368results about "Transit-tube cathodes" patented technology

The invention relates to a preparation method for an oxygen-free copper tube for a magnetron. The preparation method is characterized in that the contents of copper and silver in a material of the oxygen-free copper tube is larger than or equal to 99.97%, and oxygen content is smaller than or equal to 0.001%. The preparation method includes following process steps: 1, smelting: placing number 1 high-purity cathode copper in a power frequency induction furnace with a core, raising the temperature of the furnace to smelt the cathode copper into copper liquid, adding lanthanum with the mass fraction ranging from 0.01% to 0.016% into the copper liquid, keeping the copper liquid at the temperature of 1170 +/-10 DEG , and covering a charcoal layer with the thickness ranging from 100mm to 120mm and the charcoal granularity ranging from 40mm to 60mm on the surface of the copper liquid; 2, upward continuous casting; 3, precise cold rolling; 4, recrystallization; 5, cold drawing forming; and 6,finishing. The oxygen content is low, electric conduction is excellent, yield is high, and metal loss is low.

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, which belongs to the maser field, directly relates to a relativistic backward wave oscillator for generating a linearly polarized TE11 mode directly. The relativistic backward wave oscillator comprises an arc cathode, a reflector, an angular partition slow wave structure, an output waveguide and a magnetic field coil. The arc cathode is arranged at the front end of the relativistic backward wave oscillator; the reflector, the angular partition slow wave structure, and the output waveguide are arranged at the rear side of the arc cathode successively; and the magnetic field coil is installed at the periphery. According to the invention, with the nonaxisymmetrical arc cathode and the angular partition slow wave structure, the TE11 mode is excited directly. The reflector employs the dual-premodulation-cavity unit preferably and is used for carrying out premodulation on an arc relativistic electron beam and leaking the part of TE11 mode to enter the arc cathode zone, so that certain premodulation of the electron beam at the arc cathode zone is realized and thus the beam wave conversion efficiency is improved. Moreover, the oscillator has advantages of simple structure and high conversion efficiency; and the linearly polarized TE11 mode can be generated directly.

The invention relates to a light and small type permanent magnetic packaging Ku waveband coaxial transition device. The cathode A of a focusing cathode E is loaded; explosion electronic emission occurs under the condition of externally added high voltage; after electronic beams pass cascading double resonance reflection cavities, initial speed pre-modulation is acquired; speed modulation is completely converted into density modulation; high-frequency electric fields in the cavities are extracted and sufficient interactions occur between the high-frequency electric fields and clustering electronics transmitted therein; generated Ku waveband HPM is externally coupled and output through coaxial output waves; and finally, coaxial grooves in an inner conductor B absorb electronic beams of restenergy. The intensity of the generated electric fields is 0.3T, the weight of the permanent magnet is 63.5kg; and under the guidance magnetic field, effective emission and transmission of the electronic beams are achieved. By introducing the cascading double resonance reflection cavities, coupling of the electromagnetic fields in the modulation cavities to diode regions is reduced, radial fluctuation of the electronic beams is reduced and the required guidance magnetic field is reduced. The working mode of the device is TM02, so the novel device is allowed to have quite high power cavity in the Ku waveband.

A high-efficiency electron-emitting device that can emit electron with higher luminance at a voltage lower than conventional electron-emitting devices, as a key device of a flat panel display, image pickup device, electron beam device, microwave traveling-wave tube is provided to improve the carrier injection efficiency and enhance luminance of an organic light-emitting device. A film having space charge with a thickness of 50 nm or less is formed on a surface of a conductive material on which irregularities, amorphous or fibrous materials are formed. The film includes compounds of group 3 atoms such as aluminum nitride, boron nitride, aluminum nitride boron, aluminum nitride gallium, boron nitride gallium and nitrogen atoms, and nitride, carbon, silicon, oxygen and boron such as oxides including nitrogen boron carbon, boron carbide, carbon nitride, boron.

The invention discloses a dip-coated barium-tungsten cathode for traveling-wave tubes and a preparation method thereof. The dip-coated barium-tungsten cathode comprises a cathode drum, a cathode spongy body positioned inside the cathode drum. The invention is characterized in that the cathode spongy body is laminated by a tungsten spongy body and a tungsten-rhenium spongy body, wherein the tungsten-rhenium spongy body is coated with a noble metal film on the surface. With the above structure and preparation method, compared with the prior art, the cathode spongy body is a two-layered cathode spongy body laminated by the tungsten spongy body and the tungsten-rhenium spongy body, to replace the single-layer alloy substrate with uniform porosity in the prior art; the consumption of the noble metal Re is reduced; the porosity of the tungsten spongy body is increased; the storage level of cathode salts is increased; and the preferable proportion of the cathode salts allows both the emission behavior and the stability of salts better. With the noble metal Re coating, the cost of target materials is reduced. The consumption of noble metal is greatly reduced while ensuring the maximal emission and long service life of alloy substrate film-coated cathodes. The storage quantity of cathode salts is increased and the service life of cathode is prolonged.

