Vacuum chamber pressure calculation in TOKAMAKS

[Dr. Octavious]

Hello all!

I understand the concept of the TOKAMAK vacuum chamber, but can someone explain to me how I can actually calculate the pressure in which I need the chamber to be evacuated? I know it should be in the range of approximately 10^-7 or so but more specifically, is there an equation to calculate the actual number?

Thank you in advance.

 

[mfb]

Better will work better, and different tokamaks will use different pressures. Did you check the publications?

 

[Dr. Octavious]

Better will work better, and different tokamaks will use different pressures. Did you check the publications?

I've searched online in PDFs and some, related to my question, publications but I couldn't find anything besides general information regarding vacuum and its typical values for a tokamak. I didn't find anything regarding a calculation process.