Two vacuums, different jobs
STAGE 01
Rough it down
Mechanical roughing pumps take the volume from atmosphere to the crossover pressure where turbo pumps can take over without stalling.
1e-8 mbar
Base pressure
STAGE 02
Hold ultra-high vacuum
Turbomolecular and cryosorption pumping hold the torus where plasma physics requires it. Impurity influx is a performance limit, not a nuisance.
8×
Cryopumps
STAGE 03
Regenerate without stopping
Cryopumps saturate and must be regenerated. Sequencing the bank means pumping never fully stops, so long burns stay possible.
24/7
Continuous
1e-8 mbar
Base pressure
8×
Cryopumps
24/7
Continuous pumping
2
Vacuum boundaries
Hold the vacuum.
Vacuum supervision, regeneration sequencing, and leak detection all live in the plant control layer.
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