31 results about "Hot cathode" patented technology

The invention relates to the technical field of plasma discharge control, in particular to a hot cathode filament discharge control method and system and controllable nuclear fusion equipment, and the method comprises the steps: obtaining a target arc current value and target discharge time of a hot cathode filament, and calculating a voltage feed-forward value of the hot cathode filament according to the target arc current value and the target discharge time; in response to a discharge control instruction of the thermionic cathode filament, calculating a voltage feedback value of the thermionic cathode filament according to the actual arc current value and the target arc current value of the thermionic cathode filament; and controlling the hot cathode filament to discharge according to the voltage feed-forward value and the voltage feedback value. Therefore, the problems that when the hot cathode filament discharges, due to the fact that the thermal inertia of the filament is large and a control method in the related technology is difficult to adapt to parameter changes under different discharge conditions, plasma discharge response is slow, and adaptability is poor are solved.

To stably form an insulating film of high quality in a reactive ion plating apparatus and method.SOLUTION: In the reactive ion plating apparatus 10, an evaporation material 24 stored in a crucible 20 is heated and evaporated by an electron gun 22. In addition, the ionization power Wd is supplied to the crucible 20 as an anode and the hot cathode filament 34 that emits thermoelectrons as a cathode. Accordingly, the plasma 100 is induced. Further, the reactive gas is introduced into the vacuum chamber 12 through the hollow anode 46, and the hollow anode power Wh is supplied to the hollow anode 46. Accordingly, the hollow anode plasma 200 is induced. A hollow anode filament 48 is provided at a gas discharge port of the hollow anode 46. The hollow anode filament 48 becomes a stable anode by being heated by Joule heat.SELECTED DRAWING: Figure 1

The invention discloses a vacuum measuring tool and a vacuum degree measuring method, and the vacuum measuring tool comprises a measuring circuit which comprises a power supply which is a constant-voltage constant-frequency AC power supply; a resistive element; the current detection element is connected in series with the resistance element and is used for acquiring a current measurement value of the measurement circuit; the capacitor assembly is connected with the resistor element in series; a medium space between polar plates of the capacitor assembly is used for being communicated with a to-be-measured space, a current measurement value collected by the current detection element is in positive correlation with a capacitance value of the capacitor assembly, and the capacitance value of the capacitor assembly is in positive correlation with the vacuum degree of the to-be-measured space. According to the invention, the capacitor assembly is adopted to form the measurement circuit, the conversion from the collected current measurement value to the vacuum degree is realized, the device can be suitable for the measurement in different vacuum states, the precision is high, the integration degree is high, the space is saved, and the system complexity and the maintenance cost are reduced; and the technical barrier that a hot cathode vacuum gauge receives hot electrons is effectively avoided, and the problem that a high-vacuum measuring tool is short in service life is fundamentally solved.

The invention discloses a hot cathode for a vacuum device and a preparation method and application of the hot cathode. The structure of the hot cathode comprises a cathode substrate and an emission active material combined on the cathode substrate; wherein the cathode substrate is of a porous structure, and the cathode substrate is made of a mixture of chromic oxide and tungsten; and the emission active material is scandium-containing barium aluminate. According to the scheme, the problem that the requirement of a current high-power vacuum electronic device for a low-working-temperature and high-emission-current-density electron source cannot be met is well solved.

This invention relates to the field of aerospace propulsion technology, and in particular to an oxygen-resistant Hall thruster electric propulsion system, comprising a Hall thruster, a radio frequency neutralizer, a power processing unit, a working propellant storage and supply system, and an integrated electronic control system. This invention establishes an electrical connection between the Hall thruster and the radio frequency neutralizer, directly connecting the collecting electrode to the negative terminal of a high-voltage power supply, eliminating the holding electrode and its independent power supply branch. Simultaneously, it combines a dual-path working propellant supply structure with oxidation-resistant conductive materials for the anode and collecting electrode. This allows the radio frequency neutralizer to rapidly establish a plasma electron source without the need for traditional hot cathode preheating. After the Hall thruster ejects the ion beam, electrons are automatically extracted based on the potential gradient. This not only reduces the complexity of the system's power supply structure and improves the discharge stability and electron compensation capability in low-purity working propellants and oxygen-containing environments, but also enhances the system's oxygen-resistant lifetime and rapid start-up performance in low Earth orbit oxygen-rich environments.

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.

