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They're using deuterium, but the figure mentions that they're fusing it with helium. But helium-3 is very expensive, and I'd been under the impression that deuterium / helium-4 fusion required impractically high temperatures to work?



helium 4 is stable (it's the alpha particle) so fusion with helium 4 either doesn't produce energy or it produces very little.

It's possible that the reactor does two reactions: 1) D + D -> 3He + n, 3He + D -> 4He + p.




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