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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.


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.