22 results about "Electron collision" patented technology

The invention discloses a plasma sheath electromagnetic characteristic simulation method and system for a hypersonic flight vehicle, and the method comprises the steps: carrying out the fluid simulation according to the geometric shape and flight parameters of the hypersonic flight vehicle, so as to obtain the information of a flow field containing a plasma sheath region; according to the flow field information, simulation parameters of all positions of the plasma sheath space are determined, and the simulation parameters at least comprise electron density distribution and electron collision frequency distribution; based on the simulation parameters, a three-dimensional model of the plasma sheath is established, the three-dimensional model is layered according to electron density distribution, a layered three-dimensional model composed of a plurality of plasma layers is formed, and each plasma layer has the electron density within a preset range; based on the layered three-dimensional model, establishing a non-uniformly distributed electromagnetic simulation model of the plasma sheath; and carrying out grid division on the non-uniformly distributed electromagnetic simulation model, and carrying out numerical calculation by adopting a numerical solver so as to obtain the electromagnetic characteristics of the plasma sheath. According to the method, the problem of deviation between a simulation result and an actual situation of a traditional simulation model can be solved.

An arc thruster with a combined emitter and cathode structure belongs to the field of space electric propulsion. This invention addresses the short lifespan and complex structure of existing arc thrusters. The invention comprises a tantalum tube, a heating unit, an emitter, and a tungsten electrode. The emitter and tungsten electrode are coaxially nested and mounted at the top of the tantalum tube's inner cylinder. The emitter's sleeve is coaxially disposed within the barrel of the tungsten electrode, forming an annular gas space between the sleeve and barrel. The heating unit heats the emitter to above 1500°C, generating thermal emission seed electrons within the emitter's grooves. These electrons fly out through the small holes in the tungsten electrode, colliding with the swirling outflowing gas from the side of the tungsten electrode, triggering an electron avalanche and achieving arc discharge between the cathode and anode. Electrons continuously generated by the emitter, under the action of the cathode and anode electric fields, reach the anode, establishing a continuous arc discharge between the cathode and anode, ultimately achieving ignition of the arc thruster.

An atmospheric pressure electron impact ionization mass spectrometer system includes an atmospheric pressure ionization component operated at an atmospheric pressure. An electron impact ionization mass spectrometer includes an electron ionization source. An atmospheric pressure interface operates below about 10 Torr. The atmospheric pressure interface includes a source block to focus a plurality of molecules and ions from the atmospheric pressure ionization component at the atmospheric pressure into the electron ionization source which operates at a pressure below about 10-3 Torr.

The invention discloses a gallium oxide-based transverse FinFET (FinFET) device with high electron mobility, which mainly solves the problems of small channel mobility and large on-resistance and thermal resistance effects of the existing similar devices. The device comprises a substrate (1), a barrier layer (2) and a channel layer (3) from bottom to top, the channel layer (3) adopts a Fin structure, a source electrode (4) and a drain electrode (5) are respectively arranged at two ends of the channel layer (3), and a gate dielectric layer (6) and a gate electrode (8) are arranged between the source electrode and the drain electrode; a magnetic thin film layer (7) is arranged on the gate dielectric layer corresponding to the groove between the Fin channel layers and is used for providing magnetic field force in a channel and applying Lorentz force from bottom to top to moving electrons, so that the channel electrons perform directional movement under the synergistic effect of the Lorentz force and the electric field force, the probability of electron collision and scattering is reduced, and the performance of the device is improved. And the carrier mobility of the device is improved. Under the condition that the process complexity is not increased, the on resistance and the thermal resistance effect of the device can be effectively reduced, and the device can be used as a power electronic device.

This invention discloses a method for detecting the vacuum degree of a circuit breaker based on electron collision radiation inversion, belonging to the field of power equipment testing. The method includes the following steps: Step S1, synchronously acquiring X-ray pulse signals from multiple measuring points outside the arc-extinguishing chamber of the vacuum circuit breaker, extracting and parameterizing the pulse events to obtain the temporal distribution characteristics reflecting electron collision behavior; Step S2, establishing a feature enhancement model based on electron collision probability; Step S3, establishing a mapping model between the X-ray generation mechanism and the electron collision process, and then inverting the vacuum degree. This invention provides a method for detecting the vacuum degree of a circuit breaker based on electron collision radiation inversion. By establishing a physical mapping relationship between the statistical characteristics of X-ray pulse events and the electron mean free path and collision probability, it achieves quantitative inversion of the vacuum degree, thereby improving detection accuracy and physical interpretability.

