107results about "Transit-tube cathodes" patented technology

The invention provides a double-injection-plane magnetic control injection electron gun. The double-injection-plane magnetic control injection electron gun comprises a focusing electrode, two strip-shaped cathodes, an anode and a magnetic field generation assembly. The focusing electrode comprises two inclined surfaces which extend in the Z-axis direction and are oppositely and obliquely arranged, the two strip-shaped cathodes are respectively arranged on the inclined surfaces of the focusing electrode in parallel, clockwise or anticlockwise rotating inclination is introduced on the inclined surfaces, and the cathodes are configured to respectively escape electrons after being heated; an electric field is formed between the anode and the two strip-shaped cathodes, so that escaped electrons are accelerated to form electron beams; the electron beam rotates under the action of the magnetic field generated by the magnetic field generation assembly so as to form two strip-shaped electron beams, and the included angle between the section, on the XY plane, of the motion trail of the two strip-shaped electron beams and the ZX plane is reduced.

The invention belongs to a microwave source device in the technical field of high-power microwaves, and particularly relates to a permanent magnet packaging high-current diode capable of inhibiting electron beam backflow, which comprises a diode structure and a permanent magnet system, and is characterized in that the diode structure comprises a cathode base, a cathode and an anode outer cylinder; the permanent magnet system comprises a soft magnet, a left first permanent magnet, a left second permanent magnet, a left third permanent magnet, a left fourth permanent magnet, a right first permanent magnet, a right second permanent magnet, a right third permanent magnet, a right fourth permanent magnet and an outer-layer magnet yoke; the whole structure is rotationally symmetrical about a central axis; a gradient matching permanent magnetic field is designed, and magnetic field distribution of a diode area is changed by loading a soft magnetic material, so that a magnetic field line originally pointing to a permanent magnet is bent downwards at the position of a cathode base, and a backflow electron beam is inhibited from moving towards an anode; the cathode base is of a conical structure, the surface electric field intensity of the cathode base is further effectively reduced, and therefore abnormal electron emission of the cathode base is restrained.

The invention discloses a high-power pulse magnetron cathode, and belongs to the technical field of magnetrons. The cathode comprises a heating substrate, an upper end cap, a lower end cap and a cathode emitter, the upper end of the heating substrate is connected with the upper end cap, and the lower end penetrates through the lower end cap and extends out of the magnetron tube core to be connected with a power supply; the heating substrate positioned between the upper and lower end caps is spiral-line-shaped; and the cylindrical cathode emitter is sleeved on the outer side of the spiral linear part of the heating substrate. The cathode emitter is heated through the heating substrate, so that the cathode emitter emits electrons, and the emitted electrons back bomb the surface of the cathode emitter under the action of an external electromagnetic field of the magnetron to generate new secondary electrons. According to the invention, the probability of electron bombardment on the surface of the cathode emitter can be greatly increased, that is, secondary emission electrons can be bombarded continuously, the overall electron emission density of the cathode is improved, and a high-power pulse magnetron is supported to provide higher power output.

The utility model discloses an X wave band magnetron wiring device, which comprises a cathode wiring part, a filament wiring part and an insulating piece, and is characterized in that the cathode wiring part is used for connecting a cathode of an X wave band magnetron and a cathode high-voltage line of a pulse modulation system of an accelerator; therefore, the cathode of the X-band magnetron and the cathode high-voltage line of the pulse modulation system of the accelerator can be conducted. And the filament wiring part is used for connecting a filament of the X-band magnetron and a filament voltage line of a pulse modulation system of the accelerator, so that the filament of the X-band magnetron and the filament voltage line of the pulse modulation system of the accelerator can be conducted. And the cathode wiring part and the filament wiring part are connected into a whole by the insulating part. Compared with the prior art, the wiring device for the X-band magnetron disclosed by the utility model has the advantages that the convenience and the reliability of the wiring work of the cathode and the filament of the X-band magnetron are greatly improved, and the probability that the high-voltage wire falls off and is short-circuited is effectively reduced.

