This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations.(January 2013) (Learn how and when to remove this message)
A cryopump or a "cryogenic pump" is a vacuum pump that traps gases and vapours by condensing them on a cold surface, but are only effective on some gases. The effectiveness depends on the freezing and boiling points of the gas relative to the cryopump's temperature. They are sometimes used to block particular contaminants, for example in front of a diffusion pump to trap backstreaming oil, or in front of a McLeod gauge to keep out water. In this function, they are called a cryotrap, waterpump or cold trap, even though the physical mechanism is the same as for a cryopump.
Cryotrapping can also refer to a somewhat different effect, where molecules will increase their residence time on a cold surface without actually freezing (supercooling). There is a delay between the molecule impinging on the surface and rebounding from it. Kinetic energy will have been lost as the molecules slow down. For example, hydrogen does not condense at 8 kelvins, but it can be cryotrapped. This effectively traps molecules for an extended period and thereby removes them from the vacuum environment just like cryopumping.
A cryopump or a "cryogenic pump" is a vacuum pump that traps gases and vapours by condensing them on a cold surface, but are only effective on some gases...
Entrapment pumps capture gases in a solid or adsorbed state; this includes cryopumps, getters, and ion pumps. Positive displacement pumps are the most effective...
the skin by freezing them. It is used in laboratory cold traps, and in cryopumps to obtain lower pressures in vacuum pumped systems. It is used to cool...
by liquid nitrogen to shut down residual outgassing and simultaneously cryopump the system. Fluids cannot generally be pulled, so a vacuum cannot be created...
Edwards purchased Brooks Automation's CTI-Cryogenics and Polycold branded cryopump operations based in Chelmsford and Monterrey for US$675 million in 2018...
cold trap is referred to as the condenser. Cold traps are also used in cryopump systems to generate hard vacua by condensing the major constituents of...
temperatures and magnetic confinement. ITER uses cooling equipment like a cryopump to cool the magnets to close to absolute zero. High temperatures give the...
life science systems equipment, gas analysis and vacuum measurement, cryopumps, cryochillers and compressors, asset tracking equipment. The company features...
secondary mechanical forepump and exhausted. Unlike turbomolecular pumps and cryopumps, diffusion pumps have no moving parts and as a result are quite durable...
widespread application in many low-temperature systems e.g. in MRI and cryopumps. Fig.5 is a schematic diagram. Helium at pressures in the 10–30 bars (150–440 psi)...
wide variety of MS platforms and from a variety of vendors. In 1998, the cryopump API III platform began to be replaced with turbo-molecular-pumped single...
deposition metallizer which uses a combination of mechanical vacuum pumps and cryopumps to lower the total vapour pressure inside a chamber to a hard vacuum....
are to be carefully verified. vacuum pumps: two 8 m long, 1.6 m high cryopumps will be installed on each side of the vacuum vessel. The fatigue life...
Global Information