Physicists just rewrote a foundational rule for nuclear fusion reactors that could unleash twice the power

Fusion reactors could generate more power thanks to a reworking of Greenwald's Law.

The research, led by physicists from the Swiss Plasma Center at École Polytechnique Fédérale de Lausanne (EFPL), has determined that the maximum hydrogen fuel density is about twice the “Greenwald Limit” – an estimate derived from experiments more than 30 years ago.

A study about the discovery was published May 6 in the journal Physical Review Letters.