The invention discloses a novel electronic gun for a cyclotron wave protector, and relates to the technical field of vacuum electronic devices. The electron gun comprises a cathode assembly, an anode assembly, a supporting assembly and a permanent magnet system. Wherein the cathode assembly adopts a planar cold cathode structure; the anode assembly comprises an anode main body and an electron beam channel in the anode main body; the cathode and the anode are fixedly connected through a supporting assembly; the permanent magnet system provides a uniform magnetic field. The cold cathode is adopted to replace a traditional hot cathode to generate high-quality strip-shaped electron beams, and the device has the advantages of being simple in structure, easy to integrate, rapid to start, long-acting, reliable, low in consumption and energy-saving.

The invention discloses a relativistic magnetron with an energy feedback structure, and belongs to the technical field of microwaves. The relativistic magnetron is of a full-cavity extraction structure and comprises an anode, a cathode, an energy extraction structure and a guide magnetic field coil. According to the energy extraction structure, an annular microwave reflecting plate is adopted in an output circular waveguide part, part of energy is reflected back to a gap between a cathode and an anode, the interaction between electron cloud and space electromagnetic waves is enhanced, and the output power of a relativistic magnetron is improved. According to the relativistic magnetron, the output power of the relativistic magnetron is effectively improved while the compactness of the device is ensured; meanwhile, the energy feedback structure is simple and easy to process.

The present invention relates to the technical field of filament cathode materials, and in particular to a tungsten alloy wire, a preparation method and use thereof, and a tungsten carbide alloy filament. The tungsten alloy filament comprises the following components: the tungsten alloy comprises the following components: 0.0005-0.3wt% carbon element, 0.25-2.6wt% M element, 0.05-0.5wt% oxygen element, the remainder being tungsten element and inevitable impurities, and the components do not contain thorium element; the initial recrystallization temperature of the tungsten alloy wire is 48%Fc-56%Fc, and / or, the average size of its 80%Fc recrystallized grains is (1-15) μm. The tungsten alloy wire does not contain thorium element and does not have radioactive pollution problem. Its initial recrystallization temperature is between 48%Fc and 56%Fc. Its processing performance is greatly improved compared with thoriated tungsten material. Compared with thoriated tungsten wire, the wire has fewer flaw detection crack points. It is used as the matrix of tungsten carbide alloy filament. After carburization, the tungsten matrix has fine grains. The filament is not easy to break during the production and use of magnetron coils (i.e., filaments), and the production yield and quality are improved.

The invention provides a method for inhibiting micro discharge of a space traveling wave tube, which comprises the space traveling wave tube and comprises the following steps of: depositing an aluminum oxide film on the surface of a ceramic original sample by adopting an alternating action mode of a plurality of precursors; the ceramic original sample is that no film is deposited on the ceramic surface of the space traveling wave tube. The various precursors are trimethylaluminum and water; the deposition temperature is 250 DEG C to 350 DEG C. According to the method, the secondary electron emission coefficient of the surface of the ceramic original sample is reduced and the flashover voltage along the surface is improved by depositing the aluminum oxide thin film on the surface of the ceramic original sample, so that the probability of micro discharge of the space traveling wave tube is reduced, and the method has a relatively good application prospect in the aspect of solving the micro discharge of the space traveling wave tube; the method has important application value for improving the reliability of the space traveling wave tube in the spacecraft.

The invention discloses a high-power pulse magnetron cathode heater assembly, a preparation method and an application. The preparation method comprises the following steps: winding a tungsten filament, and sequentially carrying out primary high-temperature shaping, insulating layer coating and secondary high-temperature sintering to prepare a required heater; preparing a cathode blank with a tantalum sponge body; preparing a cathode prefabricated part with the tantalum sponge body; coating the composite rare earth oxide turbid liquid, and sintering in a high-temperature vacuum furnace to obtain the required cathode; and assembling the cathode and the heater, filling the space between the cathode and the heater with a heat-conducting and electric-conducting material, and sintering in a vacuum furnace to prepare the cathode and heater assembly. The cathode heater assembly has high heat emission and secondary electron emission, has good electron and ion bombardment resistance, prolongs the service life, and can adapt to the working environment of a high-power pulse magnetron; and the device also has the characteristics of low cathode heating power, high thermal emission current density and the like, and can be quickly started.

