234results about "Cathode ray concentrating/focusing/directing" patented technology

The utility model provides an X-ray tube cathode assembly tool and an X-ray tube, the tool at least comprises a filament welding tool, the filament welding tool is used for positioning a ceramic assembly and a filament assembly of a cathode assembly, and the filament assembly completes a preassembly process with the ceramic assembly on the filament welding tool; the lamp filament welding tool comprises a welding base, the welding base is provided with a first containing cavity concaved downwards from the surface of the welding base and an isolation part protruding from the surface of the welding base, the first containing cavity is used for containing and positioning a ceramic assembly, a groove is formed in the isolation part, and the groove is consistent with the lamp filament preassembly position of a lamp filament assembly. By adopting the assembly tool, the assembly position of the lamp filament can be accurately controlled, the concentricity of the lamp filament and the cathode focusing hole is ensured, the efficient assembly and welding of the cathode assembly are realized, the lamp filament assembly time is greatly shortened, and the production efficiency and the product performance are improved.

The utility model relates to the technical field of X-ray tubes, in particular to an X-ray tube with high-stability luminous flux, which comprises a tube shell, a cathode assembly, an anode assembly and a window assembly, and is characterized in that the anode assembly comprises an anode cap, an anode rod and an anode target assembly; the anode cap comprises an expansion part, a partition part and a necking part which are sequentially connected in the axial direction of the anode cap, the expansion part wraps the focusing piece from the bottom and the circumferential direction of the focusing piece, an electron beam incidence hole is formed in the partition part, and a packaging cavity extending in the axial direction and an X-ray outlet penetrating in the radial direction are formed in the necking part; the potential of the anode assembly is higher than that of the cathode assembly; along the axial direction of the X-ray tube, the distance H between the bottom of the focusing part and the top of the expansion part is greater than the distance D1 between the bottom of the focusing part and the partition part, so that stray electrons and secondary electrons generated by the stray electrons and overflow electrons and secondary electrons generated by the overflow electrons are absorbed after repeated back bombardment in the expansion part, and the secondary electrons are completely prevented from bombarding a tube shell, thereby improving the efficiency of the X-ray tube. And the high stability of the X-ray luminous flux is ensured.

The invention relates to a current control circuit, a focus control circuit and method of an electron beam and a medium. The current control circuit is connected with the magnetic field coil and used for driving the magnetic field coil to generate a target magnetic field; the current control circuit comprises a driving conversion unit and a controller. The driving conversion unit comprises a plurality of cascaded switching tube circuits, and the input end of each switching tube circuit is connected with a corresponding bus voltage source; the output end of the driving conversion unit is connected with the magnetic field coil; and the controller is connected with the driving conversion unit and controls the output of each switching tube circuit in the driving conversion unit so as to control the characteristics of the current output to the magnetic field coil by the driving conversion unit. The current control circuit can meet the requirements of control efficiency and universality at the same time.

The invention relates to a micro-focus CT bulb tube based on a laser trigger cathode and quadrupole magnetic focusing and a working method of the micro-focus CT bulb tube, which are applied to the technical field of CT bulb tubes and comprise a vacuum tube shell, a gallium nitride cathode system arranged in the vacuum tube shell, a laser trigger system, a quadrupole magnetic focusing system, a rotating target structure and a ray window, by adopting the gallium nitride annular cathode film and the laser trigger system, an electron emission mechanism with low power consumption and high response rate is realized; by arranging a quadrupole magnetic focusing structure, the focus position and size of the electron beam are effectively controlled; the rotary tungsten-rhenium target disc is used for enhancing the thermal load bearing capacity and improving the X-ray yield; the high vacuum environment and the dynamic thermal modeling feedback strategy are combined, the technical problems of a traditional micro-focus CT bulb tube in response speed, focus stability and thermal management are solved, the imaging resolution and the system reliability are remarkably improved, and the method is suitable for the field of high-precision medical and industrial nondestructive testing.

