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KRONOS FUSION ENERGYWHITEPAPER 010 / 104
Hyperion — The Breeder
Hyperion breeder · design render
Hyperion breeder · design render · © 2026 KFE

The 14 MeV Neutron a Mirror Cannot Make

Neutron flux versus radius through blanket and shield — OpenMC.
Neutron flux versus radius through blanket and shield — OpenMC. canon 2026-08-27 · © 2026 KFE
Materials qualification needs fusion-spectrum neutrons, and only the D-T breeder produces them at rate.

Hyperion's D-T fill produces 14 MeV neutrons at full rate — the fusion-spectrum neutron that materials qualification actually requires, and the one a low-neutron D-3He mirror deliberately does not make. This is why the breeder, not the burner, serves the irradiation market.

The science

Structural materials for any fusion plant must be qualified against 14 MeV neutrons, whose damage spectrum differs from fission neutrons. Producing them requires a D-T reaction; the burner's D-3He cycle is chosen precisely to suppress neutrons, so it cannot serve this need. Hyperion's D-T fill fills exactly that gap.

Why it matters

The retired standalone neutron-source concept could only reach a fraction of a reference irradiation facility. Subsuming that role into Hyperion — where the D-T fill makes 14 MeV neutrons the 2.45 MeV mirror never could — turns a weak standalone product into a strong co-product of the breeder.

The numbers

Neutron energy14 MeV (fusion spectrum)
SourceD-T fill in Hyperion
Burner equivalentnone (low-neutron by design)
Usematerials qualification
Historystandalone neutron-source concept retired into Hyperion
Straight answersOld neutron-source figures (0.186 MW fusion, '0.31x a reference facility', 9 m straight-bore mirror geometry) do NOT transfer to Hyperion and are retired — the spherical tokamak is a different machine with a full-rate D-T spectrum.
Kronos is the fusion company that shows its work. Every figure here traces to the openly deposited Kronos simulation programme and design-point records (CC BY 4.0). Read the series, run the code, check us. — All whitepapers · Read the formal papers & open data
Building toward first construction in 2027 — isotopes first, electricity next. Quantitative values are simulation-derived and carry the feasibility gates named in the text; superseded values are kept in the record with era labels. This document is informational and is not an offer of securities. © 2026 Kronos Fusion Energy, Inc. · Los Angeles, California.
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