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Question
How big is a Kronos machine?
The breeder is compact (~1.2 m major radius); the burner scales in length from 55 to 1400 m by product.
How big is a Kronos machine?
The breeder is genuinely compact — a 1.2 m major-radius spherical tokamak. The burner is linear and scales by product: 55 m (reference), 440 m (AEGIS), 1400 m (MetroVolt). One physics core, three lengths.
Compactness comes from high field; the burner's length sets its power class.