The invention discloses a C4F7N / CO2 mixed gas 50% lightning impulse voltage prediction method and device, electronic equipment and a storage medium, and belongs to the field of high-voltage insulation, and the method comprises the steps: obtaining the electron collision cross section, ion transport parameters, electrode gap and electrode type data of mixed gas, and constructing a two-dimensional electrode model; processing the electron impact cross section to obtain electron average energy, mobility, diffusion coefficient and reaction rate; solving a charged particle continuity equation and a Poisson equation by combining the parameters to obtain electric field intensity distribution and a streamer head position; and determining the initial voltage of the stream according to the corresponding externally applied voltage when the electric field intensity is maximum, determining the breakdown voltage of the stream according to the externally applied voltage before the head of the stream reaches the ground electrode, and calculating to obtain a predicted value of the lightning impulse voltage. According to the invention, the problem of lightning impulse voltage prediction failure caused by the fact that the streamer starting voltage and the streamer breakdown voltage cannot be accurately extracted in the prior art can be solved.

Determining operational parameters of a spectrometer comprising an electron impact ion source. In ON and OFF mode respectively there are a first and a second set of operational parameters The first an

Disclosed in the present invention are a correction method and apparatus for an electron collision reaction rate, and a device and a medium. The method comprises: performing calculation on the basis of a Boltzmann equation corresponding to the electron distribution in a six-dimensional phase space, so as to obtain the electron energy distribution in the six-dimensional phase space, and then performing calculation on the basis of the electron energy distribution, so as to obtain electron collision reaction coefficients; on the basis of a preset Poisson equation and a preset particle transport equation, performing calculation to obtain the electric-field distribution and electron density in the six-dimensional phase space; on the basis of the electric-field distribution and the electron density, obtaining a corresponding electron energy transport equation, obtaining, on the basis of the electron energy transport equation, an electron energy loss balance in an inelastic collision process, and then obtaining a correction coefficient for an electron collision reaction rate; and on the basis of the correction coefficient for the electron collision reaction rate and the electron collision reaction coefficients, obtaining a corrected electron collision reaction rate. By means of the present invention, an electron collision reaction rate can be corrected.

The present disclosure relates to a physical vapor deposition device and method, which comprises a reaction chamber, a first magnetron assembly, a support part and a second magnetron assembly. The top of the reaction chamber is provided with a target material. The first magnetron assembly is arranged on the back of the target material. The second magnetron assembly is arranged on the back of the support part. When the first magnetron assembly works, a magnetic field is generated at the target material, so that the positive ions of the plasma are attracted by the cathode negative electricity, hit the target material, knock out the atoms of the target material, and deposit on the substrate to obtain a film layer. In addition, the magnetic field lines generated by the second magnetron assembly when working are complementary to the magnetic field lines generated by the first magnetron assembly. Not only can the electron collision probability be further increased and the deposition rate be improved, but also the electron distribution trajectory can be changed, so that the magnetic field intensity of each part of the target material is relatively uniform. In this way, the thickness uniformity of each position of the target material is good, thereby the utilization rate of the target material can be improved, the service life of the target material can be prolonged, and the cost can be reduced.

The atmospheric pressure electron impact ionization mass spectrometer system includes an atmospheric pressure ionization component operated at atmospheric pressure. The electron impact ionization mass spectrometer includes an electron ionization source. The atmospheric pressure interface operates at less than about 10 Torr. The atmospheric pressure interface separates the plurality of molecules and ions from the atmospheric pressure ionization component at atmospheric pressure. -3 It includes a source block for focusing into an electron ionization source that operates at pressures below Torr.

The present disclosure relates to an X-ray generating apparatus capable of providing an X-ray image and an X-ray system using the same, including: a field emitting part having a plurality of electron beam emitting regions arranged; an X-ray generating part generating X-rays by collision with electrons emitted from the field emitting part; and, a collimator transmitting X-rays generated from the X-ray generating part in a specific direction, in which a plurality of through-holes are arranged on the collimator to transmit the X-rays in a specific direction, and the X-ray can be blocked in a region other than the through-hole.

