34results about "X-ray tube gas control" patented technology

A coolant passage is formed inside the rotary shaft while an air passage is formed inside the casing. A mechanical seal is arranged between the coolant passage and the air passage. Leakage cooling water, which has leaked in the form of vapor from the mechanical seal, is relegated radially outwardly along with air by the action of a rotary vane, which is disposed in the air passage, and finally flows out of an air outlet. A coolant sensor may be provided to early detect the leakage water.

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.

Disclosed herein are a high-voltage generator (120) for an x-ray source, an x-ray gun, an electron beam apparatus, a rotary vacuum seal, a target assembly for an x-ray source, a rotary x-ray emission target (500), and an x-ray source. These various aspects may separately and/or together enable the construction of an x-ray source which can operate at energies of up to 500 kV and beyond, which is suitable for use in commercial and research x-ray applications such as computerised tomography. In particular, the high-voltage generator includes a shield electrode (123a, 123b) electrically connected intermediate of a first voltage multiplier (122a, 122b) and a second voltage multiplier (122b, 122c). The electron beam apparatus includes control photodetectors (202a, 202b - not shown) and photo emitters (201a, 202a) having a transparent conductive shield (203a and 203b, 203c - not shown) arranged therebetween. The rotary vacuum seal includes a pumpable chamber (302) at a position intermediate between high-pressure and low- pressure ends of a bore (301) for a rotating shaft (401). The rotary target assembly is configured such that when a torque between a bearing housing (403) and a vacuum housing exceeds a predetermined torque, the bearing housing rotates relative to the vacuum housing. The rotary x-ray emission target (500) has a plurality of target plates (560) supported on a hub, the plates being arranged on the hub to provide an annular target region about an axis rotation of the hub. The x- ray gun is provided with a shield electrode (123a) maintained at a potential difference relative to the x-ray target different to the electron beam emission cathode.

X-ray generation tube includes electron gun, and anode having target to generate X-rays upon collision with electrons from the electron gun. The electron gun includes cathode having electron emitting portion, extraction electrode to extract the electrons from the electron emitting portion, and focusing electrode to focus the extracted electrons. The focusing electrode includes first portion having tubular shape, and second portion arranged inside the first portion. The first portion includes distal end facing the anode, the second portion includes opposing surface facing the anode, and the opposing surface includes electron passage hole through which the electrons from the electron emitting portion pass. Distance between the distal end and the anode is shorter than that between the opposing surface and the anode. Thermal conductivity of the distal end is lower than that of the second portion.

A system and method for providing a sealing arrangement in an X-ray tube are provided. The X-ray tube includes a rotating portion having a plurality of ball bearings and a liquid metal within a housing having the ball bearings therein. The rotating portion is configured to rotate an anode. The X-ray tube further includes a sealing portion formed by a liquid metal vacuum interface configured in a radial direction to resist flow of liquid metal from the housing to a vacuum portion.

An X-ray tube, including: an envelope (11) that holds inside thereof at a predetermined pressure; a filament (12) for emitting electrons and a focus electrode (13) provided in the envelope: and a target (15) for generating X-ray provided in the envelope facing to the filament (12) and the focus electrode (13), wherein the envelope (11) has an envelope body (11a) and an X-ray window portion (16) having a higher X-rays transmissivity and a higher electric conductivity than the envelope body (11a), when the X-ray window portion (16) or the anode (14) is set to a lower electric potential than both of an electric potential of the anode (14) or the X-ray window portion (16) and an electric potential of the filament (12) and the focus electrode (13), detection of at least one of an ion current (Ii) or an electron current (Ie) through the X-ray window portion (16) or the anode (14) is possible.

A rotating anticathode X-ray generating apparatus which is configured such that an X-ray is generated by an irradiation of an electron beam emitted from a cathode includes a rotating anticathode with an electron beam irradiating portion to generate the X-ray through the irradiation of the electron beam so that a direction of the electron beam is set equal to a direction of a centrifugal force caused by a rotation of the rotating anticathode; and a film for covering at least the electron beam irradiating portion so as to prevent an evaporation of a material making the rotating anticathode.

A method for generating X-ray radiation is disclosed. The method comprises providing (10) a liquid target (J) in a chamber (120), directing (20) an electron beam (132) towards the liquid target such that the electron beam interacts with the liquid target to generated X-ray radiation (134), estimating (30) a number of particles produced from the interaction between the electron beam and the liquidtarget by measuring a number of positively charged particles in the chamber and eliminating a contribution from scattered electrons to the estimated number of particles, and controlling (40) the electron beam, and/or a temperature in a region of the liquid target in which the electron beam interacts with the target, such that the estimated number of particles is below a predetermined limit. A corresponding X-ray source is also disclosed.

The object of the present invention is to provide a cold cathode X-ray tube capable of being driven stably over a long period of time by preventing temporal reduction in anode current. A cold cathode X-ray tube 1 comprises an electron emission part 10 including an electron emission element using a cold cathode, an anode part 11 disposed opposite to the electron emission part 10, a target 12 disposed on a part of a surface of the anode part 11, a housing 15 in which the electron emission part 10, the anode part 11, and the target 12 are disposed, and a hydrogen generation part 14 that is made of a material that generates hydrogen when receiving collision of electrons and disposed on a portion other than the surface of the target 12 out of surfaces existing in the housing 15.