A magnetron comprising an anode portion having an anode cylinder and vanes, a cathode portion having a coil-shaped filament, magnetic poles disposed at the upper and lower ends of the filament, ring-shaped permanent magnets made of a Sr ferrite magnet containing La—Co, an input portion and an output portion. The diameter φa of the inscribed circle at the ends of the vanes constituting the anode portion is in the range of 7.5 to 8.5 mm, and the outside diameter φc of the coil-shaped filament 1 constituting the cathode portion is in the range of 3.4 to 3.6 mm.

This disclosure describes a multibeam doubly convergent electron gun. Two or more beamlets can be run parallel to the axis at a prescribed radius to produce sufficient current to drive the VED. In order to obtain sufficient cathode surface area to provide the required current, the beamlets are launched from a cathode radius greater than the radius required in a slow wave circuit. In one embodiment, an electron gun includes a focus electrode that surrounds two or more cathodes, wherein each cathode emits a beamlet comprised of a plurality of electrons directed to a predetermined location. A first anode receives each beamlet at the predetermined location, accelerates each beamlet and changes the radius of each beamlet. A second anode receives each beamlet from the first anode, directs each beamlet along a predetermined axis, further accelerates, and can further compress each beamlet.

A high-power relativistic magnetron wherein the cathode geometry is shaped to form a DC electric field that has a non-negligible azimuthal component causing preferential selection of the pi mode at startup (suppression of mode competition), a significant increase in radiated power output and time integrated efficiency when compared to standard relativistic magnetron cathode designs.

A microscale vacuum electronic device (10) provides for a mechanical modulation of cathode (12) position allowing improved high-frequency modulation of an electron beam (24) useful for vacuum electronic devices such as klystrons, klystrodes, and high frequency triodes.

The invention belongs to an oval sheet beam electron gun, which is used with a travelling wave tube, a backward wave tube and the like. The oval sheet beam electron gun comprises a shell, an electric heating wire in the shell, a cathode component, a focusing electrode component and an anode, wherein an emitting surface of a cathode head of the cathode component is a plane, the focusing electrode component comprises a pyramidal focusing hole, and the anode is positioned at an output port of the shell and provided with an anode hole which is a cylindroid hole. The cathode head is made of lanthanum hexaboride, the emitting surface of the cathode head is modified into a plane, a pyramidal hole with a rectangular axial section is used as the focusing hole, and the cylindroid hole is used as the anode hole, so that the oval sheet beam electron gun has the advantages that the oval sheet beam electron gun is simple in structure and convenient in processing, the precision is easy to be guaranteed, devices are easy to be miniaturized, the production cost is low, current emitted by the cathode head is high in density, operation frequency of the devices and current density of electron beams can be improved effectively, the electron gun is high in output efficiency and long in service life, and the like. The defects of complex structure, low current density and unevenness of the electron beams, high evaporativity and short service life of the cathode in operation at high temperature, and the like in the prior art can be overcome.

The invention discloses a solder ring for a magnetron cathode assembly, a method for producing the solder ring for the magnetron cathode assembly and a molybdenum end cap connecting with the solder ring. Solder powder with uniform ingredients is produced through a spray granulation mode, the solder ring for the magnetron cathode assembly is produced through mould pressing, and the molybdenum end cap connecting with the solder ring is produced through a bonding combination mode. The solder ring has good welding performance; the solder powder which is used by the solder ring comprises uniform ingredients, so that the welding quality problem which is caused by the solder ingredient uniform factor is solved; the finished product rate of the method for producing is high, and the production cost is lowered; and according to the molybdenum end cap connecting with the solder ring for the magnetron cathode assembly, subsequent welding technologies are simplified, the method for producing is simple and practicable, and the finished product rate is high.

To provide a magnetron capable of reducing noises in a low frequency band of 30 MHz or less without deteriorating the stability of a load depending on phases, and also ensuring the precision of assembly dimensions without increasing the number of components, a coiled filament 3 is arranged between an input-side end hat 61 and an output-side end hat 7 which are supported by a cathode supporting rod 8. A larger-diameter boss 61 a in the end hat 61 extends to the interior of an interaction space, a smaller-diameter boss 61 b and one end 3a of the filament 3 are secured to each other, and the other end 3b is secured to a boss 7a of the end hat 7. Here, the dimension of an axial free length part F which forms an electron emission part which is not secured to the end hats 61 and 7 of the filament 3 is set to 50% or more and 80% or less of the axial dimension H of plate-like vanes 2, and the electron emission part is arranged so as to be displaced to the output side.

A magnetron has an anode 3 surrounding a tubular hollow cathode 4 which contains a heater 9. The cathode is supported by radial arms at each end. At one end of the cathode, the heater is supplied with one terminal of its D.C. supply by means of a radial arm 5, which also serves to support that end of the cathode. The arm has a portion 5a offset towards the cathode, and a cover of conducting material is interposed between the heater connection and the adjacent end wall 1 of the vacuum envelope. The cover may have a folded portion so that it can be carried by the arm.

