The burner's axial power loss — about 906 MW over two apertures, some 195 MW/m² at the throat — is far too concentrated to collect directly. The end-expander spreads it 53-fold to roughly 3.7 MW/m² on the end wall. Sizing that surface to survive the heat flux is as much a part of the design as the plasma itself.
The 906 MW axial loss arrives across two apertures at about 195 MW/m² — unhandleable as is. A 53x field expansion (26.49 T to 0.5 T) drops it to about 3.7 MW/m², a flux the collecting surfaces can take continuously. The end-wall load follows from the axial power and the expansion ratio together, both carried in the frozen record (B30).
Power handling is where many fusion concepts quietly fail; a converter that cannot survive its own input is not a converter. Publishing the axial power, the aperture flux, and the post-expansion end-wall load makes the heat-handling problem explicit and sizable, not hidden.
| Axial power loss | ~906 MW (two apertures) |
| Aperture flux | ~195 MW/m² |
| Expansion | 53x (26.49 T -> 0.5 T) |
| End-wall load | ~3.7 MW/m² |
| Status | requirement; no spec exists (B30) |