42results about "X-ray tube electrical arrangements" patented technology

An field emitter array system (10) includes a housing (50). An emitter array (80) generates an electron beam and has multiple emitter elements (81) that are disposed within the housing (50). Each of the emitter elements has multiple activation connections (92).

An apparatus for modifying an aspect ratio of an electron beam to form a focal spot having a desired size and aspect ratio on a target anode is disclosed. The apparatus includes an emitter element configured to generate an electron beam having a first aspect ratio shape and an extraction electrode positioned adjacent to the emitter element to extract the electron beam out therefrom, the extraction electrode including an opening therethrough. The apparatus also includes at least one shaping electrode positioned to receive the electron beam after passing through the extraction electrode, the shaping electrode defining a non-circular aperture therein and being configured to provide at least one of shaping and focusing of the electron beam to have a second aspect ratio shape different from the first aspect ratio shape so as to form a focal spot having a desired size and aspect ratio on a target anode.

In a miniature x-ray tube, which may be on the order of approximately 1 mm in diameter or even less, a high voltage cable is provided in various embodiments for conducting current to the cathode of the x-ray tube and for conducting high voltage to the cathode and anode of the tube. In various embodiments of the cable, two conductors occupy a center region of the cable, packed as closely together as possible, in various shapes that are compact and present as smooth as possible an external shape for maximizing dielectric properties against the exterior high voltage ground, surrounding and generally concentric with the inner conductors. The inner conductors, which carry high voltage in opposition to the outer ground, can be in opposed D shapes, coaxial, two flattened conductors side by side, or simply a pair of cylindrical wires positioned as closely as possible. The space between the inner conductors and the outer ground can be occupied by a glass insulator, polymer, successive layers of polymers and adhesive, air, gas, vacuum or other dielectrics. A partially conductive region can surround the inner conductors.

A radiation generating tube, which includes: a cathode connected to an electron gun structure; an anode including a target and configured to generate radiation; and a tubular side wall disposed between the cathode and the anode to surround the electron gun structure; and an electrical potential defining member disposed at an intermediate portion of the tubular side wall between the anode and the cathode. The electrical potential defining member is electrically connected to an electrical potential defining unit via an electrical resistance member or an inductor, and a potential of the electrical potential defining member is defined to be a higher potential than a potential of the cathode and to be a lower potential than a potential of the anode.

The invention discloses an anode target, a ray light source, computed tomography equipment and an imaging method, and relates to the technical field of ray treatment. The anode target includes a plurality of target structures, a copper cooling body, a cooling oil tube and a shielding layer; the target structures are used for receiving electronic beams emitted by a cathode to generate rays, and multiple target points are of three-dimensional structures with bevels; the copper cooling body is used for bearing the target points and comprises an oxygen-free copper cooling body; the cooling oil tube is used for cooling the anode target; the shielding layer is used for achieving a shielding effect and comprises a tungsten shielding layer. By adopting the anode target, the ray light source, the computed tomography equipment and the imaging method, all the target points on the anode target can be distributed on a same straight line, the imaging equality of a ray system is improved, an the complexity of an imaging system is reduced.

The invention relates to a device and a method for testing an object (1) for material defects, a multi-emitter x-ray source (8), at least one x-ray detector (6) and a control system (10) to activate emitters (12, 12') of the multi-emitter x-ray source are thereby used. A selective activation of individual emitters (12, 12') or of a portion of the emitters is conducted according to the requirements of at least one item of information related to the tested object (1). The flexible and low-cost material testing is achieved.

The invention provides an external thermionic cathode distributed X-ray device, comprising a vacuum box which is sealed all around and is highly vacuum inside, a plurality of electronic emission units, an anode, and a power and control system. Each electronic emission unit is independent to each other and the electronic emission units are arranged in a linear array and are installed on the side wall of the vacuum box. The anode is installed in the middle part of the vacuum box. On the length direction, the anode is parallel to the arrangement line of the electronic emission units, and on the width direction, an included angle in a preset angle is between the anode and the installation plane of the electronic emission units. The power and control system is provided with a high-voltage power supply, a focusing power supply, an emission control device and a control system. The electronic emission unit is provided with a heating filament, a cathode connected with the heating filament, an insulating support piece which surrounds the cathode and a filament, a focusing electrode which is configured on the top end of the insulating support piece in a manner of being above the cathode, and a connecting fixing piece which is configured above the focusing electrode and is connected with the box wall of the vacuum box in a sealed manner. The filament lead passes through the insulating support piece and is connected with the emission control device.

Systems, methods, and devices with improved electrode configuration for downhole nuclear radiation generators are provided. For example, one embodiment of a nuclear radiation generator capable of downhole operation may include a charged particle source, a target material, and an acceleration column between the charged particle source and the target material. The acceleration column may include an intermediate electrode that remains floating at a variable potential, being electrically isolated from the rest of the acceleration column.