249results about "Cathode ray concentrating/focusing/directing" patented technology

An x-ray source includes an x-ray transmissive window having an x-ray transmittance greater than or equal to 20% for at least some x-rays having an x-ray energy less than 1 keV. The x-ray source further includes an electron source configured to generate at least one electron beam and an anode assembly configured to generate x-rays in response to electron bombardment by at least some of the electrons of the at least one electron beam from the electron source. The x-ray source further includes at least one x-ray optic is configured to receive at least some of the x-rays from the anode assembly and to direct at least some of the received x-rays to the window to form an x-ray beam.

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 invention relates to an X-ray tube, an X-ray focus adjusting method and CT equipment. The X-ray tube comprises a flat cathode, a focusing electrode, a vacuum closed shell and a beam adjusting assembly. The flat cathode is used for emitting direct-current electron beams; the focusing electrode surrounds the periphery of the flat cathode, forms an angle with the plane where the flat cathode is located, and is used for focusing the direct current electron beam; the vacuum closed shell is provided with a beam channel arranged on one side of the beam outlet direction of the plate cathode, an inlet of the beam channel and the plate cathode are arranged at an interval, and the beam channel is used for direct current electron beams to pass through; the beam adjusting assembly comprises a solenoid arranged on the periphery of the beam channel, and the solenoid is used for focusing the direct current electron beam passing through the beam channel. When the plate cathode emits an electron beam, the focusing electrode focuses the electron beam for the first time. And the solenoid performs secondary focusing. The electron beam is focused twice, so that the focusing force in one focusing process can be smaller, and the uniformity of the electron beam in the transmission process is better.

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.

To provide an X-ray generation device capable of avoiding a damage of a target even in the occurrence of discharge between a cathode electrode and an adjustment electrode.SOLUTION: An X-ray generation device 1 includes a cathode electrode 5 that emits an electron E, an adjustment electrode 7 that adjusts the amount of releasing electrons from the cathode electrode 5, a control electrode 8 that controls an orbit of the electron E from the cathode electrode 5, a target 9 that generates X-rays R by the incidence of the electron E, a discharge detection unit 21 that detects discharge between the cathode electrode 5 and the adjustment electrode 7, and a voltage switching unit 22 that switches the voltage difference between the cathode electrode 5 and the control electrode 8 so that the focal dimension of the electron E at the target 9 at the discharge detection becomes larger than the focal dimension of the electron E at the target 9 at the normal operation.SELECTED DRAWING: Figure 1

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.

To provide an X-ray generation device capable of continuing suitable X-ray generation even in the occurrence of discharge between a cathode electrode and an adjustment electrode.SOLUTION: An X-ray generation device 1 includes a cathode electrode 5 that emits an electron E, an adjustment electrode 7 that adjusts the amount of releasing electrons from the cathode electrode 5, a control electrode 8 that controls an orbit of the electron E from the cathode electrode 5, a target 9 that generates X-rays R by the incidence of the electron E, a discharge detection unit 21 that detects discharge between the cathode electrode 5 and the adjustment electrode 7, and a bias switching unit 22 that switches the bias state of the electron E toward the target 9 so that the focal position of the electron E at the target 9 at the discharge detection is off from the focal position of the electron E at the target 9 at the normal operation.SELECTED DRAWING: Figure 1

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 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 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.

A linear accelerator in data communication with a computing device and a programmable logic controller and including a magnetron, an electron gun that is configured to direct an accelerated beam of el

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.

A device and method for creating beam formed X-Ray radiation using radio frequency (RF) modulated field emission X-ray sources is described. A radio frequency RF source generates a RF control signal which is supplied to an array of phase delay elements to generate multiple individually controlled phase delayed RF signals. These are then directly provided to each of a plurality of field emission sources (via a matching circuit) to generate a plurality of RF modulated electron current, or beam, each at the same frequency and phase delay of the phase delayed RF signals. Each of the electron beams impacts a target anode to generate X-rays also at the same frequency and phase delay of the phase delayed RF signals. By controlling each of the phase delay elements a beamformed X-ray radiation pattern can be generated.

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