215results about "Transit-tube collectors" patented technology

The invention relates to a microwave component in the technical field of high power microwave and provides a coaxial-extraction long-pulse relativistic backward-wave oscillator. The coaxial-extraction long-pulse relativistic backward-wave oscillator comprises a cathode base, a cathode, an anode outer cylinder, a cut-off neck, a slow wave structure, a tapered waveguide, an output waveguide, a solenoidal field, a coaxial-extraction structure and a front-arranged reflection cavity. The coaxial-extraction structure is a cylinder. The front-arranged reflection cavity is disposed between the cut-off neck and the slow wave structure. According to the coaxial-extraction long-pulse relativistic backward-wave oscillator, a cylinder is adopted as the coaxial-extraction structure, and therefore the defect that the coaxial-extraction structure with a groove generates plasma is overcome, and meanwhile in the electromagnetic wave mode, function transformation can be carried out and installation can be achieved conveniently. The front-arranged reflection cavity is utilized to replace the cut-off neck so that the resonance characteristic of the front-arranged reflection cavity can be utilized to achieve the effect of the cut-off neck, electron beam scraping or electron beam bombardment of the front-arranged reflection cavity can be avoided, and premodulation of electron beams emitted from the cathode also can be carried out. Therefore, the coaxial-extraction long-pulse relativistic backward-wave oscillator is beneficial for subsequent beam wave interaction and improves power conversion efficiency of the component.

The invention provides an S-waveband 12.1% bandwidth klystron which comprises an electron gun assembly, a cluster segment assembly and an output segment assembly. The electron gun assembly is used for emitting an electron beam which moves forwards along a drift channel under the constraint of a magnetic field; the cluster segment assembly modulates the speed and density of the electron beam emitted by the electron gun assembly to generate a high-frequency electron beam; and the output segment assembly makes beam-wave interaction with the high-frequency electron beam provided by the cluster segment assembly, wherein energy of the electron beam is converted into microwaves in an output cavity, and the microwaves are output. The S-waveband 12.1% bandwidth klystron has unique advantages in the aspects of improving the bandwidth and power.

The invention relates to a four-stage depressed collector for a space traveling-wave tube. A first collector component, a second collector component, a third collector component and a fourth collector component are parallelly arranged inside a circular pipe-shaped collector outer cylinder in sequence in the axial direction, a certain insulating gap is formed between every two collector components, and the electrode lead of each collector passes through an insulating ceramic hole; each collector component comprises a collector electrode, electrode insulating ceramic and an electrode lead; the collector electrode is welded together with the collector outer cylinder through the insulating ceramic; the collector electrode is welded on the inner wall of the electrode insulating ceramic, the outer wall of the electrode insulating ceramic is welded together with the collector outer cylinder, and the electrode lead is directly welded together with the collector electrode and is insulated with other electrode through the insulating ceramic; and the collector outer cylinder is welded and fixed with a collector end cover to form the four-stage depressed collector.

The invention discloses a multi-stage depressed collector material and preparation and a surface treatment method thereof, which relates to a vacuum electronic technology and is a novel microporous electrode material which can be used for a multi-stage depressed collector of a satellite traveling-wave tube and a treatment process thereof. The electrode material has a micron/submicron-level microporous structure and is beneficial to inhibiting secondary electron emission and improving the recovery efficiency of the multi-stage depressed collector, thereby improving the overall efficiency of the traveling-wave tube. The method has the advantages of simple and controllable process and low cost. Compared with the surface modified by ion beams, the electrode surface of the prepared multi-stage depressed collector has the same effect on inhibiting secondary electron emission.

This invention belongs to a multi-level depressurization collector matched with traveling wave tube, comprising a cylindrical shell, each electrode and power source leading wire thereof mounted in the shell, an insulator mounted between each electrode and shell, an insulator rear cover provided with a power source leading hole, a front end cover. Because the original spare-parts type shell and the insulator thereof are designed to the integral cylindrical body with simple structure, the last level electrode is mounted at the central position of the inner wall of the rear cover, and the other each rear end electrodes are provided with the power source leading hole provided with an insulated sleeve for the front end electrode power source leading hole, this invention is featured with simple and compact structure, simple processing and assembling, strong suitability to the insulated material, small size, light weight and wider application range and so on, such that the defaults of complicated shapes the original spare-parts type shell and the insulator thereof has, need of mounting power source leading hole in the insulated layer, bad processing technology, difficult of assembling and bad suitability to the insulated material which are existed in the background technology are conquered.

