Center-Post Lifetime

The center post carries a limited operational lifetime, on the order of 0.01 fpy, and is designed as a replaceable module rather than a permanent structure.

An honest limit

The center post sits closest to the 14 MeV neutron source with almost no shielding, so it accumulates radiation damage faster than any other structure in the machine. Hyperion's design carries a limited center-post lifetime, noted at roughly 0.01 full-power-years (fpy). This is stated plainly as a design-and-simulation finding, not smoothed over: it is a real constraint on how the machine operates.

Why so short

Radiation damage in metals accrues as displacements per atom, and the center post's proximity to the plasma with minimal shielding means it reaches damaging fluence quickly. High operating temperature and mechanical load compound the effect. The compact spherical-tokamak geometry that gives Hyperion its high performance is the same geometry that limits the post's endurance.

Designed around, not away

Because the limit is intrinsic to the configuration, Hyperion addresses it operationally: the center post is a replaceable module with remote-handling access, so refurbishment is a scheduled maintenance event rather than a machine-ending failure. Extending post life through materials selection and any feasible inboard shielding is an active design and simulation question, and the fpy figure is expected to be refined as the design matures toward first-of-a-kind construction.

• Center-post life on the order of 0.01 fpy
• Driven by unshielded 14 MeV neutron exposure
• Managed by replaceable-module design and remote handling

This page describes a design and simulation study, not a built machine. Construction begins Q2 2027; first-of-a-kind first tritium is targeted near 2030.