This invention discloses a novel welding machine, comprising: a welding frame, the welding frame including a support frame, a sealed door on the front of the support frame, a welding chamber at the upper end of the inner cavity of the support frame, and a welding table at the bottom of the inner cavity of the welding chamber. This invention belongs to the field of welding machine technology. The purpose of this invention is to solve the problems of traditional hot cathode electron beam welding machines in the prior art, where the hot cathode requires continuous preheating, has a long start-up time, and still needs to maintain a high temperature in standby mode. The technical effect achieved is: using a directional carbon nanotube array microbeam emitter as a cold cathode, utilizing the field emission principle of carbon nanotubes, an electric field is applied between the grid and the cathode to allow electrons to escape from the tip of the carbon nanotube through quantum tunneling effect, without heating the cathode to a high temperature, achieving millisecond-level instantaneous start-up, solving the drawback of traditional welding machines requiring 5-10 minutes of preheating, and significantly improving work efficiency and equipment response speed.

The invention discloses a long pulse debugging method for a large-area thermionic cathode ion source, and belongs to the technical field of thermionic cathode ion sources, and the method comprises the steps: carrying out the air inlet vacuum debugging after the ion source is assembled; the insulation and voltage endurance capability is improved through cold high-voltage exercise; turning off high voltage, lighting a lamp filament, applying arc voltage, and cleaning the cavity through arc chamber plasma discharge; the extraction voltage is gradually applied to perform beam extraction exercise, and beam transmission is optimized through diversion coefficient scanning; and finally, the diversion coefficient is reduced, the pulse width is prolonged, and long-pulse discharge debugging is realized. According to the method, a systematic debugging process from vacuum verification, insulation and voltage resistance, cavity cleaning to beam extraction and long pulse discharge is established, the stability and reliability of the ion source can be effectively improved, the breakdown risk is reduced, and a technical basis is provided for long-term stable operation of a large-area hot cathode ion source in the future.

To provide an indirect heated cathode capable of shortening the time up to a start of radiation of thermoelectrons, and a method of manufacturing the indirect heated cathode in which a heat absorption layer which has a uniform thickness can be easily manufactured.SOLUTION: An indirect heated cathode 10 comprises a cathode sleeve 1, a heater 2 arranged at a hollow part of the cathode sleeve 1, a black heat absorption layer 4 covering a hollow part inner surface of the cathode sleeve 1, and a cathode base body 3 carrying an electron emission substance arranged at the cathode sleeve 1. The black heat absorption layer 4 consists of a particulate substance including tungsten and aluminum oxide. The black heat absorption layer 4 is formed by arranging rod-like alumina ceramics, and a first tungsten heater and a second tungsten heater in the hollow part of the cathode sleeve 1 and heating it in a vacuum atmosphere.SELECTED DRAWING: Figure 1

The invention discloses a high-charge heavy-ion high-energy-intensity laser. A high-intensity single-charge heavy-ion beam is obtained by transversely colliding a single-charge heavy-ion beam injection section with a low-speed multi-surface side-by-side correlation surface electron flow containing an unionized atom return channel; a high-intensity single-charge heavy ion beam is converted into a high-intensity high-charge heavy ion beam with the ionization degree of mu by adopting a flat runway-shaped high-speed multi-surface side-by-side correlation surface electron flow transverse collision high-charge heavy ion ionization ring with two high-charge ionization regions; high-charge heavy ion high-energy laser and heavy ion beam emission is realized by adopting a flat runway-shaped high-speed multi-surface side-by-side correlation surface electron flow to transversely collide with a high-charge heavy ion excitation ring. The intensity of surface electron flow, heavy ion beam and laser beam can be greatly improved by adopting the electrified thermionic cathode which is connected in parallel with the high-capacity super capacitor and has the width increased by more than five times. According to different laser wavelengths and powers, various practical purposes can be achieved from obtaining of a high-contrast holographic image of an internal atomic structure of a organism to serving as a novel high-energy strong laser weapon.

An arc chamber for an ion source defines a chamber volume, and a target material is disposed within the chamber volume. The target material includes a dopant species and may be included in the target member. An indirect heating cathode is disposed within the chamber volume and ionizes the source gas within the chamber volume thereby defining a plasma having plasma thermal radiation. The target heater selectively heats the target material independently of plasma thermal emission associated with the plasma. The target heater may be a resistive heating element, an induction heating element, a halogen heating element, or a laser configured to selectively heat at least a portion of the target member. The target member may be composed of a solid dopant material, or may include a liquid dopant material.

