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Effective plasma radius: Difference between revisions
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→Effective radius based on volume or surface
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* Use the surface area ''S(ψ)'' of a flux surface (''S'' = 4 π<sup>2</sup>''Rr''<sub>eff</sub>) | * Use the surface area ''S(ψ)'' of a flux surface (''S'' = 4 π<sup>2</sup>''Rr''<sub>eff</sub>) | ||
Here, ''R'' is the [[Toroidal coordinates|major radius]] of the [[:Wikipedia:Torus|torus]]. | Here, ''R'' is the [[Toroidal coordinates|major radius]] of the [[:Wikipedia:Torus|torus]]. | ||
Particularly in helical systems, choosing a value of ''R'' may be inappropriate (since the magnetic axis is not a circle). | |||
One can avoid making an (arbitrary) choice for ''R'' by defining | One can avoid making an (arbitrary) choice for ''R'' by defining | ||