How strong are the Kronos fields?

Strong enough to make fusion compact. For scale: a hospital MRI is about 1.5–3 tesla; the Kronos burner's end-plug throat is 26.49 tesla — roughly ten times that.

Hospital MRI

≈ 1.5–3 T

Earth's field

≈ 0.00005 T

Kronos burner throat

26.49 T (frozen A11)

Breeder

Compact HTS coils

Magnetic field is measured in tesla (T). To place the Kronos numbers: Earth's field is about 0.00005 T, a fridge magnet a few hundredths of a tesla, and a hospital MRI 1.5–3 T. The Kronos burner uses an ion-end plug throat of 26.49 T — around ten times an MRI — to confine its central-cell plasma.

The breeder reaches its performance with compact high-temperature-superconductor (HTS) coils, the same materials that let modern compact tokamaks run at high field in a small volume. High field is the lever behind compactness: fusion power density climbs steeply as the field rises, so a stronger magnet lets a smaller machine do the same job.

(An earlier Kronos design quoted a single 24.42 T tokamak magnet; that figure belonged to the superseded tokamak-era architecture. See the Kronos magnet systems.)