The invention discloses a dynamic gear shifting processing method and system based on a hot cathode ionization vacuum gauge, and relates to the technical field of vacuum measurement, and the method comprises the steps: obtaining a compensation value based on an improved ion current collection and amplification circuit, and obtaining the current vacuum degree through the calculation of the compensation value; judging the dynamic change condition of the measurement environment according to the obtained gear shifting requirement, and judging whether the gear shifting condition is met or not under the corresponding dynamic change condition; when the gear shifting condition is met, the corresponding gear interval is entered, and the vacuum degree after the preset time under the corresponding dynamic change condition is obtained based on the current vacuum degree; and the phenomena of blockage, repeated values, numerical value loss and the like of the vacuum gauge in the gear shifting process are solved.

The invention relates to the field of power supply terminal management, is used for solving the problem of lack of a technical scheme capable of simultaneously deconstructing a power supply operation effect in dynamic and instantaneous multi-dimension and multi-parameter angles in the prior art, and particularly relates to a safety monitoring method and system for a negative high-voltage power supply terminal of a thermionic cathode X-ray tube. Comprising a multi-source data monitoring module, a data slice analysis module, a dynamic series analysis module, an operation situation judgment module and an early warning output module. According to the method, the data is primarily processed in an edge calculation mode, the processed data is returned and then is further analyzed, edge and cloud collaborative processing is realized, data processing benefits are improved, analysis is carried out on two different dimensions including an instantaneous dimension and a dynamic dimension through different analysis modes, and the data processing efficiency is improved. And synchronous analysis is carried out on different parameters, so that operation safety monitoring analysis of different dimensions and different parameter angles is realized, and the comprehensiveness and accuracy of safety monitoring of the negative high-voltage power supply terminal are improved.

The invention provides an assembly tool and an assembly method for a hot cathode filament, the assembly tool comprises a half base and a welding pressing block tool which are symmetrically arranged left and right, the half base is provided with a filament groove and two pin limiting tables, the size of the filament groove is accurately matched with the diameter of the filament, and an annular step of a conductive pin is limited on the pin limiting tables; the welding pressing block tool comprises a first pressing block and a second pressing block, and the first pressing block is used for limiting the transverse position of the lamp filament; one end of an L-shaped convex block on the second pressing block presses the lamp filament in the lamp filament groove, and the other end of the L-shaped convex block reserves an enough space, so that the lamp filament can be welded conveniently; and the welding of the other welding end of the lamp filament is realized by exchanging the positions of the first pressing block and the second pressing block. According to the invention, the symmetrically arranged Haff bases effectively control the position and deformation of the lamp filament in the assembly process, the unique design of the welding pressing block tool limits the transverse and longitudinal movement of the lamp filament, the welding space is reserved, and the position accuracy and consistency of lamp filament assembly are remarkably improved.

The application discloses a radial electron beam staggered grid structure traveling wave amplifier, which comprises coaxial staggered grid leaves with different radii and made of metal at the lower side and the upper side of upper and lower metal ring shells, the lower side and the upper side of the grid leaves are staggered, and a cavity is formed between the lower side and the upper side of the grid leaves, thereby forming a slow wave structure. Electromagnetic waves are injected from the cavity between two adjacent grid leaves at the lower side of the upper metal ring shell or the upper side of the lower metal ring shell near a hot cathode through an input structure as a signal to be amplified, the electromagnetic waves are transmitted along the cavity in the coaxial staggered grid and interact with electron beams transmitted along the radial direction, thereby converting electron kinetic energy into electromagnetic wave energy, amplifying the input electromagnetic wave signal, and outputting the amplified electromagnetic waves from the lower metal ring shell or the upper metal ring shell through an output structure. The application has the characteristics of high interaction efficiency, high output power, high coupling impedance and simple structure.

The invention discloses an inverted magnetron which comprises a supporting heat dissipation assembly, a permanent magnet, a resonant cavity, an external cathode (a hot cathode or a cold cathode can be selected), an antenna and a power supply line. The supporting heat dissipation assembly is composed of a ceramic supporting piece, a heat dissipation copper shell, an anode heat conduction upper shell, an anode heat conduction lower shell, a cathode upper cover and a cathode lower cover which are coaxial, the ceramic supporting piece is fixed to the center of the heat dissipation copper shell, the cathode upper cover and the cathode lower cover are arranged at the upper end and the lower end of the heat dissipation copper shell respectively, and the anode heat conduction shell is externally connected with the heat dissipation copper shell and internally connected with the resonant cavity. The external cathode surrounds the inner side of the ceramic supporting piece, the two ends of the external cathode are connected with the cathode cover, and the resonant cavity is arranged in the external cathode and makes contact with the anode heat conduction shell. The antenna is led upwards from the resonant cavity, and the power supply line is connected with the cathode cover to supply power. According to the scheme, miniaturization of the resonant cavity is achieved through inverted layout, efficient heat dissipation and an axial uniform magnetic field are combined, high-power millimeter waves are stably output at low cost, and the resonant cavity is suitable for the fields of communication, radar and the like.

