74 results about "Drift tube" patented technology

The invention provides a method for measuring gamma-aminobutyric acid in tableted candies, which comprises the following steps: measuring gamma-aminobutyric acid in tableted candies by using HPLC-ELSD (High Performance Liquid Chromatography-Evaporative Light Scattering Detector) according to a volume ratio of acetonitrile to water of (50-70): (30-50) as a mobile phase; a chromatographic column is an amino column; a detector is ELSD, the temperature of a drift tube is 80-85 DEG C, and carrier gas is air. The detection method disclosed by the invention is strong in specificity, high in accuracy, strong in stability, good in repeatability and high in sensitivity, and compared with an existing derivation method, the method disclosed by the invention is simple, green and efficient, and can be used for effectively detecting the content of gamma-aminobutyric acid in the tabletted candies.

A linear accelerator apparatus may include a beamline enclosure that defines a polygonal backbone, and a plurality of acceleration stages, disposed along a length of the beamline enclosure. A given acceleration stage may include a drift tube assembly to conduct an ion beam therethrough, a resonator, coupled to deliver an RF signal to the drift tube assembly, and a quadrupole assembly to shape the ion beam. As such, at a first acceleration stage, a first resonator may be disposed along a first side of the polygonal backbone, and at a second acceleration stage, adjacent to and downstream of the first acceleration stage, a second resonator may be disposed along a second side of the polygonal backbone, different from the first side.

An ion implantation system including an ion source for generating an ion beam, an end station for holding a substrate to be implanted by the ion beam, and a linear accelerator disposed between the ion source and the end station and adapted to accelerate the ion beam, the linear accelerator comprising at least one acceleration stage including a resonator coil coupled to a drift tube assembly, the drift tube assembly including a first drift tube coupled to a first end of a first insulting rod via interference fit, a second drift tube coupled to a first end of a second insulting rod via interference fit, and a mounting bracket coupled to a second end of the first insulting rod and to a second end of the second insulting rod via interference fit.

The invention discloses an ultrahigh-spatial-resolution time-broadening framing camera and a framing imaging method, and solves the problem that the spatial resolution of a system is reduced due to spatial dispersion caused by the space charge effect of electrons in the transition process of an existing time-broadening framing camera. According to the invention, the characteristic that the spinning period of the photoelectrons moving in a drift magnetic field is only related to the magnetic field intensity and is irrelevant to the speed distribution of the photoelectrons overflowing from the microstrip line structure is utilized, that is, the photoelectrons overflowing from the microstrip line structure drift for a fixed time; the phase of the photoelectron circular motion is consistent with the initial phase of the photoelectron when the photoelectron overflows from the microstrip line structure, that is, by designing the magnetic field intensity and the microstrip line structure voltage, it is ensured that the photoelectron advancing in a spinning mode reaches the traveling wave gating framing tube after the integer period circular motion in the magnetic drift tube; that is, the circumferential phase of the electrons reaching the traveling wave gating framing tube is the same as the phase when the photoelectrons overflow, so that the spatial resolution of the camera reaches the optimal system.

The utility model provides a kind of proton acceleration system, neutron generating device and isotope generating device.The proton acceleration system includes radio frequency quadrupole acceleration module, at least has radio frequency quadrupole accelerator;Drift tube linear accelerator module, at least has drift tube linear accelerator.Based on the above-mentioned proton acceleration system, first by radio frequency quadrupole acceleration module to proton beam is accelerated to handle, so that the energy of proton beam reaches first energy value;Further energy adjustment processing is carried out to the proton beam of first energy value by drift tube linear accelerator module, so that the energy of proton beam reaches the second energy value that meets requirements.

