53 results about "Radio-frequency quadrupole" patented technology

A system for forming one or more detachable semiconductor films capable of being free-standing. The apparatus includes an ion source to generate a plurality of collimated charged particles at a first energy level. The system includes a linear accelerator having a plurality of modular radio frequency quadrupole (RFQ) elements numbered from 1 through N successively coupled to each other, where N is an integer greater than 1. The linear accelerator controls and accelerates the plurality of collimated charged particles at the first energy level into a beam of charge particles having a second energy level. RFQ element numbered 1 is operably coupled to the ion source. The system includes an exit aperture coupled to RFQ element numbered N of the RFQ linear accelerator. In a specific embodiment, the system includes a beam expander coupled to the exit aperture, the beam expander being configured to process the beam of charged particles at the second energy level into an expanded beam of charged particles. The system includes a process chamber coupled to the beam expander and a workpiece provided within the process chamber to be implanted

A radio-frequency quadrupole ion guide having a symmetrical magnetic field disposed along an axis of the ion guide, wherein the system provides prolonged interaction between electrons and uncharged compounds within an ionization volume of the ion guide, resulting in enhanced ion creation.

The invention relates to a method and apparatus for control of a charged particle cancer therapy system. A treatment delivery control system is used to directly control multiple subsystems of the cancer therapy system without direct communication between selected subsystems, which enhances safety, simplifies quality assurance and quality control, and facilitates programming. For example, the treatment delivery control system directly controls one or more of: an imaging system, a positioning system, an injection system, a radio-frequency quadrupole system, a ring accelerator or synchrotron, an extraction system, a beam line, an irradiation nozzle, a gantry, a display system, a targeting system, and a verification system. Generally, the control system integrates subsystems and / or integrates output of one or more of the above described cancer therapy system elements with inputs of one or more of the above described cancer therapy system elements.

A portable neutron generator includes a Radio Frequency Quadrupole linear accelerator designed to accelerate charged particles of hydrogen (protons) to energies useful for producing neutrons with the (p,n) reaction on lithium. The ion source is driven by a coaxial feed and a spiral antenna to couple the microwave power into the plasma. The linear accelerator is driven by a 600 MHz pulsed RF power supply. A differential pumping scheme is used to balance the need for a high gas load on the ion source end and good vacuum on the accelerator end.

The invention relates to a method and apparatus for control of a charged particle cancer therapy system. A treatment delivery control system is used to directly control multiple subsystems of the cancer therapy system without direct communication between selected subsystems, which enhances safety, simplifies quality assurance and quality control, and facilitates programming. For example, the treatment delivery control system directly controls one or more of: an imaging system, a positioning system, an injection system, a radio-frequency quadrupole system, a ring accelerator or synchrotron, an extraction system, a beam line, an irradiation nozzle, a gantry, a display system, a targeting system, and a verification system. Generally, the control system integrates subsystems and / or integrates output of one or more of the above described cancer therapy system elements with inputs of one or more of the above described cancer therapy system elements.

The invention relates to a method and apparatus for control of a charged particle cancer therapy system. A treatment delivery control system is used to directly control multiple subsystems of the cancer therapy system without direct communication between selected subsystems, which enhances safety, simplifies quality assurance and quality control, and facilitates programming. For example, the treatment delivery control system directly controls one or more of: an imaging system, a positioning system, an injection system, a radio-frequency quadrupole system, a ring accelerator or synchrotron, an extraction system, a beam line, an irradiation nozzle, a gantry, a display system, a targeting system, and a verification system. Generally, the control system integrates subsystems and / or integrates output of one or more of the above described cancer therapy system elements with inputs of one or more of the above described cancer therapy system elements.

Sub-nanosecond single ion beam pulses are generated by means of one embodiment of the invention. In this embodiment, an ion source provides ions to a radio frequency quadrupole linear accelerator comprising electrodes. A power source is used to apply radio frequency alternating currents to the electrodes. A device is used to inject ions from the ion source to the accelerator, causing the accelerator to provide only a single sub-nanosecond output beam pulse at a time.

