Design-Point Freeze and Change Control
The Aegis numbers are a frozen design point under change control, so quoted figures stay consistent across the whole microsite.
Why freeze the numbers
A moving design point makes honesty impossible; readers cannot tell a real update from a quiet revision. Aegis therefore works from a frozen canonical design point — 26.49 T plug, 17 T throat, 5.44% neutron fraction, ~90 keV — and every page quotes those exact figures.
How change control works
Any change to a canonical figure is a controlled event: it is logged, the affected gates are recomputed, and dependent pages are updated together. This prevents the common failure where one page cites an old number and another a new one.
What this protects
Freezing protects the reader. If the plug field or neutron fraction changed silently, the four gates would no longer mean what the pages say. The freeze is a trust mechanism, not a bureaucratic one.
Freezing the numbers is a service to the reader, not a bureaucratic reflex. If the plug field or neutron fraction drifted silently, the four gates would no longer mean what the pages say they mean. Change control makes any revision a visible, logged event that recomputes the affected gates and updates dependent pages together, so no two pages ever disagree about a canonical figure.