A linear accelerator apparatus suitable for radiotherapy applications such as FLASH radiotherapy, comprising an apparatus for accelerating a beam of electrons 412 provided by an injector 410 through t

The invention provides a lateral coupling drift tube linear accelerator based on a modular drift tube structure, and the linear accelerator comprises a main acceleration cavity chain which is formed by sequentially arranging a plurality of acceleration cavities in a straight line, each acceleration cavity is internally provided with a plurality of drift tubes, and the structures and sizes of the plurality of drift tubes arranged in a single acceleration cavity are the same; the gaps among the plurality of drift tubes arranged in the single acceleration cavity are equal; the adjacent accelerating cavities are communicated through beam hole channels along the central axis of the main accelerating cavity chain; the permanent magnet type quadrupole lenses are arranged on the beam hole channels; and the side coupling cavities are formed in the off-axis positions between every two adjacent acceleration cavities, and the side coupling cavities are connected with the adjacent acceleration cavities through the coupling holes. The accelerator adopts a phase matching thought, so that the lengths of all the acceleration units in the same acceleration cavity and the structural sizes of the drift tubes are completely the same, the modular production and array installation of the drift tube structure are realized, and the manufacturing and testing work of the SCDTL is greatly simplified.

The invention provides a drift tube linear accelerator on-line frequency compensation method, which comprises the following steps: firstly, constructing an initial cavity three-dimensional simulation model, judging the flatness of an axial field through calculation, and adjusting the angle of an eccentric sheet if the flatness does not reach the standard; calculating the stability of the electric field, and adjusting the length of the coupling rod if the electric field does not reach the standard; the field flatness is judged again after stability tuning, and the angle of the eccentric piece is adjusted if the field flatness does not reach the standard; a tuning block is added according to an opening of the cavity, wherein the tuning block comprises a new pickup port tuner, and a vacuum pump mesh, a fixed tuner and a rod coupler are improved; after a tuning block is added, frequency, axial field flatness and stability calculation is carried out, if the three indexes all meet requirements, compensation is ended, and otherwise, it is considered that compensation cannot be carried out; according to the method, a frequency compensation scheme can be simulated and determined, so that the field flatness and stability meet the operation requirements, and a cold test system is prevented from being rebuilt in a tunnel for field adjustment.

The application provides a balance block anti-drifting management device, and relates to the field of lithography technology of semiconductors. The device is designed to solve the problem that the existing balance block anti-drifting management device cannot meet the anti-drifting control of large thrust or large torque. The device is arranged between a bottom frame and a balance block, and comprises a plurality of X-direction anti-drifting elements and a plurality of Y-direction anti-drifting elements. The X-direction anti-drifting elements are installed on the bottom frame and used to provide an acting force along the X direction for the balance block. The plurality of X-direction anti-drifting elements are arranged in a scattered manner along a first direction. The Y-direction anti-drifting elements are installed on the bottom frame and used to provide an acting force along the Y direction for the balance block. The plurality of Y-direction anti-drifting elements are arranged in a scattered manner along a second direction. The second direction is arranged at an angle with the first direction. The application can realize the anti-drifting control of large thrust and large torque for the balance block.

The invention discloses a corona discharge ion mobility spectrometer, which relates to the technical field of analytical chemistry instruments and comprises a corona discharge assembly, a reverse field ion gate structure, an ion migration assembly, a sample gas inlet, a shielding grid mesh and a Faraday detection plate. The corona discharge assembly comprises a corona discharge needle and at least three ion reaction area electrode rings which are sequentially distributed at intervals. The reverse field ion gate structure comprises a first grid mesh, a second grid mesh and a third grid mesh which are distributed at intervals in the axial direction and can be connected with different voltages, and the reaction area is located between the first grid mesh and the second grid mesh. The ion migration assembly comprises a plurality of ion migration region electrode rings which are coaxially arranged. The electric field is improved through the arrangement of the grid meshes, the area between the first grid mesh and the second grid mesh of the reverse field ion gate serves as the reaction area, the original reaction area is removed, miniaturization of the drift tube is facilitated, and meanwhile the sensitivity and the resolution ratio under a complex matrix are improved.

