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What fusion power milestone did the Joint European Torus achieve in 1997?

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3D illustration of the interior reaction chamber of a tokamak fusion reactor, showing a large, cylindrical, metallic structure with curved walls and bright light panels. — fusion reactor A tokamak is a device used in nuclear-fusion research for magnetic confinement of plasma.

In 1997, the Joint European Torus (JET) achieved a significant milestone by generating 16 megawatts of peak fusion power, attaining a fusion gain—the ratio of fusion power produced to the net input power—of 0.6.1