One of our Varian Turbo-DRY pumps, fitted with a diaphragm pump and V70LP turbine. As the name suggests, the pump is operating without oils in the vacuum path. At the pump entrance, a minimum pressure of 2e-9mBar is listed.
One of our Varian Turbo-DRY pumps, fitted with a diaphragm pump and
V70LP turbine. As the name suggests, the pump is operating without oils in
the vacuum path. At the pump entrance, a minimum pressure of 2e-9mBar
is listed.
Before installation in a cryostat, components are baked in this custom built
vacuum oven. At a pressure of <1e-4mBar and a temperature of 120C or more,
depending on the material, most contaminants are removed in some hours.
Heating is provided by high power resistors,
mounted below the table inside the oven.
Our Residual Gas Analyzer (RGA) connected to a cryostat to check for
signs of contamination.
Also, by spraying Helium onto the cryostat, the RGA can be used as a
efficient leak tester.
After manufacturing a cryostat, it is baked while being pumped.
Baking cycles are repeated until the cryostat appears clean. Contaminants
unually leave a haze on the relatively cool window.
The outer vessel is heated by a 200W heater band to a temperature of 80C,
and the LN2 tank is heated to 110C by blowing in warm pressurised air.
Here is a set of IDL procedures for
analysing RGA spectra
.
With "rgacomp.pro", you will be able to compare spectra,
subtract background, etc.
With "rganalyze.pro", you can fit gas libraries to your spectra.
Last updated December 13, 2001