The invention discloses an ion flow measurement method and a measurement circuit for an extremely-high thermal cathode ionization gauge, and relates to the technical field of ion flow measurement, and the method comprises the steps: obtaining a demand range of ion flow measurement, and dividing the demand range into a first ion flow range and a second ion flow range; the ion flow measurement in the first ion flow range is completed through a preset first measurement mode, and the ion flow measurement in the second ion flow range is completed through a preset second measurement mode; measurement of electron currents of different measurement sections is achieved through the measurement circuit arranged based on the measurement method, the problem that in high vacuum measurement, a traditional ion current measurement circuit is poor in precision in ultrahigh measurement is solved, and the blank in ultrahigh vacuum measurement is filled.

A method for rejuvenation of a cathode in an electron-beam system is disclosed, wherein the cathode comprises an electron emitter embedded in a carbon guard ring, the method comprising: setting a pressure in a rejuvenation atmosphere surrounding the cathode to a rejuvenation pressure; and heating the cathode such that the carbon guard ring attains a rejuvenation temperature; wherein the rejuvenation pressure and the rejuvenation temperature are selected so that a rate at which material is removed from the carbon guard ring is higher than a rate at which material is removed from the electron emitter. Removal of material from the carbon guard ring is effected by a reaction between the carbon guard ring and a first gas comprised in the rejuvenation atmosphere. A method of operating an electron beam system involving such rejuvenation is also disclosed, as well as a computer program that when executed by one or more processors causes an X-ray source to perform the method.

The application discloses a kind of composite vacuum gauge circuit systems based on module multiplexing, the circuit system is configured as drivable vacuum sensor, vacuum sensor is Pirani sensor and hot cathode ionization sensor, circuit system includes: power supply circuit, filament heating circuit, adjustable high voltage circuit, ion current measurement circuit, voltage measurement circuit, analog-digital conversion circuit, wherein, single-chip microcomputer is configured as: starting Pirani sensor, control adjustable high voltage circuit and ion current measurement circuit are not enabled;Current vacuum degree is obtained based on Pirani sensor, if vacuum degree is greater than or equal to preset threshold, then continue to use Pirani sensor to measure vacuum degree;If vacuum degree is less than preset threshold, then enable adjustable high voltage circuit and ion current measurement circuit, and use hot cathode ionization sensor to measure vacuum degree.By the switchable circuit system controlled by single-chip microcomputer, the driving and measurement of two kinds of principle different vacuum sensors by a set of circuit system are realized.

The application discloses a kind of beam spot adjusting method and electron accelerator, the electron accelerator includes a anode potential adjusting device and an electron extraction device, the hot cathode of the electron accelerator is located on the electron extraction device, the beam spot adjusting method includes: obtaining the accelerating tube physical parameter of electron accelerator;According to the beam waist position of accelerating tube physical parameter calculation electron bunch;According to the control quantity of anode potential adjusting device obtained by beam waist position;The beam spot size of accelerating tube outlet is adjusted using the control quantity.The application can obtain the extraction electric field distribution, achieve the purpose of controlling beam envelope, so that the electron bunch safely reaches the outlet of electron accelerator, while controlling the potential difference between cathode and anode, realizing the dynamic adjustment of accelerator extraction port beam spot size within a certain range.

The invention relates to the technical field of vacuum measurement, in particular to a thermionic cathode ionization vacuum gauge for extraterrestrial space detection, which comprises a vacuum gauge wrapping cavity, an ionization chamber assembly and an emission chamber assembly, and is characterized in that a first interface of the vacuum gauge wrapping cavity is welded with an ionization chamber fixing flange; a second interface of the vacuum gauge wrapping cavity is welded with an emission cavity fixing flange; a third interface of the vacuum gauge wrapping cavity is a measurement interface and is communicated with the to-be-tested chamber; the ionization chamber assembly comprises an anode column sealing net, an anode column net and a collector; the emission chamber assembly includes an emitter, an emission electron suppression coating sheet, and an electron polymerizer. According to the invention, through physical isolation of the emitter and the ionization electrode, precision deviation caused by thermal deformation in the thermionic cathode emission process of the vacuum gauge is eliminated, and the influence of material deflation and thermal overflow effect caused by thermal effect on the measurement lower limit and the measurement precision in an ultrahigh vacuum state is fundamentally solved.

