Major next steps for fusion energy based on the spherical tokamak, compact machines that are shaped like cored apples. The spherical design produces high-pressure plasmas — essential ingredients for fusion reactions — with relatively low and cost-effective magnetic fields.

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Major next steps for fusion energy based on the spherical tokamak, compact machines that are shaped like cored apples. The spherical design produces high-pressure plasmas — essential ingredients for fusion reactions — with relatively low and cost-effective magnetic fields.