A drift tube construction includes a thin wall aluminum tube with a thin wire at its center attached to a terminal. The tube is plugged at both ends. The terminal is embedded at the center of the plug with material insulating it from Drift tube main body. The Drift tube assembly is sealed and filled with a gas mixture. A voltage is applied to the thin wire via the terminal. Current drift tubes employ plastic material to insulate the terminal from Drift tube main body and O-rings to provide a near hermetic seal.

The invention provides a linear injector system and a beam control method, and the system comprises a radio frequency quadrupole accelerator which comprises a first bunching segment disposed at the tail end of the radio frequency quadrupole accelerator, and the first bunching segment is used for carrying out the initial phase width compression of a beam; the at least one interdigital drift tube linear accelerator comprises at least one KONUS period, and each KONUS period sequentially comprises a second bunching section used for compressing the phase width of the beam from the upstream to obtain the beam subjected to phase width compression from the input end to the output end; the acceleration section is used for accelerating the beam current after the phase width compression at a constant synchronous phase to obtain an accelerated beam current; and the focusing section is used for focusing the accelerated beam on a plane perpendicular to the transmission direction to obtain a focused beam.

The application discloses an electrospray detector, which comprises a first air inlet pipe, a second air inlet pipe, a discharge chamber, an atomization chamber, a drift tube, a mixing chamber, a waste liquid pipe, a waste liquid bottle, a migration pipe, a particle removal trap and a collection device. The air inlet of the second air inlet pipe is communicated with the pipe body of the first air inlet pipe; the discharge chamber is communicated with the second air inlet pipe; the atomization chamber is communicated with the first air inlet pipe; the drift tube is formed in a straight cylinder shape; the drift tube is communicated with the atomization chamber; the mixing chamber is communicated with the drift tube and the discharge chamber; the waste liquid pipe is communicated with the mixing chamber; the liquid outlet of the waste liquid pipe is communicated with the waste liquid bottle; the migration pipe is communicated with the mixing chamber; the migration pipe is formed in a straight cylinder shape; the migration pipe and the drift tube are located on the same axis; the particle removal trap is arranged in the migration pipe; and the collection device is communicated with the migration pipe. The drift tube and the migration pipe of the electrospray detector are both in a straight cylinder shape, so that the sample does not collide with the pipe wall, the loss of the sample is avoided, the detection precision is improved, and the pollution to the pipe wall is reduced.

This invention relates to a method for detecting defoamer 204, belonging to the field of bioproduct quality testing. This invention employs HPLC-ELSD to detect defoamer 204, providing a solution for determining the content of defoamer 204 in bioproducts by optimizing sample pretreatment conditions, HPLC parameters (mobile phase selection, elution gradient), and ELSD parameters (carrier gas flow rate, drift tube temperature, detector gain). Furthermore, this invention exhibits a wide linear range (R04 at 2.5~50 μg / mL) when used for defoamer 204 detection. 2 With advantages such as >0.99, high accuracy (recovery rate of 91.4~98.5%), high sensitivity (limit of detection of 1.0 μg / mL, limit of quantitation of 2.5 μg / mL), good specificity, and simple operation, it can accurately detect the presence and content of defoamer 204 in biological products, filling a gap in the field and having great significance for the quality monitoring and control of biological products.

A linear accelerator apparatus may include a beamline enclosure that defines a polygonal backbone, and a plurality of acceleration stages, disposed along a length of the beamline enclosure. A given acceleration stage may include a drift tube assembly to conduct an ion beam therethrough, a resonator, coupled to deliver an RF signal to the drift tube assembly, and a quadrupole assembly to shape the ion beam,. As such, at a first acceleration stage, a first resonator may be disposed along a first side of the polygonal backbone, and at a second acceleration stage, adjacent to and downstream of the first acceleration stage, a second resonator may be disposed along a second side of the polygonal backbone, different from the first side.

