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Homework Help: High Vacuum Systems

  1. Dec 19, 2009 #1
    1. The problem statement, all variables and given/known data
    I'm doing a project where I have to design a high vacuum system (just on paper).

    I think I've figured out how all the parts hook up together, but I'm not sure how to operate the vacuum.

    2. Relevant equations

    3. The attempt at a solution
    So I have a chamber connected to an oil diffusion pump. The chamber has an ionization gauge in it for measuring the pressure, and it has a vent valve.

    Then there are supposed to be two valves in the connection between my chamber and my foreline trap. I don't understand why, can anyone explain?

    My foreline trap has a thermocouple gauge in it and it is connected to a rotary pump.

    So to make this thing work, what valves need to be open and closed? I think the vent valve needs to be opened to bring the pump to atmospheric pressure, then closed. Then I start up the oil diffusion pump? Or does the rotary pump go first? And when it's reached its lowest pressure, what valves do I open (after turning off the pumps, right?)
  2. jcsd
  3. Dec 20, 2009 #2
    You might try posting this down in the general engineering forum where design problems are discussed a lot.
  4. Dec 20, 2009 #3
    Okay, I will. Thanks!
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