The invention discloses a 75 kW continuous wave magnetron. The 75 kW continuous wave magnetron comprises a positive pole cavity combination (1), a negative pole lead wire combination (2), a water pipe (3) which is connected with the positive pole cavity (1), an output window combination (4) which is connected with the negative pole cavity combination (1), an antenna combination (5) which is fixed on the negative pole cavity combination (1), and an inner pole shoe (6) which is fixed at one end of the positive pole cavity combination (1), wherein the antenna combination (5) is located inside the output window combination (4). The continuous wave magnetron is reasonable in structural design, high in power, high in output efficiency, less in microwave leakage, and high in safety performance. Particularly, due to the fact that a negative pole structure of a fan-shaped resonator system structure with high characteristic impedance is adopted and an n-shaped water line cooling structure is adopted on a negative pole, heat dissipation effect is better, light striking probability is less, working is stable, structure is novel, and the magnetron is suitable for being used in a high-power microwave heating device in industries.

The invention discloses a 2450-MHz high-power continuous-wave magnetron and a preparation method thereof. The 2450-MHz high-power continuous-wave magnetron comprises an anode cavity combination unit (1), a cathode outgoing line combination unit (2), an output window combination unit (3) connected with the anode cavity combination unit (1), and an output antenna (4) fixed at the anode cavity combination unit (1); the other end of the output antenna (4) is arranged inside the output window combination unit (3); and the anode cavity combination unit (1) is connected with a cavity cooling water inlet-outlet pipe (5). The structure of the provided continuous-wave magnetron is designed reasonably; the power of the magnetron is high and the output power can reach over 30 KW; the service life can reach more than 5000 hours; the microwave leakage is less; and the security performance is high. Besides, according to the preparation method of the continuous-wave magnetron, lots of experiment screening is carried out; and the method has the advantages of reasonable process design and high operability. Moreover, the prepared magnetron with characteristics of high gas tightness, a high vacuum degree, low sparking probability and stable performance enables various defects existing in the prior art to be overcome.

The invention discloses a collecting electrode used for a traveling wave tube and a manufacture method thereof. The collecting electrode used for the traveling wave tube comprises an oxygen-free copper inner core (1), wherein a graphite loading head (2) in a conical structure is nested inside one end of the oxygen-free copper inner core (1) near an collecting electrode opening, the contact part of the oxygen-free copper inner core (1) and the graphite loading head (2) is filled with welding flux (3), in addition, the oxygen-free copper inner core (1) and the graphite loading head (2) are connected in a brazing way, and a ring (4) which is made of ultraperm and used for preventing the pull cracks of the graphite loading head (2) caused by heat expansion of the oxygen-free copper inner core (1) is sheathed on the outer ring of one end of the oxygen-free copper inner core (1) provided with the graphite loading head (2). The oxygen-free copper inner core and the graphite loading head of the collecting electrode used for the traveling wave tube with the structure are connected in the brazing way, so good heat conductive performance of the collecting electrode is ensured, in addition, the front end of the graphite loading head is processed into a conical shape, and the invention is more favorable for the electron absorption.

The invention discloses a high-power millimeter wave and terahertz radiation source device. The high-power millimeter wave and terahertz radiation source device comprises a first low frequency range slow wave structure, a second low frequency range slow wave structure and a high frequency range slow wave structure, wherein a low frequency signal interface and an electron beam interface are formed in one end of the first low frequency range slow wave structure, a signal interface is formed in one end of the second low frequency range slow wave structure, and an output interface is formed in the high frequency range slow wave structure. A first drift tube is arranged between the first low frequency range slow wave structure and the second low frequency range slow wave structure, and a second drift tube is arranged between the second low frequency range slow wave structure and the high frequency range slow wave structure. By the adoption of the high-power millimeter wave and terahertz radiation source device, a stable high-power terahertz radiation source can be obtained. Simultaneously, the high-power millimeter wave and terahertz radiation source device has the advantages of being mature in technique, simple in structure and low in cost.

A collector of an electron tube is formed by using a molybdenum-copper composite material or a tungsten-copper composite material.

The invention provides a porous metal electrode for a multistage depressed collector. The porous metal electrode is prepared by processing the surface of a porous metal material by utilizing a wire electrical discharge machining method, a spark erosion method or an ion bombardment method so as to form pits on the surface of the porous metal material. The porous metal material is made of porous nickel, porous tungsten or porous molybdenum, wherein the porosity is between 20 and 40 percent. The electrode of the multistage depressed collector is manufactured by metal, so a multi-pit surface is formed on the surface of the multistage depressed collector, transmission of secondary electrons is inhibited, and efficiency of the multistage depressed collector is improved.

