, and the voltage value of the radio frequency electric field is kept at the higher voltage value to decelerate the charged particles, which can reduce the longitudinal loss caused by the beam current during the process of reducing to the second extraction energy. While increasing the voltage of the radio frequency electric field, the magnetic field intensity of the focusing quadrupole iron is increased or the magnetic field intensity of the defocused quadrupole iron is decreased, and the magnetic field intensity of the hexapole iron is decreased, which can reduce the beam current in the process of reducing to the second extraction energy Losses caused by the lateral direction.

The invention relates to a vacuum exhaust system of a superconducting cyclotron. The vacuum exhaust system comprises a first exhaust passage, a second exhaust passage and a third exhaust passage, wherein the first exhaust passage is arranged in a high-frequency inner rod (7) of a high-frequency system of the superconducting cyclotron; the second exhaust passage is arranged between the high-frequency inner rod (7) of the high-frequency system and a high-frequency outer conductor (4); the third exhaust passage is arranged between the high-frequency outer conductor (4) of the superconducting cyclotron and a main magnet cover plate (2); and the first exhaust passage, the second exhaust passage and the third exhaust passage all carry out exhausting through a D plate (5) arranged at the end part of the high-frequency inner rod (7). By the vacuum exhaust system of the superconducting cyclotron, a plurality of vacuum exhaust passages are arranged according to the structural design characteristic of the high-frequency system, so that conductance of vacuum exhausting of the superconducting cyclotron is improved; the vacuum pumping rate of the superconducting cyclotron is improved; the beam loss is reduced; and the beam quality is improved.

The invention discloses a strong magnetic field synchronous cyclotron and a magnetic field supplementing method thereof, wherein the magnetic pole of an accelerator is of a circumferential structure,and the surface of the magnetic pole is a continuous curve; the method comprises the following steps of acquiring the actually needed magnetic field supplementing amount; in the radius range capable of being processed, enabling the continuous curve to be equivalent to a series of rectangular blocks with the fixed radial width and the height to be solved, and constructing a shape function of the continuous curve, wherein the shape function represents the variation of the magnetic field corresponding to the rectangular blocks; calculating the shape function of the unit height at each radius value position; performing discretization on the actually needed magnetic field supplementing amount, and working out the heights of the rectangular blocks based on the calculated shape function of the unit height at each radius value position and the discretized magnetic field supplementing amount through a function fitting algorithm; and machining the surface of the magnetic pole according to the obtained heights of the rectangular blocks. According to the method, correction of the specified magnetic field amount is realized by adopting a mode of processing the magnetic pole surface curve, the matching degree of the magnetic field and the high-frequency curve is finally improved, and the beam loss is lowered.

The invention relates to a vacuum exhaust system of a superconducting cyclotron. The vacuum exhaust system comprises a first exhaust passage, a second exhaust passage and a third exhaust passage, wherein the first exhaust passage is arranged in a high-frequency inner rod (7) of a high-frequency system of the superconducting cyclotron; the second exhaust passage is arranged between the high-frequency inner rod (7) of the high-frequency system and a high-frequency outer conductor (4); the third exhaust passage is arranged between the high-frequency outer conductor (4) of the superconducting cyclotron and a main magnet cover plate (2); and the first exhaust passage, the second exhaust passage and the third exhaust passage all carry out exhausting through a D plate (5) arranged at the end part of the high-frequency inner rod (7). By the vacuum exhaust system of the superconducting cyclotron, a plurality of vacuum exhaust passages are arranged according to the structural design characteristic of the high-frequency system, so that conductance of vacuum exhausting of the superconducting cyclotron is improved; the vacuum pumping rate of the superconducting cyclotron is improved; the beam loss is reduced; and the beam quality is improved.

The invention discloses a high-frequency ultra-short electron gun grid-regulated pulse power supply system, which mainly includes a high-frequency ultra-short electron gun grid-regulated pulse power supply system for generating high-frequency ultra-short pulses, and a high-frequency ultra-short pulse power system for directly generating high-frequency ultra-short pulses. Electron gun grid control pulse power supply system, used to generate frequency multiplied, phase adjustable high-frequency ultra-short electron gun grid control pulse power system and used to directly generate polarity, phase adjustable high-frequency ultra-short electron gun grid control pulse There are four schemes for the power supply system, which respectively realize the output of voltage-doubled pulses, high-frequency extremely short pulses, frequency doubled pulses with adjustable phases, and pulses with adjustable polarity and phases.

The invention discloses a method for improving the cutting precision of a screw tap and prolonging the service life of the screw tap. The method comprises the following steps that firstly, grease is brushed off from a cutter seam of the screw tap, and then the screw tap is put into an ultrasonic cleaning tank for deoiling cleaning, then is dehydrated and air-dried, and then is put into a vacuum chamber; a gas ion source of a cold cathode is started, argon ions are adopted to bombard the surface of the screw tap, then an arc ion source is started, arc discharge is formed, arc discharge is generated on a graphite cathode target, and then carbon plasma is generated in an anode cylinder; the carbon plasma is led out of a discharge chamber through an electrode and filtered through a magnetic field, neutral and polymolecular graphite particles are filtered out, and a single carbon ion flow is formed; and the single carbon ion flow is focused through a magnetic lens to form an ion beam, and the ion beam is scanned through a deflection magnetic field and matched with a rotary table to form a deposition surface to be deposited on the screw tap, so that an amorphous tetrahedron carbon coating is formed.

The invention relates to an accelerator, aims at solving the problem that an existing electronic accelerator is low in average beam current power and cannot meet the using demand of the fields of material irradiation and the like, meanwhile gives consideration to using economical efficiency and provides an electronic helical accelerator. The electronic helical accelerator comprises a radio-frequency resonance cavity, a pair of ridge-shaped electrodes, a four-pole magnet, a deflection magnet, a beam current motion pore passage, a pore passage inlet, a pore passage outlet and a grid-control electronic gun, wherein the beam current motion pore passage comprises a beam current deflection pore passage and ridge-shaped electrode beam current pore passages, the four-pole magnet and the deflection magnet are arranged outside the beam current deflection pore passage, electronic beams led from the pore passage inlet is subjected to acceleration, focusing and deflection in the beam current motion pore passage and finally jet out of the pore passage outlet, and the whole acceleration process is finished. The electronic helical accelerator is high in radio-frequency utilization efficiency and good in using economical efficiency, effectively improves the average beam current power and can well meet the using demand of the fields of material irradiation and the like.