Abstract:
A cryogenic refrigeration system is provided having particular application in cooling a Magnetic Resonance Imaging system. The cryogenic refrigeration system comprises a conduit arranged as a cooling circuit through which a coolant fluid is pumped, the conduit being in thermal communication with a least one cooled stage for cooling the coolant fluid to a first temperature, and wherein the conduit comprises a cryotrap in communication with the coolant fluid, the cryotrap being operable to remove contaminants from the coolant fluid by cryogenic pumping. The conduit further comprises a flow impedance for cooling the coolant fluid to a second temperature lower than the first temperature, and a hydrogen filter upstream of the flow impedance and in communication with the coolant fluid, the hydrogen filter being cooled to a temperature below the freezing point of hydrogen in the coolant fluid and operable to remove contaminant hydrogen from the coolant fluid.
Abstract:
A cryopump has a simple-to-manufacture frontal baffle plate with improved gas distribution and has a large-area second-stage array plate to capture Type II gases. The cryopump has a first-stage frontal baffle plate having orifices and flaps bent from and attached to the orifices. The cryopump has a second-stage top plate that is larger in area than cooling baffles of the second stage array.
Abstract:
본 발명은 모노머 냉각트랩에 관한 것으로서, 증착 공정 중 발생하는 가스 및 모노머(monomer)를 외부로 배출하는 유로 상에 설치되며, 케이스; 상기 가스 및 모노머가 흡입되는 흡입구; 상기 케이스 내부에 수용되며, 내부에 냉매가 유동할 수 있는 유로가 형성되고, 표면에서 상기 모노머가 부착되며, 상하면을 관통하도록 형성된 관통홀을 구비하는 냉각 플레이트; 및 상기 케이스 내부의 가스가 배기되는 배기구;를 포함하는 것을 특징으로 한다.
Abstract:
Cryopump components are improved using thin layer heating elements for temperature control or to serve as heaters. These heating elements may be located and prevent pooling during regeneration. The temperature control may also be achieved through the use of ceramic heating elements. The ceramic heating elements may also include a second function of structural support within the cryopump. Temperature control may further be achieved via the radiation shield, where the radiation shield includes a clad sheeting or coating.
Abstract:
A dry pump (10) has adjacent its inlet (12) and between the inlet and pump foreline (14) an apparatus for abating the back flow of organic molecules originating from a lubricant used to lubricate a drive mechanism of the pump. In one embodiment, the apparatus comprises a first compartment (18) having extending from its internal wall a plurality of cooling baffle plates (20). The cooling baffle plates are cooled by means of a water-cooling coil (22). Between the first compartment (18) and the foreline (14) is a second compartment 24 having extending from its internal wall a plurality of interleaved baffles (26). These baffles are coated on their surfaces with activated charcoal pellets for adsorbing halocarbon molecules back-streaming from the pump inlet.
Abstract:
The present invention provides an improved aluminum chloride trap having a disposable element, wherein the disposable element contains trapping media for condensing, solidifying and trapping condensable aluminum chloride vapor. The trap is designed such that the disposable element may be easily removed for rapid and safe disposal of condensed aluminum chloride solids and subsequently replaced with a new disposable element. The disposable element efficiently traps condensable aluminum chloride vapor from an aluminum etch system without the need for internal or external cooling means, such that condensable aluminum chloride vapor is prevented from condensing and depositing on the interior walls of the trap or on the interior walls of a vacuum conduit system used in an aluminum etch system. The improved aluminum chloride trap of this invention eliminates the hazardous conditions associated with removing condensed aluminum chloride solids from the interior surfaces of the trap and from the interior walls of a vacuum conduit system of an aluminum etch system.
Abstract:
The liquid cooled trap (30) for effectively and efficiently collecting condensable vapor in a chemical vapor reaction system includes two stages. The first stage includes an entrance area (80) to the trap that is purposely designed to be large in space and a very poor heat exchanger in order to avoid condensation and resulting solid deposits that could clog the entrance port to the trap. The second stage (112) comprises a better heat exchanger to spread the condensation and deposits efficiently over a larger surface area and a longer flow path. The second stage (112) is a very efficient heat exchanger to clean up and remove whatever small amount of condensable vapor remains after the first stage of the trap. The second stage includes cooling coil tubes (120) and cooling cones (146) or fins (154) to increase the overall efficieny of the trap by increasing the interior surfaces upon which the flowing condensable vapor can condense, while not significantly reducing the flow conductance of the trap.
Abstract:
A cryogenic trap (12) is shielded by a floating baffle array (30) which is insulated from ambient temperature. The cryogenic trap includes a baffle array (20) which is suspended by conductive braid (50) from split cylinders (24A, 24B). The split cylinders are cooled by respective closed cycle refrigerators (40, 42).