The invention relates to a field effect emitter microstructure, an electron emitter device, an X-ray tube and a method for generating X-rays by means of an X-ray tube. The field effect emitter microstructure comprises an emitter needle, a gate electrode with a gate opening, the gate opening connects the lower side and the upper side of the gate electrode, and the longitudinal central axis of the emitter needle is vertical to the gate electrode in the emission direction and is aligned with the gate opening; a first insulating layer in which free electrons can be generated by means of an emission voltage that can be applied between the gate electrode and the field-effect emission section, the field-effect emitter microstructure being characterized in that a second insulating layer, the lower side of which adjoins the upper side of the gate electrode at least in part, is provided, and an electrically conductive focusing layer, the focusing layer being provided in which the free electrons can be generated in the field-effect emission section by means of an emission voltage that can be applied between the gate electrode and the field-effect emission section. The upper side of the second insulating layer is at least partially adjacent to the lower side of the focusing layer, and the second insulating layer and the focusing layer each have a through-opening for free electrons that can be generated in the field-effect emission section.

An X-ray source device includes an anode and an electron beam cathode system arranged to emit a plurality of electron beams therefrom toward the anode. A deflector device is disposed adjacent to the electron beam cathode system to manipulate interaction of one or more of the electron beams emitted by the electron beam cathode system with the anode. An associated method of forming an X-ray source device is also provided.

A system includes a stage for supporting a sample having at least first and second atomic elements. The first atomic element has a first characteristic x-ray line with a first energy and the second atomic element has a second characteristic x-ray line with a second energy, the first and second energies lower than 8 keV and separated from one another by less than 1 keV. The system further includes an x-ray source of x-rays having a third energy between the first and second energies and at least one x-ray optic configured to receive and focus at least some of the x-rays as an x-ray beam to illuminate the sample.

The invention discloses an annular focus electron beam focusing device and method, and belongs to the field of energy, aerospace, material analysis and high-energy physics. The annular focus electron beam focusing device comprises a cathode assembly, a focusing electrode assembly and an anode target which are sequentially arranged in the electron beam propagation direction; the cathode assembly comprises a lamp filament; the focusing electrode assembly at least comprises a focusing electrode and a focusing cover, the focusing electrode is provided with a supporting part used for fixing a filament, the supporting part is movably connected with the focusing electrode, and then the assembling height of the filament is changed; the focusing cover covers the focusing electrode in a matched mode, and the focusing electrode is provided with a positioning part used for positioning the focusing cover in the axial direction. By replacing the lamp filaments with different ring diameters and / or adjusting the assembly height of the lamp filaments, the electron beams converge on the bombardment surface of the anode target to form the annular focus with the preset size, a basis is provided for adapting to the annular focuses with different sizes, and the flexibility and the application range of equipment are greatly improved.

A method for detecting perturbations in electron impinging on an X-ray source is disclosed. The method comprises: controlling an electron beam to point to an expected target location on a stationary target and form a spot at the expected target location such that the electron beam forms a spot at an actual target location on the target, the target comprising a first edge between regions having different electron back scattering probabilities; measuring a first series of values indicative of a change in current absorbed in the target over time with the electron beam spot directed at the expected target location and overlapping the first edge, where the expected target location remains stationary while measuring the first series of values; and calculating a first quality metric indicative of perturbations in a relative position between the expected target position and the actual target position based on the first series of values. An alternative method of scanning an electron beam across the edge, and an X-ray source configured to perform these methods, are also disclosed.

A radiation system includes an X-ray target configured to convert an electron beam into an X-ray beam. The X-ray target includes a plurality of target layers and each of the plurality of target layers are configured to convert a portion of the electron beam into a portion of the X-ray beam.