A tungsten alloy wire, a preparation method therefor and a use thereof, and a tungsten carbide alloy filament. The tungsten alloy wire comprises the following components: 0.0005-0.3 wt% of a carbon element, 0.25-2.6 wt% of an M element, 0.05-0.5 wt% of an oxygen element and the balance being a tungsten element and inevitable impurities, and does not comprise a thorium element; and the initial recrystallization temperature of the tungsten alloy wire ranges from 48 %Fc to 56 %Fc, and / or the average size of 80 %Fc recrystallization grains is 1-15 μm. The tungsten alloy wire does not comprise the thorium element, does not cause radioactive contamination, has the initial recrystallization temperature ranging from 48 %Fc to 56 %Fc, and has the processing performance greatly improved compared with that of a thorium-containing tungsten wire; compared with a thorium-containing tungsten wire, the tungsten alloy wire has less flaw detection crack points, when the tungsten alloy wire is used as a substrate of a tungsten carbide alloy filament, grains of the carbonized substrate are fine, the filament is not easy to break in the production and use of a magnetron coil, and the production yield and quality are improved.

A cathode heater assembly for use in a vacuum electronic device comprises a refractive cup having a bottom portion and side walls forming a container; a cathode secured in the container of the refractive cup; and a heater wire coupled to the refractive cup. The cathode heater assembly may be manufactured by providing a refractive cup having a bottom portion and side walls forming a container; inserting a cathode pellet in the container of the refractive cup; impregnating the cathode pellet with electron emissive materials while the cathode pellet is in the container of the refractive cup; and attaching a heater wire to the refractive cup.

The utility model discloses a kind of cathode heater subassemblies for klystron electron gun, it is characterized in that, including: cathode base, heater sleeve, heater and detachable heat shield assembly, the upper and lower two end surfaces of cathode base are respectively provided with emitting surface and mounting groove, heater sleeve is detachably fixed in mounting groove, and the end surface of heater sleeve back to cathode base is equipped with accommodating groove;Heater is installed in accommodating groove, and the part of heater in accommodating groove is wrapped with insulating layer;Heat shield assembly includes outer heat shield and inner heat shield, outer heat shield is sleeved in cathode base, and inner heat shield is installed in outer heat shield and covers heater sleeve and heater.The utility model can realize reversibility dismounting and maintenance, and heater material volatilization can be avoided directly deposited on the emitting surface of cathode base, help to maintain the emitting surface cleanliness of cathode base, to improve electron emission efficiency, high-temperature solder can also be reduced in use, reduce cost.

The invention relates to the field of electron tubes, and discloses a low-evaporation three-layer film cathode assembly for a space traveling wave tube, which comprises a tungsten substrate positioned on a substrate; the first layer of rhenium film and the rhenium film cover the tungsten substrate; the carbon nanotube composite material layer is deposited on the rhenium film; the second osmium-tungsten film is deposited on the carbon nanotube layer; the third osmium-ruthenium film is deposited on the osmium-tungsten film; wherein the thicknesses of the rhenium film, the carbon nanotube layer, the osmium-tungsten film and the osmium-ruthenium film are respectively controlled to be 0.5-2 mu m, 10-50 nm, 50-200 nm and 20-100 nm, and the carbon nanotube composite material layer is obtained by growing on the rhenium film through chemical vapor deposition. By adopting the osmium-tungsten and osmium-ruthenium films with high crystallinity and the optimized carbon nanotube composite material layer, the electron emission efficiency of the cathode assembly is remarkably improved, so that the energy required by electron emission is reduced, and the electron output quantity under the same working condition is increased.

