BUILD 07 · COMMISSION
How long until it reaches the number I specified?
The pumpdown curve is the first honest measurement a chamber makes. This step compares the predicted curve against the specification set in step one.
What already answers this
Nothing below is a copy. Each line is the surface of this site that carries the answer, and what it carries.
- /tools/outgassing/#calculate runs the pumpdown from the sourced gas load, and names the key it read
- /academy/surface-science/ carries the desorption that makes the tail of the curve
- /scale/ places the reached pressure back on the ruler the specification used
Not in the base yet
What this step cannot answer, and why. Every count below is read from the corpus at build, so this block shrinks on its own the day the data grows.
- unsourced The pumpdown model reads 258 entries of sourced outgassing and no pump curve at all. A pump that loses speed near its base pressure is not modelled, so a predicted time near the ultimate is optimistic and the calculator says so.
- unsourced No commissioning record from a real machine is carried. Nothing here is validated against a chamber that was actually pumped down.