62results about "Transit-tube cathodes" patented technology

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 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.

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 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.

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.

The present invention discloses a P-band full-cavity extraction relativistic magnetron, which belongs to the field of high-power microwave technology. It includes a vacuum chamber, an anode, an axial extraction structure, and a cathode arranged inside the anode, which are connected in sequence along the axial direction; wherein the anode includes an anode shell, N large fan-shaped anode blades and N small fan-shaped anode blades, and there is a fan-shaped gap between the outer side of the small fan-shaped anode blades and the anode shell; the axial extraction structure includes a mode conversion section and a coaxial output section. The present invention proposes a P-band full-cavity extraction relativistic magnetron, which reduces the guide magnetic field compared to the relativistic backward wave tube; improves the energy conversion efficiency compared to the magnetic isolation line oscillator; and reduces the radial size and improves the compactness of the system compared to the relativistic magnetron with a traditional full-cavity extraction structure. Therefore, the full-cavity extraction relativistic magnetron of the present invention takes into account compactness, low magnetic field, and high efficiency while ensuring fundamental mode output.

A power module comprises a high frequency switching electronic power conditioner including stacked rectifier / filters, the stacked rectifier / filters generating stacked DC output voltages; and a vacuum electronic device coupled to the high frequency switching electronic power conditioner, the vacuum electronic device including components, each component receiving a respective DC output voltage of the stacked DC output voltages.

The application discloses an S-band high-power pulsed magnetron and belongs to the field of vacuum electron devices. The device comprises an anode assembly, a cathode assembly, an input assembly, an output assembly and a permanent magnet. The application adopts an axial output structure, improves the sizes and proportions of the anode and the cathode, simultaneously increases the anode voltage, adopts the permanent magnet to provide a constant magnetic field, and can output a pulsed microwave power of more than 100kW on the basis of a small size.

The application discloses a relativistic magnetron with an energy feedback structure and belongs to the microwave technical field.The relativistic magnetron is a full-cavity extraction structure and comprises an anode, a cathode, an energy extraction structure and a guide magnetic field coil; wherein the energy extraction structure is provided with a ring-shaped microwave reflection plate in an output circular waveguide part, part of energy is reflected back to a cathode-anode gap, the interaction between an electron cloud and a space electromagnetic wave is enhanced, and the output power of the relativistic magnetron is improved. The application effectively improves the output power of the relativistic magnetron while guaranteeing the compactness of the device; meanwhile, the energy feedback structure is simple and easy to process.

Provided are a control circuit (100) and a microwave generation device (200). The control circuit (100) is applied to the microwave generation device (200) including a magnetron (36). The control circuit (100) includes a transformer assembly (12) and a switch portion (20). The transformer assembly (12) includes a primary winding (14), a first secondary winding (16), and a second secondary winding (18). The primary winding (14) is located at a primary side of the transformer assembly (12). The first secondary winding (16) and the second secondary winding (18) are located at a secondary side of the transformer assembly (12). The first secondary winding (16) and a cathode (37) of the magnetron (36) form a filament circuit (26). The switch portion (20) includes a switch member (22) and a control member (24). The switch member (22) is located in the filament circuit (26). The control member (24) is electrically connected to a control winding (19) and configured to control the switch member (22) to turn off or turn on the filament circuit (26) when a current in the control winding (19) changes. The control winding (19) is one of windings of the transformer assembly (12), and the control winding (19) and an anode (38) of the magnetron (36) form an anode circuit (27).