The invention discloses a resistive material-based micro electron source and an array thereof and an implementation method. The micro electron source comprises a resistive material unit and an electrode pair connected with the resistive material unit, wherein the electrode pair is used for driving the resistive material unit to emit electrons. A certain number of micro electron sources are arranged on a same substrate to form the array of the micro electron source. The micro electron source and the array thereof disclosed by the invention have the characteristics of being simple in structure, convenient to process, low in working voltage and temperature, good in emission performance and the like, and can be widely used for various electronic devices relating to the electron source.

A radio frequency magnetron device for generating radio frequency power includes a cathode at least partially formed from a diamond material. An anode is disposed concentrically around the cathode. An electron field is provided radially between the anode and the cathode. First and second oppositely charged pole pieces are operatively connected to the cathode for producing a magnetic field in a direction perpendicular to the electric field. A filament is provided within the electron tube which when heated produces primary electrons. Alternatively, a voltage is applied to the anode which causes primary electrons to emit from the diamond coated cathode. A portion of the primary electrons travel in a circular path and induce radio frequency power. Another portion of the primary electrons spiral back and collide with the cathode causing the emission of secondary electrons. The secondary electron emission sustains operation of the magnetron device once the device has been started.

The invention relates to a microwave source apparatus in the technical field of high-power microwaves, in particular an X-waveband high-impedance relativity theory klystron amplifier adopting an annular beam cold cathode. The X-waveband high-impedance relativity theory klystron amplifier is composed of a cathode, a cathode shielding ring, an anode outer cylinder, a high frequency signal injection port, injected waveguide, a resonant cavity, a drift tube, a coaxial extracting structure, a collector, a studdle and a permanent magnetic field; the disadvantages that the traditional high-impedance RKA electronic optical system based on a hot cathode needs an extra heating device and is large in energy consumption, and the system is huge, complex and bad for processing and experimenting are overcome, and the traditional foilless diode is hard to produce the high-impedance annular electronic beam in kOmega level; an annular beam cold cathode with the shielding ring is designed to apply to the X-waveband high-impedance RKA adopting the permanent magnet package, so that the electronic optical system of the microwave tube is simple and compact in structure and easy to process and experiment.

A magnetron comprises an anode, a cathode disposed at a center of the anode, a plurality of vanes radially protruding from an inner surface of the anode towards the cathode, and an upper end shield and a lower end shield respectively coupled to an upper end and a lower end of the cathode so that a length of an effective heating portion of the cathode may be less than a height of the vane. A heating power for the cathode is reduced thus to decrease an input power for the same output, thereby enhancing an efficiency of the magnetron

The invention relates to a novel cold cathode compact amplifier. The novel cold cathode compact amplifier includes a high frequency interaction system, an input structure, an output structure, a collector and a cold cathode electron gun, wherein the high frequency interaction system includes a housing and a cyclic slow wave structure; one end of the housing is in seal connection with the cold cathode electron gun, and the other end of the housing is in seal connection with the collector; the input structure is in seal connection with the housing in a manner of penetrating through the housing,and the input structure is arranged at one end, close to the cold cathode electron gun, on the housing; and the output structure is in seal connection with the housing in a manner of penetrating through the housing, and the output structure is arranged at one end, close to the collector, on the housing. The novel cold cathode compact amplifier utilizes the cold cathode electron gun as the electronsource, coordinates with the cyclic slow wave structure, and utilizes the high frequency field to perform density modulation on the electron beam, and then the modulated electron beam enters the highfrequency interaction system to interact with the high frequency electromagnetic field and realize energy exchange and amplification and output of signals, thus greatly reducing the cycle number of the cyclic structure, and reducing the volume of the electric vacuum amplification device and the device processing difficulty.

The invention discloses cathode salt, a preparation method thereof, a barium-tungsten cathode containing the cathode salt and a preparation method of the barium-tungsten cathode. The cathode salt contained in the cathode comprises BaCO3, CaCO3 and Al2O3, the substance amount ratio among the BaCO3, the CaCO3 and the Al2O3 is 4-5:0.4-0.7:1, and the preparation method of the cathode salt includes the steps of weighing, ball milling, briquetting and sintering. The preparation method of the barium-tungsten cathode containing the cathode salt includes: preparing a cathode substrate, preparing the cathode salt, dipping the cathode salt, lathing the cathode and laminating the emitting surface of the cathode. The barium-tungsten cathode prepared by the cathode salt is resistant to ion bombardment, the service life of microwave tubes is long, and each technical index can meet design requirements.

A cathode component with high efficiency utilizes metal Ti with extremely low heat conductivity as support barrel of cathode so that power consumption of heat conduction can be lowered in order to raise heat efficiency of cathode.