Neutronics modeling demonstrates tritium breeding ratios scaling from 0.86 to design ceilings in spherical tokamaks, indicating breeding capacity is capped by the centrepost.
The blanket tritium-breeding lever of a compact spherical-tokamak breeder. Three-dimensional OpenMC neutronics on ENDF/B-VIII.0 place the lever from a bare lithium blanket (net TBR about 0.86), through a solid-beryllium-multiplied blanket, to an advanced blanket at the confirmed per-unit ceiling, reproducing across an independent nuclear-data evaluation to under 0.3 percent. The lever sets the per-unit tritium surplus; the centrepost caps the ceiling. Physics only; no economics.
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Ford et al. (2026) studied this question.
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