The invention relates to the technical field of ion acceleration equipment, in particular to a mixed ion acceleration device. The device comprises a cavity, a radio frequency quadrupole field and a drift tube are arranged on the same center line in the cavity, a foundation plate is correspondingly arranged on the joint of the radio frequency quadrupole field and the drift tube, two T-shaped plates are symmetrically arranged in the cavity in an up-down mode, the two ends of the cavity are provided with end plates, the radio frequency quadrupole field comprises two bar type electrodes, the two adjacent bar type electrodes are installed on the T-shaped plates through an electrode support and an electrode support supporting rod, and electrode supporting contact parts are arranged between the electrode support and the bar type electrodes. The drift tube is of a multi-segment structure, each segment of drift tube is installed on the corresponding T-shaped plate through a drift tube supporting rod, the gap between every two adjacent drift tubes is of an interactive phase bunching structure, and the drift tube supporting rods are designed in an interdigitated H type. By means of the device, a lot of space and cost are saved, and the device is more economical and practical and has high transmission efficiency, high gradient acceleration ability and high power acceleration efficiency.

This invention provides a article aerosol on-line ionization power, which is arranged outside the speeding area of the flying time quality analysis device, which includes ionization laser, low pressure radio frequency four poles, and the laser beam sent from the ionization laser is eradiated into the incenter of the low pressure radio frequency four poles vertically. The ionization power applying method has the following steps: measuring diameter of the single grain aerosol by aerodynamics, then before the flight time quality analyzer enters, iorizating the single grain into plasma, and the positive-negtive ions produced is focalized into ion beam which has very little spcace and then is sent into the flight time quality analyzer. And this invenktion also combining the ionization zone with the aerodynamics diameter measuring zone together, when diameter measuring is done, aerosol inoizates, which reduces the excursion distance of the aerosol, an improves transmission efficient greatly;and low-voltage radio-frequency quadrupole pole's concentrating effect improves the differentiate rate of the flight time quality analyzer.

The invention relates to the technical field of an acceleration mechanism of an ion accelerator, in particular to a bent wing-type radio-frequency quadrupole accelerator. The bent wing-type radio-frequency quadrupole accelerator is characterized by comprising a cavity, wherein four wings are arranged in the cavity, end plates are respectively arranged at the two ends of the cavity, a beam hole is arranged at the central position of each end plate, the central line of the two beam holes and the central axis of the cavity are on the same straight line, and a Pi-model stabilization rod and a tuner for adjusting frequency are further arranged on the cavity. By bending wings at pole head parts, the cross section size of the cavity is greatly reduced on the condition of no change on the total transverse length of the wings, and the bent wing-type radio-frequency quadrupole accelerator is very suitable for low-frequency beams; and meanwhile, due to the compatibility with the advantages of simplicity and effectiveness of a cooling system of the traditional four-wing radio-frequency quadrupole acceleration mechanism, the bent wing-type radio-frequency quadrupole accelerator is very suitable for a continuous-wave working state. Obvious advantages are shown on the aspects of reduction on processing difficulty of the radio-frequency quadrupole accelerator, reduction on engineering cost, improvement on running reliability and stability of a device and the like.

The invention relates to the technical field of measuring a complex three-dimensional space curved surface with a three-coordinate measuring machine, in particular to a method for measuring the three-dimensional space curved surface of a radio-frequency quadrupole-field electrode pole head by the aid of three coordinates. The method includes: establishing a three-dimensional mathematical model for an RFQ (radio frequency quadrupole) electrode, and guiding the mathematical model into measuring software to compile a measuring program; placing the RFQ electrode into a three-coordinate measuring machine, and centering the same first manually and then by the aid of the program; compiling the measuring program; measuring an RFQ electrode pole head curve with a scanning probe and the peak of the electrode pole head; measuring electrode pole head surface points by the aid of a vector method. By the aid of the three-coordinate measuring machine, measuring of the complex three-dimensional space surface can be completed with high measuring precision and measuring efficiency, and machining detection level of the RFQ electrode pole head is greatly improved; machining precision of products is guaranteed, working efficiency is improved, and machining error can be reflected visually.

