Catalysed Deuterium–Deuterium (D–D)

D–D fusion needs only deuterium — abundant in seawater — but asks more of the machine. Kronos treats it as a strategic option, not a baseline.

Fuel

Deuterium only

Source

Seawater (abundant)

Trade

Higher temperature required

Deuterium fuses with itself along two branches of nearly equal probability, one yielding tritium and a proton, the other helium-3 and a neutron. 'Catalysed' D–D burns the tritium and helium-3 in situ. The appeal is fuel that needs no breeding; the cost is a lower reactivity that demands higher temperature and confinement.