To remove all unwanted heat from a source coil.SOLUTION: An electron beam B is typically dynamically steered on its path to a target 500 after generation. The steering is performed by one or more source coils 132N and 132S. These coils create a magnetic field outside a vacuum vessel 112 and allow air / water / oil cooling to remove unwanted heat. The magnetic field is then picked up within the vacuum vessel with a pole piece and directed toward a region where the magnetic field is needed to steer the electron beam.SELECTED DRAWING: Figure 1

An electron gun includes a cathode including an electron emitting portion, an extraction electrode for extracting electrons emitted from the electron emitting portion, and a focusing electrode for focusing the electrons extracted by the extraction electrode. The focusing electrode includes an outside electrode having a tubular shape, and an inside electrode arranged inside the outside electrode. The inside electrode defines a first space having a columnar shape, and includes a first surface on a side of the cathode, and a second surface on an opposite side of the first surface. An inside surface of the outside electrode and the second surface of the inside electrode define a second space. The inside electrode includes an electron passage hole, and a communicating portion which makes the first space and the second space communicate with each other.

The utility model discloses a cathode focusing cover, an X-ray tube and an X-ray imaging device, the cathode focusing cover is used for focusing an electron beam emitted by an electron emitter, the cathode focusing cover comprises a body, a first focusing groove is limited on the body, a second focusing groove is limited on the bottom surface of the first focusing groove, and the first focusing groove is communicated with the second focusing groove. The second focusing groove is used for accommodating the electron emitter, a notch communicated with the first focusing groove is defined in the edge, extending in the emitting direction of the electron beam, of the first focusing groove, and the notch is used for changing the size parameter of a focal spot formed by the electron beam in the set direction. According to the cathode focusing cover provided by the embodiment of the utility model, the notch is formed in the edge of the first focusing groove, so that the size adjustment of a focal spot in a set direction can be realized under the condition that the diameters of a ray tube and the cathode cover are not changed.

In order to achieve effective cooling, an X-ray emitter with a tube housing having a vacuum is provided. At least one anode is arranged in the tube housing, such that the anode is irradiated by an electron beam generated in a cathode and accelerated through an electrical field. The anode is excited, such that an X-ray deceleration radiation is emitted. The X-ray emitter has a thermoelectric converter (e.g., at least one thermophotovoltaic cell) for generating electrical energy. The thermoelectric converter is arranged, such that the thermoelectric converter may be irradiated at least in part by a heat radiation emanating from the anode.

The application provides an X-ray tube cathode assembly assembling method, a tool and an X-ray tube. The method comprises the following steps: S100: pre-positioning a filament and a pin, so that the filament and the pin reach an assembling distance, to obtain a pre-assembled filament assembly; pre-positioning the filament assembly and a ceramic assembly and assembling the filament assembly to the ceramic assembly; S200: inspecting and adjusting the filament concentricity of the pre-assembled filament assembly, so that the concentricity is consistent with a cathode focusing electrode to be assembled; S300: assembling the cathode focusing electrode to the filament assembly whose concentricity has been adjusted, to obtain a cathode assembly in which the filament is concentric with the cathode focusing electrode. By using the assembling method and the tool, the assembling position of the filament can be accurately controlled, the concentricity of the filament and the cathode focusing hole is ensured, efficient assembly and welding of the cathode assembly are realized, the filament assembling time is greatly shortened, and the production efficiency and product performance are improved.

Some embodiments include a system comprising: a plurality of x-ray sources, each x-ray source comprising: an electron source configured to generate an electron beam; and a target configured to receive the electron beam and convert the electron beam into an x-ray beam; wherein: a first x-ray source in the x-ray sources is different from a second x-ray source in the x-ray sources; and the target of the x-ray source is part of a linear target.