The application discloses a strip-shaped multi-beam electron gun, and relates to the technical field of electronic devices, which comprises a cathode array assembly, a multi-beam focusing electrode assembly and a multi-beam anode assembly arranged in sequence along an electron transmission direction; the cathode array assembly is composed of a plurality of array-distributed emission cathodes for emitting electron beams; an acceleration electric field is formed between the cathode array assembly and the multi-beam anode assembly; the multi-beam focusing electrode assembly is arranged on the emission side of the cathode array assembly; the grooves and the baffles of the multi-beam focusing electrode assembly are used for compressing and controlling the shape, size and beam waist position of the multi-electron beams, so that the effect of focusing multi-electron beams by a single focusing electrode is achieved; the plurality of anode channels, the plurality of focusing holes and the plurality of emission cathodes are coaxially arranged in one-to-one correspondence; the electrons emitted by the emission cathodes enter the size-gradually-changing anode channels after being accelerated by the electric field and compressed and shaped by the focusing electrode, so that the multi-beam strip-shaped electron beam output with large current and high quality is realized, and the guarantee of the electron source for the high-power output of the terahertz source is provided.

The invention discloses a tube core of a magnetron, the magnetron and a microwave electric appliance. According to the embodiment of the invention, the tube core of the magnetron comprises an anode part which comprises an anode cylinder, and the interior of the anode cylinder is provided with an interaction space; the cathode component comprises a lamp filament, and the lamp filament is located in the anode cylinder; the magnetic pole component comprises a first magnetic pole and a second magnetic pole, the first magnetic pole and the second magnetic pole are arranged at the two ends of the anode cylinder in the first direction respectively, and the first magnetic pole and the second magnetic pole are different in shape and structure. In the tube core of the magnetron, the first magnetic pole and the second magnetic pole have different shapes and structures, so that the magnetic field distribution of the interaction space can be changed through the magnetic pole structures, more electrons in the interaction space are in steady-state motion, the purpose of energy exchange is achieved, the generation of stray electrons is reduced, and the noise emitted outwards by the magnetron is reduced.

The invention provides an electron gun for a terahertz traveling wave tube and the traveling wave tube. The electron gun comprises an anode piece; the focusing electrode piece is positioned in the anode piece; the outer insulating ceramic ring is positioned between the anode piece and the focusing pole piece; the cathode piece is positioned in the focusing electrode piece; the inner insulating ceramic ring is positioned between the cathode piece and the focusing pole piece; the anode piece, the focusing pole piece and the cathode piece are all made of non-magnetic metal materials. Stress release structures are formed at the sealing part of the focusing electrode piece and the outer insulating ceramic ring and the sealing part of the cathode piece and the inner insulating ceramic ring; the stress release structure is configured to release tensile stress formed in the sealing process due to the difference of thermal expansion coefficients of different materials by changing the geometrical shape of the corresponding sealing position.

The present invention discloses a cathode heater assembly for a high-power pulse magnetron, a preparation method, and applications. The assembly comprises a tungsten wire wound into a desired shape, followed by a primary high-temperature shaping step, an insulating layer coating, and a secondary high-temperature sintering step to produce the desired heater. A cathode blank with a tantalum sponge is prepared; a cathode preform with a tantalum sponge is coated with a composite rare earth oxide suspension and sintered in a high-temperature vacuum furnace to produce the desired cathode. The cathode and heater are assembled, and the space between the cathode and heater is filled with a thermally conductive and electrically conductive material before being sintered in a vacuum furnace to produce the cathode heater assembly. The cathode heater assembly of the present invention exhibits high thermal emission and secondary electron emission, and good resistance to electron and ion bombardment, thereby extending its service life while adapting to the operating environment of a high-power pulse magnetron. The assembly also features low cathode heating power, high thermal emission current density, and rapid startup.

The invention relates to a compact radial high-power microwave generator, and belongs to the technical field of high-power microwaves. The device is composed of a cathode 1, a first drift section 2, a coupling cavity 3, a second drift section 4, a radial slow wave structure 5, an electron beam collector 6, a radial coupling channel 7, a mode converter 8 and an output waveguide 9. The invention relates to a compact radial high-power microwave generator which is of a circumferential symmetrical structure, mainly utilizes interaction between a high-current relativistic electron beam radially emitted by a cathode 1 and a transverse electric mode in a radial slow wave structure 5, and outputs microwaves through outward coupling of a coupling cavity 3 near the cathode side. Therefore, the purposes of reducing the axial size of the radial high-power microwave generator and realizing hollow waveguide single-mode output are achieved.