The present application relates to the technical field of gas cluster ion beam, and specifically discloses a gas cluster ion beam ionization source based on an electron focusing optical structure, which is used for generating a high-intensity gas cluster ion beam flow and comprises a hot cathode, a repeller, a focusing electrode and an electron accelerating electrode; the hot cathode is arranged at a predetermined position of the repeller and used for emitting an electron flow; the repeller, the focusing electrode and the electron accelerating electrode are arranged at predetermined positions and jointly constitute an electron beam focusing optical structure; the present application effectively solves the main problems existing in traditional gas ion sources through an innovative design, provides more stable and efficient gas cluster ion beam output, and has important significance for promoting the development of advanced processes, future technologies and other related fields of atomic-level manufacturing and processing.

The invention discloses an ultrahigh / extremely high thermal cathode vacuum gauge calibration and simulation integrated platform, which relates to the technical field of vacuum test instruments, and is characterized in that an ionization gauge sensing unit ball is connected with an air inlet flowmeter, a mass spectrometer and a comparison vacuum gauge, and an extremely high evacuation unit provides ultimate vacuum pressure for an ionization gauge sensing unit ball chamber; the pre-evacuating unit is used as a pre-evacuating pump after a to-be-tested thermionic cathode ionization gauge is replaced, the automatic parameter adjusting unit is used for providing continuous and adjustable electrical parameters, the electrometer is used for acquiring ion flow acquisition signals, and the mass spectrometer is used for providing a deflation rate and component analysis function. The comparison vacuum gauge and the air inlet flow meter form a calibration and simulation integrated platform flow detection and control unit, and the calculation unit serves as an intelligent control unit and provides algorithm processing, electrical parameter adaptation and data processing work for the calibration and simulation integrated platform. Through the calibration and simulation integrated design of the to-be-tested vacuum gauge, a real simulation environment is provided for development, optimization, iteration and shaping of the ultrahigh / extremely high thermal cathode vacuum gauge.

The invention belongs to the technical field of thermal barrier coatings, and particularly discloses a cold cathode EB-PVD double-layer composite functional homogeneous ceramic coating and a preparation method thereof. The coating is of a double-layer structure formed by homogeneous ceramics, the inner layer is a compact ceramic coating, and the outer layer is a traditional columnar ceramic coating. According to the preparation method, a cold cathode electron gun EB-PVD technology is adopted, and the coating is prepared and obtained. According to the preparation method, the limitation that a compact coating is difficult to prepare through traditional hot cathode EB-PVD is broken through, and the prepared coating has excellent corrosion resistance and thermal comprehensive performance and is particularly suitable for aero-engine hot end components in the marine environment.

The utility model discloses a kind of heat dissipation cathode suspension rod, it is related to metal smelting field, and its technical scheme main points are as follows: including electric conductor, electric conductor is cylindrical, several gas inlet pipes and the gas outlet pipe corresponding with gas inlet pipe are arranged in electric conductor, gas inlet pipe and gas outlet pipe are all detachably connected in the form of sliding on electric conductor, the outer wall of gas inlet pipe and gas outlet pipe is all with the inner wall of electric conductor, one gas inlet pipe corresponds with one gas outlet pipe, one end of gas inlet pipe is communicated with one end of gas outlet pipe by bending pipe, all bending pipes are located in the same side of electric conductor.The utility model adopts the heat dissipation mode of gaseous medium, realizes temperature control to suspension rod at low cost;Second is the modular detachable pipeline design, greatly improves maintenance convenience;Finally, the optimized combination of titanium alloy pipeline and copper silver electric conductor, multiple requirements of electric conduction, heat dissipation and corrosion resistance are considered.

An ion source for forming a plasma has a cathode having a cavity and a cathode surface defining a cathode step. A filament is disposed within the cavity. A cathode shield has a cathode shield surface that at least partially surrounds the cathode surface. A cathode gap is formed between the cathode surface and the cathode shield surface, defining a tortuous path for restricting the plasma from passing through the gap. The cathode surface may have a stepped cylindrical surface defined by a first cathode diameter and a second cathode diameter, which are different from each other to define the cathode step. The stepped cylindrical surface may be an outer surface or an inner surface. The first cathode diameter and the second cathode diameter may be concentric or axially eccentric.

