At the reference point, 0.648 of the burner's power reaches the converter as directed particle energy — computed with synchrotron radiation charged against it, not with an idealized ceiling. The directed fraction is what the whole direct-conversion case is built on, so it is computed honestly.
The directed fraction is the share of power leaving as collectible charged-particle energy after radiation and other losses are subtracted. The reference solve returns 0.648 with synchrotron charged — a real, loss-inclusive value. An earlier evaluator quoted 0.871, but that figure had no synchrotron term at all.
The converter must be specified against the power that actually reaches it, not against an optimistic ceiling. Using 0.648 rather than 0.871 sizes the converter to reality and keeps the plant ledger from booking energy that radiation already took.
| Directed fraction | 0.648 (synchrotron charged) |
| Prior ceiling | 0.871 (no synchrotron) |
| Feeds | converter specification |
| Loss subtracted | synchrotron radiation |
| Basis | reference-point solve |