The invention relates to a system for converting an electron beam into a photon beam, the system comprising: an electron accelerator (1) configured to generate an electron beam (10) of accelerated electrons along an irradiation axis (Z), a scanning unit (2), a focusing unit (3) for forming a focused beam (10f) converging towards a first focus point (Fx) located on the irradiation axis (Z), a conversion unit (4) located between the focusing unit (3) and the first focus point (Fx) and comprising one or more bremsstrahlung converters (4 .1‑4.n), the one or more bremsstrahlung converters being configured to convert the focused beam (10f) into a photon beam (11x), a target holder (5h), the target holder being configured to hold a target (5), characterised in that the one or more bremsstrahlung converters (4.1‑4.n) are curved so that an intersection angle (α) at ​​which the focused beam (10f) intersects each of the one or more bremsstrahlung converters (4.1‑4.n) is between 65° and 115° at all points, preferably between 75° and 105° at all points.

The invention discloses a quantitative electron beam axis combination system for X-ray imaging, and relates to the technical field of transmission electron microscope atomic scale in-situ mechanics. Comprising an anode, a first coil, a second coil, a fourth connecting piece, a flange and a shell, the flange and the fourth connecting piece are each of an axisymmetric structure, the flange is fixedly connected to the shell, the fourth connecting piece is arranged in the flange, the first coil is wound around the top of the fourth connecting piece, and the second coil is wound around the bottom of the fourth connecting piece; the first coil and the second coil are electrically connected with an external power source, a fourth electron channel is arranged in the center of the fourth connecting piece, and electron beams emitted by the electron gun complete axis combination under the action of the first coil and the second coil when passing through the fourth electron channel. In the electron beam excitation process, different axis combination types and axis combination angles can be corrected, and the relation between the coil current size and coil configuration and the excitation magnetic field size and the relation between the deflection angle and the coil current size during axis combination are fundamentally established.

A field emission cathode device includes a cathode element having a field emission surface and an adjacent gate electrode element defining a first gap therebetween. A gate voltage applied to the gate electrode element causes the field emission surface to emit electrons that are accelerated through the gate electrode element. The gate electrode element is disposed between the cathode element and an anode element, the anode element having an anode voltage applied thereto to attract the electrons emitted through the gate electrode element. A tuning electrode element is disposed between the gate electrode element and the anode element. The tuning electrode element has a tuning voltage applied thereto to decelerate the electrons directed through the gate electrode element and to direct the electrons therethrough toward the anode element. An associated method of forming a field emission cathode device is also provided.

An x-ray illumination system for use in x-ray based metrology of a sample, the x- ray illumination system includes x-ray energy adjustable optics that comprises a plurality of subsets of one or more x-ray optical elements, different subsets are associated with different x-ray energies out of multitude of selectable and monochromatic x-ray energies; wherein the x-ray energy adjustable optics is arranged to (a) receive an input x-ray beam that is polychromatic or partially monochromatic, and (b) generate a focused monochromatic x-ray beam having a selected x-ray energy, using a selected subset that is associated with the selected x-ray energy, the selected x-ray energy belongs to the multitude of selectable and monochromatic x-ray energies.

To provide an X-ray generator which can suppress displacement of a circuit part in an insulating part.SOLUTION: An X-ray generation device 1A includes a housing 2, an electron gun 3, a target 4, a power supply unit 6, a power feeding unit 7, and a fixing member 8 having at least one of an insulating first fixing member 81 and an insulating second fixing member 82. The power supply unit 6 includes a solid insulating part 61 and a circuit part 62 embedded in the insulating part 61, and the circuit part 62 includes a first voltage part 62a, a boosting part 62b, and a second voltage part 62c. The first fixing member 81 is embedded in the insulating part 61, is fixed to the circuit part 62, and reaches a surface 61a of the insulating part 61. The second fixing member 82 is embedded in the insulating part 61, is fixed to each of the circuit part 62, and the power feeding unit 7.SELECTED DRAWING: Figure 1

An x-ray FLASH radiotherapy device uses an electron beam to generate x-rays on a target element. The focal area on the target element is about 1 to about 12 cm2. The target element is separated from a radiotherapy patient by a thin aerogel insulator. Using about 50 to 200 kV of power, the x-ray FLASH radiotherapy device administers 40 Gy / s of radiation or more during short bursts or pulses of one second or less. Due to the short duration of these pulses, heating of the target element is limited, thereby reducing the source to surface distance between the radiation source and the patient.