The invention relates to a welding method of a four-wing octagonal radio frequency quadrupole cavity. The welding method includes the steps that finish machining is conducted on the inner surfaces and the outer surfaces of electrodes and side wings; the electrodes and the side walls are cleaned; electrode soldering flux tanks are arranged, and soldering flux filling is conducted; the electrodes and the side wings are combined and spliced; the assembling gap of welding faces is measured and regulated; and a vacuum cavity is formed by welding the electrodes and the side wings through a vacuum brazing furnace. The cavity prepared through the method mentioned above comprises the horizontal electrodes, the vertical electrodes and the side wings; and the corresponding electrode soldering flux tanks are arranged on the two sides of each electrode, the soldering flux tanks are filled with silver-copper alloy soldering flux, and the size of the soldering flux welding tanks is regulated according to the size of the welding faces. The welding method has the beneficial effects that the welding process is simple; by selecting the soldering flux and controlling the temperature of the welding process, outflow of the soldering flux towards the interior of the cavity is reduced to a great extent, and the soldering flux is uniformly diffused; and no soldering flux exits in the cavity, the problem that high-pressure ignition is generated when the RFQ cavity operates at a high frequency can be solved, and normal operation of the RFQ cavity is ensured.

A system for forming one or more detachable semiconductor films capable of being free-standing. The apparatus includes an ion source to generate a plurality of collimated charged particles at a first energy level. The system includes a linear accelerator having a plurality of modular radio frequency quadrupole (RFQ) elements numbered from 1 through N successively coupled to each other, where N is an integer greater than 1. The linear accelerator controls and accelerates the plurality of collimated charged particles at the first energy level into a beam of charge particles having a second energy level. RFQ element numbered 1 is operably coupled to the ion source. The system includes an exit aperture coupled to RFQ element numbered N of the RFQ linear accelerator. In a specific embodiment, the system includes a beam expander coupled to the exit aperture, the beam expander being configured to process the beam of charged particles at the second energy level into an expanded beam of charged particles. The system includes a process chamber coupled to the beam expander and a workpiece provided within the process chamber to be implanted.

The invention provides a compact radio-frequency quadrupole 'RFQ' accelerator for accelerating charged particles, wherein the RFQ accelerator comprises: a bunching section configured to have a narrow radio-frequency 'rf' acceptance such that only a portion of a particle beam incident on the bunching section is captured, and wherein the bunching section bunches the portion of the particle beam; an accelerating section for accelerating the bunched portion of the particle beam to an output energy; and, a means for supplying radio-frequency power.

The invention relates to the technical field of manufacturing of core parts of a linear accelerator four-vane radio frequency quadrupole field cavity, in particular to a method for manufacturing a high-precision single vane of a four-vane radio frequency quadrupole field cavity. The method comprises the steps that a water-cooling hole is drilled in the bottom of the single vane by means of a deep hole drill machine tool; semifinishing is conducted by means of tools, finish machining is conducted on the inner cavity surface of the single vane by means of an end mill at the vertical machining centre, and alignment of the single vane is conducted at the horizontal machining centre by means of a lever-type dial indicator; the pole surface of the single vane is machined by means of a forming tool special for semifinishing, and then rough machining of the pole curved surface is conducted by means of the semifinishing tool; a modulation line of a pole of the single vane is machined by means of a tool special for finish machining, and the machining precision of the modulation line of the single vane is detected by means of a three-coordinate measuring instrument; finally, surface acid pickling is conducted on all the single vanes. The single vane manufactured with the method is high in precision and surface smoothness, and the field frequency stability, field flatness and field symmetry degree of online measurement after assembly are high and extremely identical with theoretical values.