The invention discloses a preparation method of a small pulse broadening drift tube for ultrafast diagnosis and the pulse broadening drift tube thereof. The method comprises the following steps: 1) brazing a front shell and a rear shell, and carrying out indium filling, indium melting and indium turning operation on the front shell; 2) performing spot welding to obtain a first grid mesh assembly, a second grid mesh assembly and a third grid mesh assembly; 3) preparing a substrate, a conductive film layer and a sealing film layer, and assembling to obtain a cathode input window; (4) sealing the metal anode flange, the frit ring and the optical fiber panel at high temperature, and plating a metal layer on the small surface of the optical fiber panel to prepare an anode assembly; (5) the first grid mesh assembly and the second grid mesh assembly are assembled on the front shell to obtain the front shell provided with the front assembly; and 6) preparing a cathode input window and a cathode at the rear end, degassing at high temperature, electronically brushing and sealing indium at high vacuum degree to obtain the small pulse broadening drift tube which can meet the requirements of the technical fields of nuclear detection, high-energy physics and the like on ultrafast diagnosis equipment.

The invention discloses a cathode-grid voltage calibration method for a time-broadening framing camera, and solves the problem that time resolution of the time-broadening framing camera cannot be determined along different positions of a cathode microstrip due to the lack of a cathode-grid voltage calibration method for the time-broadening framing camera adopting a transmission-type cathode. The calibration method is used for calibrating the cathode-grid voltage of the time-broadening framing camera adopting a transmission-type cathode, when pulsed light reaches the transmission-type cathode, part of light penetrates through the transmission-type cathode and directly reaches the cathode surface of a rear-end traveling wave gating framing tube to generate light current, part of light signals generate a photoelectric effect at the transmission-type cathode, and the cathode-grid voltage of the time-broadening framing camera is calibrated. Photoelectrons drifting in the magnetic drift tube are generated, and reach the cathode surface of the rear-end traveling wave gating framing tube after drifting in the magnetic field; the time difference of the cathode surface of the traveling wave gating framing tube at the rear end of the camera is broadened by using the arrival time of drifting photoelectrons and transmission light, and the microstrip voltage distribution characteristics of the cathode of the camera are obtained.

The invention relates to a V-band high-power microwave oscillator based on distributed extraction, a solenoid magnetic field is electrified to generate a magnetic field, under the guidance of the magnetic field, an electron beam is transmitted into a drift tube, and is transmitted to two sections of V-band slow wave structure areas of an internal coaxial electromagnetic structure along the axial direction; in the area of the first section of slow wave structure, the beam and the wave are synchronized to enable the beam to generate speed modulation, the speed modulation obtained by the beam in the first section of slow wave structure is converted into density modulation in the drift cavity through drift motion, finally, the electron beam and the coaxial slow wave structure generate beam-wave action in the second section of slow wave structure, energy is given to a microwave field, and therefore HPM is generated. The second coaxial microwave output waveguide is communicated and coupled with the seventh slow-wave structure period and the twelfth slow-wave structure period of the second section of slow-wave structure, so that a part of energy given to microwaves by electron beams is output from the second coaxial microwave output waveguide, and the distributed extraction effect is achieved; and the power capacity of the device is effectively improved.

The invention discloses an IH-RFQ composition board mounting structure and a mounting method thereof, and the IH-RFQ composition board mounting structure comprises a frame, an accommodating space is formed in the frame, and the frame is fixedly provided with at least one adjustable supporting assembly; the plurality of connecting block groups are sequentially arranged along the length direction of the accommodating space; each square drift tube is fixedly connected with the frame through a positioning column, and the square drift tubes are detachably connected with the electrode assembly. The square drift tubes are connected to the electrode piece, the connecting blocks with different precisions are arranged to be assembled with the electrode piece, and the electrode piece is preliminarily positioned and re-positioned in cooperation with the adjustable supporting assembly, so that the assembly precision of the electrode piece is improved, and the structural stability of the RFQ accelerator cavity after welding is guaranteed.