To provide a magnetron with a novel structure in which the cathode is, in principle, not subjected to back bombardment by electrons.SOLUTION: A magnetron 100 includes a cylindrical anode body 10 in which a plurality of resonant cavities 60 are formed, a cathode body 20 arranged on the central axis of the anode body, and a pair of magnetic poles 30a, 30b that apply a magnetic field parallel to the central axis to an action space 50 surrounded by the inner surface at the portion where the resonant cavities of the anode body are formed. The cathode body has an electron emitter 22 that emits electrons in a direction parallel to the central axis, and the electron emitter is arranged at a distance from the action space in the direction of the central axis.SELECTED DRAWING: Figure 1

This application provides a travelling-wave tube, an electron gun, and a power amplification system, to improve electronic efficiency of the travelling-wave tube when the travelling-wave tube performs linear amplification on a radio frequency signal, thereby effectively reducing power consumption of the travelling-wave tube. The travelling-wave tube includes an input apparatus, a control circuit, an electron gun, a slow-wave circuit, and an output apparatus. The input apparatus may be configured to: receive a radio frequency signal, and feed the radio frequency signal into the slow-wave circuit. The control circuit may be configured to: determine a quantity N of electron beams and currents of the N electron beams, and control the electron gun to emit the N electron beams. Further, the slow-wave circuit may perform beam-wave interaction with the N electron beams, to amplify power of the radio frequency signa, and because the slow-wave circuit works in a saturation region, electronic efficiency of the travelling-wave tube can be greater than or equal to a first threshold. The output apparatus may output an amplified radio frequency signal.

The invention relates to the technical field of filament cathode materials, in particular to a tungsten carbide alloy filament, a preparation method thereof and a heating device. The tungsten carbide alloy filament comprises a base body and a carbonization layer attached to the outer surface of the base body. The grain width of the carbonized layer is 1.0 [mu] m to 15.0 [mu] m; the components of the matrix and the carbonized layer comprise a tungsten element, a carbon element, an oxygen element and an M element; the M element is selected from one or a combination of more of La, Y, Sc, Nd, Sm, Lu, Ce, Gd, Tb, Dy, Ho, Pr, Er, Tm, Yb, Eu, Hf and Zr; wherein the component of the tungsten carbide alloy filament does not contain a thorium element. The emission stability of the tungsten alloy lamp filament is improved, the stable emission capability of a traditional thorium tungsten lamp filament can be achieved under the condition that no thorium element is added, the problem that an existing tungsten lamp filament without thorium is poor in stable emission capability is solved, and the problem of radioactive contamination of the traditional thorium tungsten lamp filament is solved.

A cathode heater assembly for use in a vacuum electronic device comprises a refractive cup having a bottom portion and side walls forming a container: a cathode secured in the container of the refractive cup; and a heater wire coupled to the refractive cup. The cathode heater assembly may be manufactured by providing a refractive cup having a bottom portion and side walls forming a container; inserting a cathode pellet in the container of the refractive cup; impregnating the cathode pellet with electron emissive materials while the cathode pellet is in the container of the refractive cup; and attaching a heater wire to the refractive cup.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking electric appliance. The cathode filament is used for the magnetron, the cathode filament is in a spiral structure, the cathode filament comprises two non-main emission areas and a main emission area, the two non-main emission areas are connected to two sides opposite to the main emission area along the length direction of the cathode filament, and the pitch of the non-main emission area is greater than the pitch of the main emission area. In the cathode filament, the pitch of the non-main emission area outside the main emission area is greater than the pitch of the main emission area, the stress of the non-main emission area can be more dispersed, the stress of the cathode filament at the non-main emission area can be effectively reduced, and the breaking resistance of the cathode filament after carbonization is improved.

The invention provides a composite film M-type hot cathode and a preparation method thereof. The composite film layer M-type hot cathode comprises a barium tungsten cathode substrate, a Re3W alloy phase barrier layer and a noble metal surface layer, and the Re3W alloy phase barrier layer is formed between the barium-tungsten cathode substrate and the noble metal surface layer. The composite film layer M-type thermionic cathode can effectively prevent alloying between the tungsten substrate and the precious metal film layer, so that the emission capability of the cathode is improved, and the service life of the cathode is prolonged.

