In Reply to: Re: Helium Pump down time posted by Donald Mattox on 07/19/02 at 12:24 PM:
Many thanks for the reply and the information. This will help a lot.
I would, however, like to take this a bit further. Would you then say the effect that I described would be typical of a vacuum system build up using o-rings and containing metal parts screwed together when operated under room temperature?
Also, would contamination (rotary vane pump oil) influence the absorbtion characteristics of metals and ceramics even after cleaning.
And thirdly, the helium that we introduce into the system goes through a plasma chamber before it enters this vacuum chamber. The ceramics and metals (stainless steel) in this chamber do heat up to high temperatures. How will this influence absorbtion helium?
Anton de Beer