REBCO HTS magnets.

REBCO tape is the material that makes compact fusion possible: it stays superconducting at high field and higher temperature than older superconductors, so the magnets can be smaller and stronger.

REBCO

Rare-earth barium copper oxide — an HTS tape

Why it matters

High field in a compact coil

Breeder

Compact HTS coils

Burner

High-field end plugs — 26.49 T throat (frozen A11)

Fusion power density rises steeply with magnetic field, so the strongest practical magnets let the smallest practical machines work. REBCO (rare-earth barium copper oxide) is a high-temperature superconductor that carries very high current density at very high field — the enabling technology behind the current generation of compact fusion. Kronos's founding magnet expertise is in exactly this domain.

Both machines use high field, differently. The breeder relies on compact HTS coils to reach its performance at a 1.2 m major radius. The burner concentrates field in its end plugs, with a frozen ion-end throat of 26.49 T — the field that both confines the central cell and sets the machine's end-expander requirement.