The invention provides a method for accelerating protons and carbon ions up to 450 MeV / u in a very compact linac, the method comprising subjecting the particles to a radio frequency quadrupole field to accelerate the particles to at least 3 MeV / u, a drift tube linac (DTL) to an energy of 20 MeV / u, followed by a coupled DTL to 45 MeV / u and finally a high-gradient section made of CCL-type standing wave cavities or negative harmonic traveling wave cavities operating at S-band frequencies and capable of delivering voltage gradients of 40 to 60 MV / m. Focusing the accelerated particles while accelerated to higher energy is provided by appropriately placed constant field permanent magnets and electromagnetic quadrupoles. The compactness and power efficiency of the linac is enabled by using high-gradient structure in the S-band frequencies for lower energy particles than ever before. The low-intensity required for hadron therapy allows the use of small-aperture S-band structures and the operation at very high gradient compared to high-intensity machines for research. Operating with very short sub-microsecond pulses at repetition rates up to 400 Hz allows the fast and flexible beam energy and intensity tuning not provided by existing hadron therapy machines. The designed linac is capable of accelerating ions as heavy as neon to the full 450 MeV / u energy, therefore allowing fast beam switching if different ion sources are installed in the front-end of the linac.

A method for realizing gas phase molecule ¿C ion reaction based on radio frequency quadrupole rod includes imposing electric field on said quadrupole rod to let ion analyzed obtain kinetic energy and to let it generate molecule ¿C ion reaction with background gas molecule to generate subion of ion to be analyzed, using mass analyzer to measure subion for realizing cascade mass spectrum analysis of ion to be analyzed. A device of gas phase molecule ¿C ion reactor based on radio frequency quadrupole rod is also disclosed.

The invention relates to the technical field of a new manufacturing process of hydrogen furnace brazing of a four-airfoil-type radio frequency quadrupole-field accelerator cavity, in particular to a four-airfoil-shape radio frequency quadrupole-field accelerator cavity hydrogen furnace brazing method. According to the method, during brazing, brazed parts are assembled and fixed so that mutual positions of the parts and welding gaps required during brazing can be guaranteed. A brazing clamp is used in the whole part brazing processes of fixing, assembling, entering a furnace, brazing and discharging out of the furnace, and whether the clamp is reasonable and practical influences brazing quality directly. After a brazing mode of a new fastening structure is adopted, the success rate of cavity welding is greatly increased, the resistance on the surface of the welded cavity is small, conductivity performance is good, stability is good, the appearance size is small, the shape is little changed, vacuum indexes are good, and the overall performance of the four-airfoil-shape radio frequency quadrupole-field (RFQ) accelerator cavity is improved.

The invention relates to a method and apparatus for control of a charged particle cancer therapy system. A treatment delivery control system is used to directly control multiple subsystems of the cancer therapy system without direct communication between selected subsystems, which enhances safety, simplifies quality assurance and quality control, and facilitates programming. For example, the treatment delivery control system directly controls one or more of: an imaging system, a positioning system, an injection system, a radio-frequency quadrupole system, a ring accelerator or synchrotron, an extraction system, a beam line, an irradiation nozzle, a gantry, a display system, a targeting system, and a verification system. Generally, the control system integrates subsystems and / or integrates output of one or more of the above described cancer therapy system elements with inputs of one or more of the above described cancer therapy system elements.

The invention relates to a compact type high-frequency electric focusing hybrid acceleration cavity, and belongs to the technical field of nuclear energy. The compact type high-frequency electric focusing hybrid acceleration cavity is mainly characterized in that in a cavity cylinder, a radio-frequency quadrupole acceleration structure is arranged at the front end of the drift tube acceleration and high-frequency electric quadrupole focusing acceleration structure, a second acceleration gap is formed in the center of the drift tube acceleration and high-frequency electric quadrupole focusing acceleration structure, a first acceleration gap is formed in the center of the radio frequency quadrupole acceleration structure, the first acceleration gap and the second acceleration gap are locatedon the same center line, and the radius of the first acceleration gap is 0-5mm smaller than the radius of the second acceleration gap. The cavity has the advantages that the structure can directly accelerate the direct current beam coming out of the ion source, and due to the compact structure, the length of the cavity can be effectively reduced, the effective acceleration gradient is improved, and the beam quality is excellent.

