Like every cryopump, the COOLVAC binds the gas molecules which have to be pumped on cold surfaces.
There are surfaces at different temperature levels to capture gases with different freezing points. There are, for instance:
Argon & Nitrogen
Water vapor is condensed at a temperature of about 100 K on the baffle of the inlet flange of the pump. The baffle is cooled by the first stage of the refrigerator and then connected to the first stage by the radiation shield which has a temperature of 80 – 100 K.
Argon or Nitrogen condense at about 15 K on the cold panels at the second stage of the refrigerator. During pumping, the ice layer grows continuously. Hydrogen is absorbed by activated charcoal on the inner side of the cold panels.
Related: Browse our collection of Cryo Pumps, Cold Heads and Compressors on this product page.