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Scientists Hail ‘Big Moment’ for the Future of Nuclear Fusion as a Clean Energy Source

(LONDON, UK)—European scientists have taken a significant step closer to mastering a technology that could allow them to one day harness nuclear fusion, providing a clean and almost limitless source of energy, British officials said Wednesday.

Researchers at the Joint European Torus experiment near Oxford managed to produce a record amount of heat energy over a five-second period, which was the duration of the experiment, the U.K. Atomic Energy Authority said.

The 59 megajoules of sustained fusion energy produced were more than double the previous record achieved in 1997.

The agency said the result was “the clearest demonstration worldwide of the potential for fusion energy to deliver safe and sustainable low-carbon energy.”
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“If we can maintain fusion for five seconds, we can do it for five minutes and then five hours as we scale up our operations in future machines,” said Tony Donne, program manager for EUROfusion. “This is a big moment for every one of us and the entire fusion community.”

Ian Chapman, CEO of the U.K. Atomic Energy Authority, said the results were “huge step closer to conquering one of the biggest scientific and engineering challenges of them all.”

The facility, also known as JET, is home to the world’s largest and most powerful operational tokamak—a donut-shaped device that is considered one promising method for performing controlled fusion.

Scientists who were not involved in the project believed it was a significant result, but still a very long way from achieving commercial fusion power.

Carolyn Kuranz at the University of Michigan called the development “very exciting” and a step toward achieving “ignition,” which means that the energy consumed to initiate fusion equals the energy output.

She said the results appeared “very promising” for ITER, a much larger experimental fusion facility in southern France that uses the same technology and is backed by many European countries, the United States, China, Japan, India, South Korea and Russia.

Riccardo Betti, a fusion expert at the University of Rochester, said the achievement lay mainly in sustaining the reaction at high performance levels for five seconds, significantly longer than previously achieved in a tokamak.

The amount of power gained was still well below the amount needed to perform the experiment, he added.

Ian Fells, an emeritus professor of energy conversion at the University of Newcastle, described the new record as a landmark in fusion research.

“Now it is up to the engineers to translate this into carbon-free electricity and mitigate the problem of climate change,” he said. “Ten to 20 years could see commercialization.”

Stephanie Diem of the University of Wisconsin, Madison, said the technology used by JET to achieve the result, using magnets to control ultra-hot plasma, show that harnessing fusion — a process that occurs naturally in the stars — is physically feasible.

“The next milestone on the horizon for magnetic fusion is to demonstrate scientific breakeven, where the amount of energy produced from fusion reactions exceeds that going into the device,” she said.

Rival teams are racing to perfect other methods for controlling fusion and have also recently reported significant progress.

Scientists hope that fusion reactors might one day provide a source of emissions-free energy without any of the risks of conventional nuclear power.

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