The invention discloses a combined accelerating structure belonging to the fields of nuclear science and nuclear technology. The combined accelerating structure comprises a radio-frequency quadrupole field part and a separation function radio-frequency quadrupole field part. The radio-frequency quadrupole field part and the separation function radio-frequency quadrupole field are directly connected in the same resonant cavity and center lines of the radio-frequency quadrupole field part and the separation function radio-frequency quadrupole field are coaxial. The radio-frequency quadrupole field part and the separation function radio-frequency quadrupole field adopt the same support mode. The invention not only can save another set of high-powder transmitter and relevant high-frequency control systems so that the total high-frequency power is greatly lower than the summation of the power of two transmitters, but also save matched elements of a high-power electromagnetic lens and the like, so that the overall dimension and the cost of an accelerator can be reduced; in addition, the overall delivery efficiency of beam current can be improved because of avoiding the unbalance of longitudinal and transverse matching of the beam current.

The invention discloses a pulsed magnetic filtering device which comprises a pulsed cathode arc head, an extraction electrode, a focusing straight pipe, a magnetic filtering pipe, a grid mesh and a radio frequency quadrupole filter. By implementing the pulsed magnetic filtering device, ions reaching the surface of a coated workpiece are good in directionality; meanwhile, the charge states of the ions are the same, and thus the pulsed magnetic filtering device is very suitable for refined adjusting and controlling growing of single-crystal films or poly-crystal films; and meanwhile, selective precise plating of the ion films with different valence states can be achieved conveniently by controlling the radio frequency of the quadrupole filter. The pulsed magnetic filtering device has the wide application prospects in preparation of ultrafine and ultra-micro chips or wafer seed crystals.

The invention relates to the novel technical field of manufacturing of a four-vane radio frequency quadrupole field accelerator cavity pi mode rod, in particular to a four-vane radio frequency quadrupole field accelerator cavity pi mode rod hydrogen furnace brazing method. According to the method, brazing parts are positioned during brazing so that the positions of the parts and welding clearance required by brazing can be ensured; after the novel welding method is adopted, welding success rate is increased greatly, machining processes are simplified, assembly is convenient and fast, stability performance is high, the size is small, deformation is slight, the vacuum degree is high, and the vacuum sealing performance of the welded four-vane radio frequency quadrupole field (RFQ) accelerator cavity pi mode rod is improved; a welding clamp is simple in structure, convenient to assemble and high in positioning precision, it is guaranteed that the welding surfaces of pi mode rods are attached to one another, and assembly clearance is smaller than 0.02 mm; enough welding flux is guaranteed, and mobility is improved. In this way, the mobility of molten brazing filler metal is optimal, and then complete welding of the welding surfaces is achieved and the high-vacuum-degree requirement after welding is met.

The present invention provides a device for reducing the radio frequency quality discrimination of radio frequency quadrupoles. Based on the quadrupole transmission principle, radio frequency power supplies of different frequencies and amplitudes have different transmission quality ranges. In order to reduce the quality discrimination, different radio frequency power supplies are respectively applied to the two adjacent electrodes in a segmented quadrupole electrode array, two alternating radio frequency electric fields are generated in the entire transmission axis direction, two segments of quality range mass-to-charge ratio ions are considered at the same time, and the quality discrimination effect is reduced.

The invention discloses a medical radio isotope production system, and the system comprises an RFQ (radio-frequency quadrupole field) accelerator system and a target station device. The RFQ accelerator system is used for generating ions, and speeding up and conveying an ion beam. The target station device is connected with the RFQ accelerator system, and is used for leading the ion beam inwards, employing the ion beam for targeting so as to generate radio isotope and leading the radio isotope outwards. The system can achieve the application of the RFQ accelerator in the field of radio isotope production, is compact in structure, is small in size, is convenient to install, and is low in cost.