The invention discloses a relativistic klystron amplifier (RKA) output cavity internally installed with a collector. The external diameter of an output cavity nose cone increases gradually from the input direction to the collector connection point. The inner diameter of the collector increases gradually from the output cavity nose cone connection point to the collector main body. The inner wall of an output cavity outer cylinder between supporting pillars and an output cavity end cover is provided with convex bench, and the three supporting pillars are uniformly distributed on the same circumference cross section in the output cavity outer cylinder. According to the relativistic klystron amplifier output cavity, the output cavity Q value is reduced under the condition of not reducing the angular uniformity of the electric field of the output cavity, thereby reducing the electric field intensity in the output cavity, reducing backflow electrons, reducing adverse impact of the backflow electrons on the working stability of a relativistic klystron amplifier, reducing power density of electron beams attacking the inner surface of the collector, reducing the generation of secondary electrons and other impurities, furthermore, preventing the secondary electrons and other impurities from escaping from the collector, and improving the RKA long pulse repeat frequency operation capability.

The invention relates to a water cooling structure of a microwave oven magnetron, which comprises a circulating water pipe, a water pump and fins, wherein the water pump is connected with the circulating water pipe; part of the water pipe is wound on the outer side of a positive electrode; and part of the outer side of the water pipe is sleeved with the fins. The water pipe is a copper pipe with large thermal coefficients. The fins sleeved on the outer side of the water pipe are made of aluminum alloy, are arranged on the water pipe alternately, and are vertical to the penetrating water pipe.Under the action of the water pump, the water in the water pipe flows circularly, wherein the cold water entering the water pipe on the outer side of the positive electrode absorbs the heat of the positive electrode and is heated into hot water, the hot water flows to the water pipe of which the outer side is sleeved with the fin to radiate into cold water again, the cold water absorbs the heat ofthe positive electrode and is heated again, and is cooled by the fin radiation again, and the water circulates to radiate and cool the magnetron in turn. The fan blows air to the fins to intensify the convection radiating and improve the radiating and cooling effect of the magnetron.

A depressed collector for recovery of spent beam energy from electromagnetic sources emitting sheet or large aspect ration annular electron beams operating aver a broad range of beam voltages and currents. The collector incorporates a trap for capturing and preventing the return of reflected and secondary electrons.

The invention provides a non-axisymmetrical double-inclined-plane multistage depressed collector electrode. In the multistage depressed collector electrode, the inner surfaces of multiple electrodes each comprise a ripple structure composed of a positive inclined plane and a negative inclined plane, the directions of electron inlets of other electrodes apart from a first electrode and a final electrode are each provided with an eccentric hole, and the eccentric holes are deflected to the same direction relative to the electron inlet of the first electrode. Compared to a conventional collector structure, the non-axisymmetrical double-inclined-plane multistage depressed collector electrode has the advantages of being capable of inhibiting secondary electron backflow, improving the collector efficiency and reducing the backflow rate.

The invention discloses a travelling wave tube collector assembly and an assembly process thereof. The travelling wave tube collector assembly comprises a collector inner core and a collector sleeve, the collector inner core is arranged in the collector sleeve, and an insulating ceramic is arranged between the collector inner core and the collector sleeve; the insulating ceramic is made of a molybdenum copper material; and the assembly technology of the travelling wave collector assembly finishes welding process among the insulating ceramic, the travelling wave tube inner core and the travelling wave tube sleeve by using palladium-based brazing filler metal and a way of increasing the height of a solder groove. According to the travelling wave tube collector assembly and the assembly process thereof disclosed by the invention, the assembly quality of the travelling wave tube collector assembly can be ensured and further the product performance of the travelling wave tube can be guaranteed.

The invention relates to a multi-stage depressed collector with a lining grid, which is designed based on the principle that a metal grid is embedded in the inner surface of the multi-stage depressed collector in order to suppress the emission of secondary electrons, wherein the metal grid is made of nickel, molybdenum, tungsten, oxygen-free copper or stainless steel and is 0.1-0.3 mm in thickness, and the mesh density ranges from 50 to 200 meshes. The manufacturing method of the collector comprises the step of punching or curling a plane metal grid. In the invention, the emission of secondary electrons is suppressed and the efficiency of the multi-stage depressed collector is improved by using a method of embedding the metal grid in the inner surface of the electrode of the multi-stage depressed collector.

