53 results about "Radio-frequency quadrupole" patented technology

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.

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.

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 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.

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 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 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 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.