The embodiment of the present invention discloses a cathode thermal subassembly for a klystron electron gun, comprising: a cathode base; a cathode disposed on the top of the cathode base; a thermal subassembly located in the cathode base; a heat shield fixed in the cathode base, the heat shield being disposed below the thermal subassembly; and a cathode base disposed at the bottom of the cathode base, the cathode base being configured to reduce the heat conduction of the thermal subassembly; the cathode base being a basket-shaped structure, comprising a first ring body, a second ring body, and a plurality of support rods disposed between the first ring body and the second ring body, the two ends of the support rods being respectively fixed to the first ring body and the second ring body; the first ring body and the second ring body being disposed in parallel and concentrically. By designing the cathode base at the connection between the electron gun cathode thermal subassembly and the klystron cavity structure into a basket-shaped structure, heat conduction is effectively reduced, the stability of the electron gun is improved, and the life of the klystron is extended.

The present application relates to an electron gun, which has a cathode having an electron emission surface, a planar shape of which is circular, and which emits electrons, a heater which warms the cathode, and an anode which applies a positive potential to the cathode and extracts the electrons in a certain direction. The cathode has a through-hole along a central axis of the cathode in a central portion thereof, and at least one of an opening edge portion of the through-hole on the electron emission surface side and an inner surface of the through-hole has a non-emission layer, or the opening edge portion of the through-hole on the electron emission surface side is a chamfered C face or a chamfered R face.

The application provides a cathode heater subassembly for a traveling wave tube and a preparation method, and belongs to the technical field of electric vacuum devices. The cathode heater subassembly comprises a cathode cake, a solid spherical cathode used as an electron source of the traveling wave tube to emit electrons; a heater, a composite structure composed of a boron nitride insulating layer, a graphite electrode layer and a boron nitride covering layer, the graphite electrode layer is located between the boron nitride insulating layer and the boron nitride covering layer, the graphite electrode layer is a single helix structure, the boron nitride insulating layer is brazed to the bottom of the cathode cake, and the heater is used for heating the cathode cake; a heater lead, comprising a first heater lead and a second heater lead, the first heater lead is brazed to a first end of the single helix structure of the graphite electrode layer through the boron nitride covering layer, the second heater lead is brazed to a second end of the single helix structure of the graphite electrode layer through the boron nitride covering layer, the first end is a position away from the center of the single helix structure of the graphite electrode layer, and the second end is a position close to the center of the single helix structure of the graphite electrode layer.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking appliance. The cathode filament has a spiral structure, and a filament material of the cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in a circumferential direction of the filament core, a material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer. In the cathode filament, the material of the filament core comprises the lanthanum tungsten material, and the carbonized layer comprises the lanthanum tungsten carbonized layer, which reduces the work function of the cathode filament to a certain extent, improves the migration ability of rare earth elements in the cathode filament, and thus the electron emission ability of the cathode filament can be improved to a certain extent, so that the magnetron can adapt to more power requirements of the microwave cooking appliance.

The present application relates to a cathode and a manufacturing method thereof. The method includes: mixing and reacting cations containing a cathode element with a precipitant in a solution to obtain a gelatinous precipitate; and coating the gelatinous precipitate on a surface of a cathode substrate, which is configured for forming the cathode.

Disclosed are a tube core (12) of a magnetron (100), the magnetron (100) and a microwave appliance. The tube core (12) of the magnetron (100) comprises: an anode component (20), the anode component (20) comprising an anode cylinder (28), wherein an interaction space (38) is provided in the anode cylinder (28); a cathode component (22), the cathode component (22) comprising a filament (40), wherein the filament (40) is located in the anode cylinder (28); and a magnetic pole component (26), the magnetic pole component (26) comprising a first magnetic pole (42) and a second magnetic pole (44), wherein the first magnetic pole (42) and the second magnetic pole (44) are respectively arranged at two ends of the anode cylinder (28) in a first direction, and the first magnetic pole (42) and the second magnetic pole (44) have different shapes and configurations.

