SAN FRANCISCO – Researchers are poised to announce a key breakthrough in nuclear fusion, an elusive technology that advocates have long said holds the promise of cheap, abundant carbon-free power.
Scientists have been trying to achieve this for decades. The breakthrough creates the possibility of a system that would have enough energy to sustain a fusion reaction plus produce excess power that could be tapped and sold. Fusion energy, by contrast, is the power source of stars, whose immense gravity crushes together atoms of hydrogen to form helium. With fusion, there’s no long-lived radioactive waste.Experiments with fusion go back almost as far as those with fission, with the first fusion bomb detonated by the US in 1952. But explosions are one thing: A stable, controlled reaction that can run a power plant is quite another.
It uses lasers and powerful electromagnets arrayed around a super-cooled doughnut-shaped container, holding hot ionized gas. China is a member of ITER but is working on its own system as well, with a goal of sustainable fusion by 2040.
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