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Freux wrote

** Put expert glasses on **, you can see how the wavy donut shape of the tokama reactor surrounded by multiple rings make it better at producing energy with less material. You're all welcome.

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TheLegendaryBirdMonster OP wrote

tokamak is left, stellarator is right.

it's got a donut shape thanks to the hairy ball theorem -to keep the plasma from leaking, the magnetic coil must create a field tangent to the surface of the plasma; and only a donut can do that.

tokamak uses the magnetic coils to create a field inside the plasma for more stablility; while stellarator give the donut a screw-like shape and that makes it stable.

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