The application relates to a kind of optically pumped metastable noble gas lasers using laser-induced preionization, wherein a sample cell is arranged inside a noble gas metastable preparation chamber, a radio frequency electrode and a grounded electrode are arranged inside the noble gas metastable preparation chamber, the sample cell is arranged between the radio frequency electrode and the grounded electrode, a pump light source and a preionization light source are arranged outside the noble gas metastable preparation chamber, and the pump light source and the preionization light source are arranged to emit light perpendicularly and orthogonally to the sample cell, a first mirror is arranged between the pump light source and the noble gas metastable preparation chamber, a second mirror is arranged on the side of the noble gas metastable preparation chamber away from the pump light source, a lens is arranged between the preionization light source and the noble gas metastable preparation chamber, and a heating device is arranged outside the noble gas metastable preparation chamber. The application can quickly generate high-concentration metastable atoms based on laser-induced preionization and electron collision accelerated by an external electric field, and can directly avoid the problem of serious electromagnetic interference caused by the generation of metastable atoms in the traditional discharge mode at the mechanism level.

The invention provides an electron collision ion source for a time-of-flight mass spectrometer, and the electron collision ion source comprises an electron gun which is used for generating and emitting electrons; a through hole is formed in the center of the accelerating electrode and is used for accelerating electrons; a through hole is formed in the center of the modulation electrode and is used for adjusting the divergence of the electron beam; an opening for receiving electrons is formed in one side of the ionization chamber, and the ionization chamber is used for limiting the beam diameter of the high-energy electron beam, realizing vaporization and ionization of sample molecules or atoms and storing ionization products; the centers of the insulating sheets are provided with through holes, and the insulating sheets are used for forming insulating layers among the electron gun, the accelerating electrode, the modulation electrode and the ionization chamber; and the accelerating electrode, the modulation electrode, the holes in the centers of the plurality of insulating sheets and the holes for receiving electrons in the ionization chamber are coaxial. The device has the advantages of outputting collimated electron beams, and being small in size, low in power consumption, large in current, simple in structure, easy to assemble and suitable for resource constraint requirements of deep space exploration or portable mass spectrometers.

The present invention provides a method and device for modeling pulse arc plasma based on high-speed images. The method includes: collecting pulse arc image data, voltage and current; calculating the brightness center position and pulse arc calculation matrix; gridding the pulse arc and obtaining a three-dimensional distribution of pulse arc plasma density; calculating the electron migration speed of each horizontal layer; calculating the three-dimensional distribution of conductivity and obtaining the three-dimensional distribution of electron collision frequency and electron temperature; calculating the total energy of pulse arc particles and the total macroscopic energy of pulse arc ， When the difference between the total energy of the particles and the total macroscopic energy meets the convergence condition, the modeling is completed. This solution has a simple modeling method, more realistic and effective model parameters, and is time-varying, making it widely applicable.

The invention relates to the technical field of laser emission propellers, in particular to a motor Weishi-Qi-Nu-Pu interstellar laser communication ion trap laser emission propeller, which is characterized in that a stored propellant collides with electrons under the action of high voltage through a plasma former to form a plasma flow, and the plasma flow is subjected to ionization acceleration; according to the invention, laser and plasma are combined to form a high-energy high-speed particle flow, then the high-energy high-speed particle flow is ejected at a high speed to generate a reaction thrust so as to push the rocket to move, and the laser and the plasma are combined to provide propelling power with high specific impulse, high efficiency and long service life for a rocket detector. Therefore, the technical problems that a launching propeller used by an existing rocket propelling system adopts chemical fuel to drive a rocket to lift off, the launching cost is high, the load is low, and the launching operation running mode is complex are solved.

PURPOSE: To provide a device capable of suppressing a backflow of cations, which are generated by collision of electrons after passing an opening of an anode electrode, to a cathode.CONSTITUTION: An electron gun 201 comprises: a cathode 10 which emits an electron beam; an anode 14 which includes a face opposed to the cathode, in which a first opening through which the electron beam emitted from the cathode is passed is formed on the face and at least one second opening is formed on the same face as that on which the first opening is formed and at a position different from the first opening and which is retained at a potential of a positive side in relative to a potential of the electron beam; a restriction aperture substrate 16 which is disposed on a downstream side of the anode electrode in a direction of travel of the electron beam, in which a third opening is formed through which the electron beam is passed, and which restricts the passage of a part of the electron beam; and a Wehnelt 12 which is disposed between the cathode and the anode and to which a potential of a negative side in relative to the potential of the anode is applied.SELECTED DRAWING: Figure 5