An X-ray source is disclosed, comprising: an electron source configured to provide an electron beam; an aperture configured to limit the angular distribution of the electron beam; a secondary emission limiting aperture configured to limit the angular distribution of the secondary X-ray emission, wherein the electron beam causes secondary X-ray emission to be emitted from a region surrounding the aperture; a first deflector located downstream of the electron beam limiting aperture and configured to deflect the electron beam toward the secondary emission limiting aperture; a target located downstream of the secondary emission limiting aperture and configured to generate primary X-ray emission through interaction with the electron beam; and an exit window located to transmit the primary X-ray emission, wherein the secondary emission is prevented from reaching the exit window by the secondary emission limiting aperture. A corresponding method is also disclosed.

The present invention provides an X-ray tube focus automatic positioning device, comprising: a controller, an XY-axis moving platform, a Z-axis moving platform, an X-ray tube installed on the XY-axis moving platform, and a detector and a collimator installed on the Z-axis moving platform. The XY-axis moving platform includes an X-axis motor and a Y-axis motor for adjusting the X-ray tube to find the focus position. The Z-axis moving platform includes a Z-axis motor for moving the detector up and down to facilitate the disassembly and assembly of the X-ray tube. The controller controls the X-axis motor, Y-axis motor, and Z-axis motor in the following manner to achieve automatic positioning of the X-ray tube focus. The XY-axis motors can be controlled by the controller to move the X-ray tube. At the same time, based on the data sampled by the detector, it is determined whether the line connecting the focus of the X-ray tube and the center point of the hole of the collimator is perpendicular to the flange plane of the X-ray tube, forming a closed-loop feedback control system.

The utility model relates to a cathode device and an X-ray tube. The cathode device for the X-ray tube is provided with a focusing head and an electron emitter, high voltage can be applied between the focusing head and the electron emitter, the focusing head is provided with at least one emitter well, the electron emitter is centrally arranged above the emitter well or in the emitter well, and the electron emitter is arranged in the emitter well. -wherein an emitter well taper is formed as part of the focusing head such that the width of the emitter well over the height of the electron emitter is smaller than the width below the emitter well taper,-wherein the varying cross-section of the emitter well is configured to reduce the Coulomb force acting on the electron emitter as a result of the applied high pressure.

In some embodiments, an apparatus for generating a radiation, such as X-rays, includes an emitter, such as an electron gun, of a beam of charged particles; a target, such as an anode, extending a length along a target trajectory that includes at least a curved segment and including a material adapted to emit a radiation, such as X-rays, upon the charged particles impinging on the target; and a scan tube attached to the emitter and enclosing the target. The target has multiple portions, some of which being disposed closer to the emitter than other portions. The apparatus may further include two control components. The first component includes one or more magnets for guiding the charged particle along the target without impinging on it; the second component includes one or more magnets for deflecting the guided charged particles to impinge upon the target at different locations over time.

The invention discloses a magnetic quadrupole lens, an X-ray bulb tube and a method for focusing and femtofocusing an electron beam. The magnetic quadrupole lens comprises a frame iron core; the four magnetic pole assemblies are arranged on the inner periphery of the frame iron core and used for generating a focusing magnetic field for focusing the electron beams and a femtofocus magnetic field for performing femtofocus on the electron beams. The magnetic pole assembly comprises a main pole arranged on the inner periphery of the frame iron core and extending towards the center of the frame iron core; the first focusing coil sleeves the main pole and is used for generating a first focusing magnetic field for focusing the electron beam; and the first femtofocus coil sleeves the main pole and is used for generating a first femtofocus magnetic field for performing femtofocus on the electron beam. Wherein the first femtofocus coil is closer to the frame core than the first focus coil.