Hyperion's heating power density is 2.37 MW/m³ — 2.22 times SPARC's — computed against built devices, not against a spreadsheet ideal. Power density, not raw megawatts, is the honest measure of how demanding a compact core is.
A small machine that makes real fusion power necessarily runs a high power density. Benchmarking Hyperion against SPARC — a device under construction with published parameters — keeps the comparison anchored to hardware people can point at, rather than to an unbuilt reference.
Power density sets the thermal and materials duty of the core. Stating it against a real machine tells reviewers exactly how far beyond demonstrated practice Hyperion reaches, and in which direction the engineering has to work.
| Heating power density | 2.37 MW/m³ |
| Versus SPARC | 2.22x |
| Benchmark | built / under-construction devices |
| Fusion power | 88.7 MW |
| Metric role | true measure of core duty |