A method for detecting disturbances in an electron impact X-ray source is disclosed. The method comprises controlling an electron beam so as to be directed toward an intended target position on a stationary target and to form a spot at the intended target position, wherein the electron beam thereby forms a spot on the stationary target at the actual target position, the stationary target having a first edge between regions of different electron backscattering probabilities, and measuring a first set of values ​​indicating the current absorbed in the stationary target as a function of time, with the electron beam spot directed toward the intended target position and overlapping the first edge, wherein the intended target position is kept stationary while measuring the first set of values, and calculating a first quality measure indicating disturbance at the relative position between the intended target position and the actual target position based on the first set of values. An alternative method in which the electron beam is scanned across the edge and an X-ray source configured to perform the method are also disclosed.

The invention provides an electron impact ion source that is adapted for use in a Time- of-Flight mass spectrometer device, and in particular for use in a Multiple-Reflection TOF mass spectrometer device. The proposed solution avoids background noise in captured spectra and ensures high sensitivity and mass resolution.

Provided are a radiation tube (60) and a radiation source that have a smaller size than those in the related art. A radiation tube that is used in a radiation source for radiography includes: an electron emitting unit (72) that includes a cathode unit (90) having an emitter electrode (91) which emits electrons and a gate electrode (96); an anode unit (74) that has an anode surface (75) facing the cathode unit and collides with the electrons to generate radiation; a constant voltage supply unit (70) that supplies a constant driving voltage to the gate electrode; and a vacuum tube (76) that accommodates the constant voltage supply unit, the electron emitting unit, and the anode unit.

The invention discloses a plasma nitrogen fixation method and device based on a transition metal-based oxide catalyst, and belongs to the technical field of energy and environment, the plasma nitrogen fixation method comprises the following steps: placing the transition metal-based oxide catalyst in a plasma reactor; introducing nitrogen-containing gas into the plasma reactor, and activating the nitrogen-containing gas into nitrogen oxide under the action of plasma and the transition metal-based oxide catalyst; nitrogen oxides are introduced into an alkali solution for absorption. The plasma is utilized to directly crack N2 and O2 through high-energy electron collision to generate active nitrogen / oxygen species, and the transition metal-based oxide catalyst is combined to promote N2 dissociation, so that the high-temperature and high-pressure limitation of the traditional Harber method is overcome, nitrogen fixation at normal temperature and normal pressure is realized, and the energy consumption potential is lower.

A transmission-type X-ray source is disclosed, comprising an electron source for providing an electron beam; a target configured to generate X-ray radiation by interaction with the electron beam; an X-ray transparent exit window; a plurality of electron beam limiting apertures, each configured to limit an angular distribution of the electron beam; a secondary radiation limiting aperture; a first deflector arranged to deflect the electron beam from the secondary radiation limiting aperture towards the target; a second optional deflector arranged to deflect the electron beam from a selected one of the electron beam limiting apertures towards the secondary radiation limiting aperture; and an aperture selector configured to make the selected one of the electron beam limiting apertures and the electron beam path coincide; wherein each of the electron beam limiting apertures and the secondary radiation limiting aperture are arranged so that there is no direct line of sight for secondary X-ray radiation from the electron beam limiting apertures to the exit window. The aperture selector may comprise a third deflector arranged to deflect the electron beam towards the selected one of the electron beam limiting apertures, or an actuator arranged to bring the selected one of the electron beam limiting apertures into the electron beam path.

The application discloses a vacuum surface flashover simulation method based on a non-uniform triangular mesh and a related device, and belongs to the field of finite element simulation. The method comprises the following steps: constructing and initializing an electric field simulation domain, and dividing a non-uniform triangular mesh which is dense near a dielectric surface and sparse far from the dielectric surface; injecting seed electrons at a cathode three-combination position and updating particle positions; simulating an electron collision process by using a Monte Carlo method, and determining the number and speed of various particles; distributing the particles to the triangular mesh, calculating a weight coefficient and a charge density, and updating a potential and an electric field intensity; and iterating the above steps until a simulation condition is met. The method breaks through the limitation of a traditional rectangular mesh, can be adapted to complex boundaries such as grooves and roughening, can comprehensively simulate all stages of flashover such as field emission, secondary electron emission, gas desorption and ionization, can reduce numerical errors and improve simulation reliability, can provide theoretical guidance for new insulation design and protection, and can make up for the limitation of the prior art which only focuses on the initial stage of flashover.