Designing & Operating a High Vacuum System

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SUMMARY

This discussion focuses on the design and operation of a high vacuum system, specifically involving an oil diffusion pump, ionization gauge, vent valve, foreline trap, thermocouple gauge, and rotary pump. The user seeks clarity on the sequence of valve operations for effective vacuum creation and maintenance. It is established that the vent valve must be opened to equalize pressure before closing it, followed by starting the rotary pump and then the oil diffusion pump. Proper valve management is crucial for achieving and maintaining the desired vacuum levels.

PREREQUISITES
  • Understanding of high vacuum systems and their components
  • Familiarity with oil diffusion pumps and rotary pumps
  • Knowledge of pressure measurement using ionization and thermocouple gauges
  • Basic principles of vacuum operation and valve control
NEXT STEPS
  • Research the operational sequence for oil diffusion pumps and rotary pumps
  • Learn about the function and calibration of ionization and thermocouple gauges
  • Explore the design considerations for foreline traps in high vacuum systems
  • Investigate common troubleshooting techniques for vacuum systems
USEFUL FOR

Engineers, physicists, and students involved in vacuum technology, as well as anyone designing or operating high vacuum systems.

jumbogala
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Homework Statement


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.


Homework Equations





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?)
 
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You might try posting this down in the general engineering forum where design problems are discussed a lot.
 
Okay, I will. Thanks!
 

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