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Science
David Donovan, Associate Professor of Nuclear Engineering, University of Tennessee

Nuclear fusion hit a milestone thanks to better reactor walls – this engineering advance is building toward reactors of the future

Magnetic fusion reactors contain super hot plasma in a donut-shaped container called a tokamak. dani3315/iStock via Getty Images

Scientists at a laboratory in England have shattered the record for the amount of energy produced during a controlled, sustained fusion reaction. The production of 59 megajoules of energy over five seconds at the Joint European Torus – or JET – experiment in England has been called “a breakthrough” by some news outlets and caused quite a lot of excitement among physicists. But a common line regarding fusion electricity production is that it is “always 20 years away.”

We are a nuclear physicist and a nuclear engineer who study how to develop controlled nuclear fusion for the purpose of generating electricity.

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