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Physics

Nuclear fusion reaction releases almost twice the energy put in

The US National Ignition Facility has achieved even higher energy yields since breaking even for the first time in 2022, but a practical fusion reactor is still a long way off

By Matthew Sparkes

5 February 2024

Rendering of 192 laser beams as they reach the target in the center of the National Ignition Facility’s Target Chamber

Fusion experiments at the US National Ignition Facility have achieved a significant milestone

Philip Saltonstall

Scientists have confirmed that a fusion reaction in 2022 reached a historic milestone by unleashing more energy than was put into it – and subsequent trials have produced even better results, they say. The findings, now published in a series of papers, give encouragement that fusion reactors will one day create clean, plentiful energy.

Today’s nuclear power plants rely on fission reactions, where atoms…

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