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China's Artificial Sun Generated a Magnetic Field, Clearing a Real Path for Fusion
It’s a crucial step forward in the quest for clean energy.
Because plasma reaches a million degrees, it can’t make contact with any other material, or it will both instantly cool down out of the energy range and damage or destroy the part it touches. But they all create hotspots that interrupt the plasma like an island in a stream—either because they are discretely installed at intervals around the shell of the tokamak, or simply because they’re made (by humans) of the naturally occurring materials we have on Earth. The vacuum vessel is essential to ITER’s goals, because it helps make the experiment plausibly safe to do—to contain a starlike reaction along the French waterfront.
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