The invention provides an outer cylinder side opening type multistage depressed collector component and a manufacturing method thereof. The multistage depressed collector module is formed by using a non-welding fabrication technology. In the module, a whole beryllia ceramic cylinder is divided into 1/N arcs according to the stage number N of a collector, and the arcs are combined to form a complete cylinder; grooves are formed on the beryllia ceramic cylinder to position each electrode, and each lead wire of the collector passes through a hole respectively formed in the ceramic arcs; an opening is obliquely formed on the side edge of the outer cylinder of the collector, after the ceramic arcs and each electrode of the collector are filled in the outer cylinder, a welding flux is placed atthe opening, a molybdenum cylinder is sleeved outside the outer cylinder; and the whole body is heated in a furnace, the molybdenum cylinder with a low expansion coefficient ensures that the collector outer cylinder, insulating ceramics and electrodes are tightly compacted together, and then welding and sealing are carried out, thus the collector component is manufactured. The welding flux is notfilled inside the collector, when the collector works, the welding flux is prevented from evaporating and polluting the ceramics even the temperatures rises higher, so the insulating capability cannot be reduced, and the stability and service life of the product are ensured. The collector component is used in S-band high power impulse space traveling wave tubes.

The invention discloses a compact relativistic magnetron of an axial output structure, and belongs to the technical field of high-power microwaves. The structure comprises a ten-resonant-cavity rising-sun-shaped relativistic magnetron, a coupling structure serving as a transition structure and a ridged circular waveguide output structure. The problem that high-order mode electromagnetic waves aredifficult to use efficiently in the magnetron axial diffraction output scheme is solved, the output energy is directly and efficiently extracted from the rising-sun-shaped relativistic magnetron in aTE51 mode by using a ridged circular waveguide structure, and the efficiency can reach 70%. Meanwhile, the total volume occupation of the whole system is remarkably reduced, and by taking an L-band working state as an example, the radius of the circular waveguide is reduced to 130mm from 250mm in the existing scheme, and the axial full length is reduced to 490mm from 866mm.

A klystron tube for amplifying signals at microwave radio frequencies utilizes an electron source for emitting electrons through a field focused by a high energy magnet in the RF section of the tube. After the electrons have passed through the active area of the tube, the electrons strike the collector which, in this case, is a multistage depressed collector. The multistages of the depressed collector are connected to high energy voltage sources of different potentials. The klystron tube with the multistage depressed collector is uniquely used here for the first time in a ground based satellite or terrestrial communications system.

A collector of a traveling wave tube in which a larger quantity of loss ceramic members are arranged between an outer collector enclosure and an outer surface of a collector electrode for increasing high frequency loss to prevent RF leakage from the collector lead wire. The collector includes a collector electrode 2, heat conductive columnar ceramic elements 3, an outer collector enclosure 4 for maintaining vacuum and loss ceramic members 5 arranged between the outer surface of the collector electrode 2 and the inner surface of the outer collector enclosure 4.

The invention discloses a method for processing the surface of a Cu electrode of a multistage depressed collector through graphene, relates to the technology of vacuum electronics, and provides a novel collector processing technology applicable to a high-efficiency travelling-wave tube. According to the method, a grapheme coating is adopted and can be directly used for processing the oxygen-free copper electrode, secondary electron emission is restrained, the recovery efficiency of the multistage depressed collector is improved, and the overall efficiency of the travelling-wave tube is improved. The method is simple in process, controllable in technology and low in cost, and the processed multistage depressed collector can achieve the same secondary electron emission restraining effect as a collector made of graphite. The processed multistage depressed collector has the advantages of a traditional graphite collector, has higher mechanical performance, electric conduction performance and heat conduction performance, and solves the problems that the structure is loose, strength is low and the graphite collector is prone to generating graphite dust under a long-term bombardment of electron beams, thereby effectively improving the efficiency and reliability of the travelling-wave tube.

A collector in a microwave tube has a collector electrode for capturing an electron beam radiated from an electron gun and passing through a slow wave circuit, an insulator disposed in contact with the outer peripheral surface of the collector electrode, and a radiator disposed in contact with the outer peripheral surface of the insulator, wherein the insulator, the outer diameter of the collector electrode, and the inner diameter of the radiator are tapered in the axial direction of the tube.