The present invention relates to the technical field of filament cathode materials. Disclosed are a tungsten carbide alloy filament and a preparation method therefor, and a heating device. The tungsten carbide alloy filament comprises a base body (100) and a carbonization layer (200) attached to the outer surface of the base body (100), wherein the grain width of the carbonization layer (200) is 1.0-15.0 µm; the components of the base body (100) and the carbonization layer (200) both comprise tungsten, carbon, oxygen and an M element, the M element being 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; and the components of the tungsten carbide alloy filament do not contain thorium. The material improves the emission stability of the tungsten alloy filament, and can also reach stable emission capability of a traditional thorium-tungsten filament without adding thorium, thereby solving the problem of relatively poor stable emission capability of an existing thorium-free tungsten filament, and avoiding the radioactive contamination problem of a traditional thorium-tungsten filament.

Provided is an electromagnetic wave generation device with which it is possible to determine the cause of an abnormality occurring in the interior thereof.　The present invention comprises: a negative electrode (1); a first positive electrode (2) which is disposed facing the negative electrode and through which electrons can pass; a cylindrical waveguide (3) that is disposed on the side of the first positive electrode opposite from the negative electrode and guides electromagnetic waves; an output window (30) that is disposed at the end portion of the waveguide on the side opposite from the first positive electrode and outputs electromagnetic waves; a first current sensor (41) that detects current data pertaining to an electron beam emitted from the negative electrode; a second current sensor (42) that detects current data pertaining to the electron beam traveling within the waveguide; and an abnormality determination device (60) that determines an internal abnormality on the basis of the current data detected by the first current sensor and the current data detected by the second current sensor.

A microwave source used in the radiotherapy device can be provided. The microwave source may include an anode block and one or more cathodes. The cathode of the microwave source may include a cathode support element having a plurality of slots. The plurality of slots can be axially around a circumference of the cathode support element. The microwave source may include a cathode heater including at least one filament. A first part of the at least one filament may be wound around the cathode support element along a first direction and received by a first portion of the plurality of slots, and a second part of the at least one filament may be wound around the cathode support element along a second direction and received by a second portion of the plurality of slots.

The invention relates to the technical field of vacuum electronic devices, and provides a composite cathode, a cathode focusing electrode structure and a preparation method of the composite cathode. The composite cathode comprises a cathode body and a composite ring, a spherical groove is formed in one end of the cathode body, the composite ring is arranged on the peripheral wall of the cathode body in a sleeving mode and is arranged on the inner side of the focusing electrode in an inserted mode, the composite ring is provided with an annular face extending in the circumferential direction of the composite ring, and at least part of the composite ring is exposed out of a notch of the spherical groove. The annular surface is positioned between the inner wall surface of the spherical groove and the inner wall surface of the focusing electrode; and the annular surface and the inner wall surface of the spherical groove form a smooth curved surface. According to the composite cathode disclosed by the invention, the turning quality of the cathode curved surface corresponding to the composite cathode can be ensured, the laminar flow property of the electron beam at the outer edge of the cathode is greatly improved, and the transmission state of the electron beam is ensured.

The disclosure provides a double injection planar magnetic control injection electron gun, which comprises a focusing electrode, two strip-shaped cathodes, an anode and a magnetic field generating assembly. The focusing electrode comprises two inclined surfaces extending in the Z-axis direction and arranged oppositely, the two strip-shaped cathodes are respectively installed on the inclined surfaces of the focusing electrode in parallel with each other, and the inclined surfaces are introduced with clockwise or counterclockwise rotation, and the cathodes are configured to respectively emit electrons after being heated; the anode forms an electric field with the two strip-shaped cathodes to accelerate the emitted electrons to form an electron beam; the electron beam rotates under the action of the magnetic field generated by the magnetic field generating assembly to form two strip-shaped electron beams, and reduce the included angle between the cross section of the motion trajectory of the two strip-shaped electron beams in the XY plane and the ZX plane.