The invention discloses a laser collimation device and method for a large-area hot cathode ion source, and belongs to the technical field of large-area ion sources, the device comprises a laser, a fixed bracket, an ion source base, a plurality of height-adjustable screw rods, a neutralization chamber, a limiter and a target; the laser is vertically installed on the front end face of the ion source base through the fixing support, and it is guaranteed that the laser emitting direction is perpendicular to the plane of the ion source base. Collimated laser emitted by the laser sequentially penetrates through the ion source base, the neutralization chamber and the limiter along the collimation central axis of the laser collimation device for the large-area hot cathode ion source, and finally irradiates the central area of a target; the ion source base, the neutralization chamber, the limiter and the target are all arranged along the same collimation central axis, and the collimation central axis corresponds to the beam axis direction of the large-area hot cathode ion source. According to the invention, the eccentricity degree of the ion beam and the collimation central axis can be accurately evaluated, the beam transmission deviation is effectively reduced, and the neutralization efficiency is improved.

The invention discloses a composite vacuum gauge circuit system based on module multiplexing, and the circuit system is configured to be capable of driving vacuum sensors, and the vacuum sensors are a Pirani sensor and a thermionic cathode ionization sensor. The circuit system comprises a power supply circuit, a filament heating circuit, an adjustable high-voltage circuit, an ion current measuring circuit, a voltage measuring circuit and an analog-to-digital conversion circuit, and the single-chip microcomputer is configured to start the Pirani sensor and control the adjustable high-voltage circuit and the ion current measuring circuit not to be started; the current vacuum degree is obtained based on the Pirani sensor, and if the vacuum degree is larger than or equal to the preset threshold value, the Pirani sensor continues to be used for measuring the vacuum degree; if the vacuum degree is smaller than the preset threshold value, the adjustable high-voltage circuit and the ion current measuring circuit are started, and the hot cathode ionization sensor is used for measuring the vacuum degree. Through a switchable circuit system controlled by a single-chip microcomputer, driving and measurement of two vacuum sensors with different principles by means of one circuit system are realized.

A preparation method of high-temperature hot cathode relates to the technical field of vacuum electron device manufacturing. Ammonium metatungstate, ammonium perrhenate, lanthanum nitrate and calcium nitrate are dissolved in water respectively, and then mixed into a clear solution. The solute is precipitated by water bath heating, dried in an oven, and then reduced in a hydrogen atmosphere to obtain a cathode precursor powder. The cathode precursor powder is sintered in a sintering furnace. During the working process of the cathode, the rare earth oxide can rapidly diffuse to the surface of the cathode, thereby supplementing the evaporation of the surface composition caused by high temperature and ensuring the stable release of electrons during the working process of the cathode. The noble metal rhenium has excellent chemical stability, less surface adsorbed gas, good ion bombardment resistance, good high-temperature mechanical properties, low evaporation rate, high resistivity, and can form a tungsten-rhenium alloy with the cathode matrix after being added, or rhenium-coated tungsten, thereby improving the overall emission performance of the cathode. After the addition of the alkaline earth metal, the evaporation of the active substances on the surface of the cathode can be reduced, and the surface ablation can be reduced, thereby improving the service life of the cathode.

The invention discloses a hot cathode ionization gauge filament driving circuit and a driving method, and relates to the technical field of vacuum measurement. The driving circuit comprises a vacuum gauge MCU, a DA chip, a power amplifier, a filament transformer and a filament voltage feedback circuit. The vacuum gauge MCU outputs a digital signal, the digital signal is converted into an analog voltage signal through the DA chip, and the analog voltage signal is amplified by the power amplifier and converted by the filament transformer to supply power to the filament; meanwhile, the filament voltage feedback circuit samples filament emission current and converts the filament emission current into a voltage feedback signal, the vacuum gauge MCU adjusts the effective time of the SW signal according to the voltage feedback signal, the on-off state of the power amplifier is controlled, and closed-loop control is achieved. The scheme does not need a large AC transformer, is high in integration level, retains AC driving, prolongs the service life of the filament, can accurately adjust the heating efficiency, and is suitable for various high-precision thermionic cathode ionization vacuum gauges.