The application discloses a kind of solder, solder slurry, magnetron cathode assembly and preparation method thereof, it is related to magnetron cathode assembly field.Therein, solder is obtained by 15-40wt% tungsten, 30-60wt% molybdenum and 15-40wt% nickel mixed ball milling.Solder slurry includes organic carrier, solvent and solder, organic carrier is 5-15% of the weight of the solder, solvent is 5-20% of the weight of the solder.Lamp filament and molybdenum end cap in magnetron cathode assembly are brazed using the above-mentioned solder, specific operation method is that solder slurry is coated on molybdenum end cap, sintering forms solder layer, then again heating melts solder layer to weld and fix lamp filament and molybdenum end cap.The solder in the present application has the advantages of low cost, low brazing temperature and wide range, low vapor pressure, can improve the welding effect of lamp filament and molybdenum end cap while reducing the bubbling probability of molybdenum end cap, so as to improve the qualified rate of finished product of magnetron cathode assembly.

A travelling-wave tube includes an input apparatus, a control circuit, an electron gun, a slow-wave circuit, and an output apparatus. The input apparatus may be configured to receive a radio frequency signal, and feed the radio frequency signal into the slow-wave circuit. The control circuit may be configured to determine a quantity N of electron beams and currents of the N electron beams, and control the electron gun to emit the N electron beams. Further, the slow-wave circuit may perform beam-wave interaction with the N electron beams, to amplify power of the radio frequency signa, and because the slow-wave circuit works in a saturation region, electronic efficiency of the travelling-wave tube can be greater than or equal to a first threshold. The output apparatus may output an amplified radio frequency signal.

The utility model discloses a tool for sealing a cathode supporting assembly of a traveling wave tube, relates to the technical field of traveling wave tube assembly, and is mainly used for solving the defects of the conventional tool for sealing. According to the main structure, the device comprises a base, the upper surface of the base is connected with an emitter installation boss, the outer side of the emitter installation boss is sleeved with a positioning sleeve, and the inner wall of the positioning sleeve is provided with a positioning step; a pressing cap is arranged above the positioning sleeve, an emitter pressing block is arranged below the pressing cap, a supporting seat pressing block is arranged on the upper surface of the pressing cap, and a supporting frame pressing block is arranged on the upper surface of the supporting seat pressing block. The utility model provides a tool for sealing a traveling wave tube cathode support assembly, which can effectively fix each part of the cathode support assembly in the brazing process and avoid displacement of each part.

The utility model discloses a continuous wave magnetron cathode assembly capable of suppressing microwave leakage, which comprises a cathode porcelain group, a cathode core rod group, a filament cylinder fixed in the cathode porcelain group, and a multistage outer choke group and a multistage inner choke group capable of suppressing leakage of a plurality of microwaves with different frequencies, the multi-stage outer choke group is coaxially arranged between the cathode porcelain group and the filament cylinder, and the multi-stage inner choke group is coaxially arranged between the cathode core rod group and the filament cylinder. According to the utility model, by arranging the multi-stage outer choke group and the multi-stage inner choke group, a plurality of microwaves with different frequencies can be effectively suppressed, a key area of microwave leakage can be covered to the greatest extent, the microwave leakage amount is remarkably reduced, and the problem of multi-frequency microwave leakage of a cathode part of a traditional continuous wave magnetron is fundamentally solved; the interference of microwave leakage on the surrounding environment and equipment is greatly reduced, and the working stability and safety of the continuous wave magnetron are improved.

This invention discloses an oxide cathode and its sintering apparatus. The oxide cathode includes a cathode cylinder and a porous sponge layer. The cathode cylinder has two annular stepped surfaces, which are spaced apart from each other along the axial direction of the cathode cylinder. The cathode cylinder also has a sintering region located between the two stepped surfaces. The sponge layer is disposed within the sintering region, with its two ends respectively attached to the two stepped surfaces. Simultaneously, the sponge layer does not protrude from the stepped surfaces radially within the cathode cylinder. This invention can effectively suppress the axial scattering of electrons from the non-emission region of the oxide cathode, reduce interference with high-frequency fields, reduce the bombardment of the magnetron anode end cap by scattered electrons from the non-emission region, effectively solve the oxidation problem of the anode end cap during magnetron use, and improve the overall performance of the magnetron.