The Spherical-Tokamak Story

How the low-aspect-ratio idea grew into a serious reactor line.

Line

Low-A, high-beta

The spherical tokamak emerged from the insight that squeezing the torus to low aspect ratio yields high beta and strong shaping. Experiments established its physics, and high-temperature superconductors now make a compact ST reactor credible — the lineage of the Kronos breeder.

It is a maturing line with a clear reactor rationale.