Which gas cannot be pumped by titanium sublimation pump?
Finally the residual gas composition is important – typically the pump works well with the more reactive components (such as CO and O2), but is very ineffective at pumping inert components such as the noble gases and methane (CH4). Therefore, TSP must be used in conjunction with other pumps.
What is the working principle of a titanium sublimation pump?
It works by evaporating a titanium film onto the cryopanel or TSP shield. The titanium film is very reactive and so the gas molecules in the chamber that collide with the cryopanel wall will react with the titanium and stick. The titanium film also helps to replenish the ion pump elements.
What are cryogenic pumps used for?
A cryopump is vacuum pump that traps gases and vapors by condensing them on a cold surface. For efficient evacuation under ultra-high vacuum, the vapor pressure for condensation, or the equilibrium pressure for adsorption must be less than 10-8Pa. Figure 1 shows vapor pressures of different gases.
How does an ion getter pump work?
Ion getter pumps require a large magnetic field within an isolated chamber and use high voltages to pull electrons into the assembly. Pumping relies on the sputtering of getter materials inside a series of cells and by the implantation or burial of the ions produced.
What is getter ion pump?
Ion getter pumps (IGP) are devices able to create and maintain ultra-high-vacuum, reaching pressures as low as 10 . Lower pressures are in principle achievable, but their measurement is particularly challenging and strongly depends on the outgassing of the system on which the ion pump is mounted.
What is getter activation?
GETTER ACTIVATION UNDER VACUUM. A getter assembly for a vacuumed compartment having a plate. A primary getter material is deposited on the plate. A cover layer is deposited over the primary getter material on the plate.
What is a NEG pump?
NEG pumps are vacuum pumps whose working principle is based on chemisorption and absortpion. NEG pumps have several unique characteristics which make them particularly attractive from high vacuum (HV) to ultra-extreme high vacuum (UHV-XHV). SAES NEG pumps key features: Extremely effective for Hydrogen.
What is Portacryo?
PORTACRYO is an excellent product combining the convenience & flexibility of Micro-bulk storage with versatile functionality of a standard bulk tank, quick & convenient on-site installation.
What is Cryotrapping?
Cryotrapping involves pumping air through a cooled loop, which usually contains an inert material such as glass beads to improve the trapping efficiency. From: Chemistry of the Upper and Lower Atmosphere, 2000.
Are ion pumps active or passive?
The proteins that transport ions across membranes fall into two general classes: passive conduits called ion channels, through which ions rush down gradients of concentration and electric potential, and pumps that release energy from ATP or other source to actively push ions against those gradients and so build them up …