The invention relates to the field of microwave vacuum electronic amplification devices, and particularly provides a double-staggered coupled cavity expansion interaction klystron with a trapezoidal sub-wavelength hole high-frequency structure, which comprises an input cavity, a plurality of middle cavities, an output cavity, a rectangular electron beam channel and a drift tube, and is characterized in that the input cavity, the plurality of middle cavities and the output cavity are sequentially connected through the drift tube; the input cavity, the middle cavity and the output cavity all adopt a double-staggered coupled cavity structure; on the basis, in the input cavity, the middle cavity and the output cavity, the resonant cavities are connected with the upper coupling cavity and the lower coupling cavity through the isosceles trapezoid sub-wavelength holes, and the long bottom edges of the isosceles trapezoid sub-wavelength holes and the wide edges of the resonant cavities are arranged in equal proportion, so that the electric field energy is more gathered in an electron beam channel, the characteristic impedance is increased, and the interaction efficiency is improved; meanwhile, the quality factor is reduced, and parasitic oscillation is avoided. Compared with an existing structure, the expansion interaction klystron has obvious advantages in the aspects of high power, high gain, high efficiency and wide bandwidth.

An ion implanter is provided, including an ion source and extraction system, arranged to generate a continuous ion beam at a first ion energy, and a linear accelerator, arranged to generate a bunched ion beam from the continuous ion beam, and to accelerate the bunched ion beam to a second ion energy, greater than the first ion energy. As such, the linear accelerator may include a plurality of acceleration stages, where a given acceleration stage of the linear accelerator includes a drift tube assembly, arranged to accelerate the bunched ion beam through a plurality of acceleration gaps. The given acceleration stage may also include a resonator, arranged to deliver an RF voltage signal to the drift tube assembly, and a resonance control circuit, having a variable capacitor that is arranged to adjust a resonator capacitance of the resonator, in order to maintain a resonant frequency of the resonator circuit.

The invention provides a drift tube linear accelerator, and relates to the field of linear accelerators. The drift tube linear accelerator comprises a cavity structure, wherein the cavity structure comprises a ridge structure; the drift tube is connected with the ridge structure; and the water path assembly penetrates through the ridge structure and is connected with the drift tube, and the water path assembly is used for cooling the drift tube. According to the method, the water path assembly is communicated with the drift tube, and the drift tube can be cooled in the water cooling process, so that the thermal stability of the drift tube linear accelerator is remarkably improved, and the problem that the drift tube is prone to thermal deformation to affect stable operation of the drift tube linear accelerator can be solved.

The utility model provides a drift tube structure which comprises a drift tube and two supporting rods symmetrically arranged on the outer surface of the drift tube. A first cooling pipeline for a cooling medium to flow is arranged on the pipe wall of the drift pipe, and the first cooling pipeline is of a closed annular structure arranged in the circumferential direction of the drift pipe; a second cooling pipeline communicated with the first cooling pipeline is arranged in the supporting rod, and the second cooling pipeline extends to the free end of the supporting rod along the supporting rod; one of the two second cooling pipelines is a liquid inlet pipeline, and the other second cooling pipeline is a liquid outlet pipeline; a flow guide part is arranged at the communication part of the first cooling pipeline and the liquid inlet pipeline, and is positioned on the inner wall of the first cooling pipeline; according to the drift tube structure, by arranging the flow guide part, the cooling medium at the liquid inlet of the first cooling pipeline is divided and guided, so that the problem of non-uniform flow velocity caused by backflow of the cooling medium is inhibited or eliminated, and the cooling effect of the drift tube structure is improved.

The invention relates to a compact proton linear accelerator compatible with conventional radiotherapy and flash therapy, and the accelerator comprises an ion source which generates a proton beam; the radio frequency quadrupole field accelerator comprises a first radio frequency quadrupole field accelerator and a second radio frequency quadrupole field accelerator, and the first radio frequency quadrupole field accelerator and the second radio frequency quadrupole field accelerator are spliced in a vacuum sealing mode through a flange; the side-coupled drift tube linear accelerator and the coupled cavity linear accelerator are sequentially arranged behind the radio frequency quadrupole field accelerator, and the ion source, the radio frequency quadrupole field accelerator, the side-coupled drift tube linear accelerator and the coupled cavity linear accelerator form a full-linear structure. The device has remarkable advantages in the aspects of treatment capacity, occupied area, construction scale and the like, and is more beneficial to popularization and application in a hospital environment.

