Princeton's heat-first path to ignition

In Physical Review Letters (10 September 2026), Delgado-Aparicio, Ono and Menard generalized the Lawson criterion to include helium ash, wall impurities, synchrotron radiation and heat transport. Princeton's release of 5 October describes the result: heat the plasma first, then raise its density through the Cordey saddle, and ignition becomes more accessible.

One finding stands out: about one part in 10,000 of tungsten from the reactor walls can roughly double the pressure needed for ignition, within their model.

This is a theoretical result. Princeton plans digital experiments; nothing has been ignited this way. And ignition — self-sustaining heating — is not the same as net electricity from a power plant. The connection to this site's work is the method: the path through a constrained system matters, not only the endpoint. It is not evidence for a Riemann-zero mapping.