A tiny pellet of deuterium and tritium released more energy than it absorbed from the National Ignition Facility’s bank of 192 lasers.

David Kramer:

Lawrence Livermore National Laboratory (LLNL) announced today that it has produced a fusion reaction in the laboratory that yielded more energy than was absorbed by the fuel to initiate it.

Zapping a BB-size capsule of fusion fuel with UV light from 192 lasers at the lab’s $3.5 billion National Ignition Facility (NIF), scientists say they sparked fusion reactions that released 1.3 megajoules of energy, about five times the 250 kilojoules that were absorbed by the capsule. That energy emission from the tiny blob of plasma—roughly a cube with sides measuring the width of a human hair—occurred within about 100 trillionths of a second to yield more than 1016 watts of power.

The shot, which occurred on 8 August, demolished the facility’s previous record yield of 170 kJ, observed in February, and was 25 times as high as the best results obtained just a year ago. “Everyone has a spring in their step,” says NIF director Mark Herrmann. The results have not yet been peer reviewed.