Chemical trace detection system 300 comprises ioniser 320, drift tube 310 and detector 330. In desorber 350, sample holder 351 holds a sample in or adjacent to ionisation region 321, which is adjacent

The application discloses a K-band transit-time oscillator based on a last pre-cavity extraction structure, which comprises an inner cylinder and an anode outer cylinder sleeved outside the inner cylinder, a circular annular cavity is formed between the inner cylinder and the anode outer cylinder, the cavity comprises a first drift tube, a first modulation cavity, a second drift tube, a second modulation cavity, a third drift tube, an extraction cavity and a first coaxial output waveguide which are sequentially communicated, the output end of the anode outer cylinder is further provided with a circular annular second coaxial output waveguide, the first coaxial output waveguide and the second coaxial output waveguide are coaxially arranged, the second modulation cavity is further communicated with the second coaxial output waveguide, and the K-band transit-time oscillator is rotationally symmetrical about the central axis of the inner cylinder. The application verifies the feasibility of extracting microwave by the last pre-cavity, and realizes higher efficient output and higher power output.

An ion implanter is provided, including an ion source and extraction system, arranged to generate a continuous ion beam at a first ion energy, and a linear accelerator, arranged to generate a bunched ion beam from the continuous ion beam, and to accelerate the bunched ion beam to a second ion energy, greater than the first ion energy. As such, the linear accelerator may include a plurality of acceleration stages, where a given acceleration stage of the linear accelerator includes a drift tube assembly, arranged to accelerate the bunched ion beam through a plurality of acceleration gaps. The given acceleration stage may also include a resonator, arranged to deliver an RF voltage signal to the drift tube assembly, and a resonance control circuit, having a variable capacitor that is arranged to adjust a resonator capacitance of the resonator, in order to maintain a resonant frequency of the resonator circuit.

The utility model relates to gas monitoring technical field discloses a kind of filtering connection structure based on EPTFE semi-permeable membrane, including air cock unit, pagoda connection unit;Air cock unit includes air cock pedestal, air cock tube connected with body monitor is equipped in air cock pedestal one side, air cock pedestal other side is equipped with external thread interface A;Pagoda connection unit includes pagoda joint body, pagoda joint body one side is equipped with internal thread interface, pagoda joint body other side is equipped with pagoda joint;Pagoda connection unit is placed after EPTFE filter element in internal thread interface, and sealing connection is realized by screwing into the external thread interface A of air cock unit.The utility model uses EPTFE semi-permeable membrane to replace ordinary PVDF filter membrane as the filtering connection structure of monitor sampling, effectively blocks moisture and particulate matter into drift tube, provides clean and stable detection environment in drift tube, while enhancing the anti-interference ability of monitor in complex environment, improve resolving power, prolong the service life of filter element.

The present application relates to the technical field of ion accelerator, in particular to a drift tube type linear accelerator. The linear accelerator comprises: a cavity cylinder, which is a shell structure with a cavity inside; a drift tube, which is a square tube with open slots at both ends; a first cross beam and a second cross beam arranged in the cavity; wherein a plurality of drift tubes are arranged along the central axis of the cavity cylinder at intervals, the first cross beam and the second cross beam are both provided with support rods, the support rods on the first cross beam and the second cross beam are arranged alternately and connected with the drift tubes one by one; the first cross beam is connected with a positive electrode, and the second cross beam is connected with a negative electrode, for establishing a radio frequency electric field between adjacent drift tubes. In the present application, the drift tube is arranged as a square tube with open slots at both ends and mixed arrangement, so that the linear accelerator can not only keep a high acceleration gradient in the longitudinal direction, but also have a strong focusing force in the transverse direction.