The invention discloses a water distribution system of a four-wing radio frequency quadrupole field accelerator cavity. The water distribution system comprises a left water distribution pipeline and aright water distribution pipeline which are arranged on two sides of the accelerator cavity; each of the left water distribution pipeline and the right water distribution pipeline comprises a universal water distribution pipeline and an electrode water distribution pipeline; and each electrode water distribution pipeline comprises an electrode water inlet main pipe, a plurality of electrode waterinlet branch pipes, a plurality of electrode water return branches and an electrode water return main pipe. The water distribution system of the four-wing radio frequency quadrupole field acceleratorcavity disclosed by the invention is provided with the electrode water distribution pipelines which are specially used for cooling electrodes, so that the four electrodes at the two ends of each acceleration section of the accelerator cavity can be cooled, the cooling between different parts in the accelerator cavity is maintained at the same temperature, the temperature and the frequency in theaccelerator cavity are stabilized, and a high-current ion beam which is stable in frequency is obtained by the accelerator cavity.

The invention relates to a mechanical structure of a high-frequency electric focusing ion accelerating device and an assembling method thereof. The mechanical structure comprises a left horizontal single wing, a right horizontal single wing, an upper vertical single wing, a lower vertical single wing, a front end cover and a rear end cover, which form a high-frequency cavity; drift tube assembliesand radio frequency quadrupole field sections are alternately arranged on the central axis of the cavity; and a drift tube supporting rod in the drift tube assembly is fastened on the single wing through a first fastening part. The two ends of the drift tube assembly are tensioned and positioned; meanwhile, the fit clearance between the drift tube assembly and the single wing is slightly relaxedby utilizing the tightness function of the fastening part in the assembly process; over-positioning of the drift tube assembly in the cavity structure is eliminated; the assembly difficulty of the cavity is reduced; and the structural stability and collimation adjustment of the drift tube and the single wing are guaranteed. After the whole cavity is assembled, the coaxiality of the internal drifttube is better than + / -0.10 mm, the field flatness of each gap of the cold measurement drift tube section is better than 1.3%, the field symmetry of each quadrant of the radio frequency quadrupole field section is better than 3%, and the field symmetry is better matched with a theoretical value.

The invention relates to a compact multi-ion accelerator treatment device and application thereof, the compact multi-ion accelerator treatment device comprises an integrated acceleration structure with a radio frequency quadrupole field acceleration characteristic and a positive cross rod drift tube linear acceleration characteristic, and the integrated acceleration structure comprises a radio frequency quadrupole field acceleration part and a positive cross rod drift tube linear acceleration part; the beam output end of the radio frequency quadrupole field acceleration part is connected with the beam input end of the positive cross rod drift tube linear acceleration part, and the two parts are of an integrated cavity structure with the same center line; the positive cross rod drift tube linear acceleration part comprises a first acceleration section, a second acceleration section and a three-combination quadrupole lens positioned between the first acceleration section and the second acceleration section; a plurality of zero-degree phase acceleration gaps are arranged between the beam output end of the radio frequency quadrupole field acceleration part and the longitudinal bunching section in the first acceleration section, and the phase change of the longitudinal bunching section is a gradient phase. According to the treatment device, the overall structural design that the linear accelerator is arranged in the synchrotron is adopted, and the occupied area of the device is greatly reduced.

The invention relates to the technical field of manufacturing technology of core components of a four-wing radio frequency quadrupole field cavity of a linear accelerator, in particular to a high-precision single-wing manufacturing method of a four-wing radio frequency quadrupole field cavity. Use a deep hole drilling machine to drill a water-cooling hole at the bottom of the wing; use tooling for semi-finishing, use an end mill to finish the inner cavity surface of the wing on a vertical machining center, and use a lever type on a horizontal machining center Align the single wing with the dial indicator; use the semi-finishing special forming tool to process the pole head surface of the single wing, and then use the semi-finishing tool to roughly machine the surface of the pole head; use the special tool for finishing machining to process the modulation line of the single-wing pole head, using three coordinates The measuring instrument detects the processing accuracy of the modulation line of the single wing; finally, the surface of all the single wings is pickled. The monoplane produced by this process has high precision and high surface finish. The field frequency measured online after assembly is stable, the field flatness is good, and the field symmetry is good, which is very consistent with the theoretical value.