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Effective plasma radius: Difference between revisions
→Effective radius based on flux
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To obtain the dimensional effective radius ''r''<sub>eff</sub> (in meters) of a flux surface, several possibilities exist. | To obtain the dimensional effective radius ''r''<sub>eff</sub> (in meters) of a flux surface, several possibilities exist. | ||
* | * From the volume ''V(ψ)'' enclosed in a flux surface (using ''V'' = 2 π<sup>2</sup>''Rr''<sub>eff</sub><sup>2</sup>) | ||
* | * From the surface area ''S(ψ)'' of a flux surface (using ''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). | Particularly in helical systems, choosing a value of ''R'' may be inappropriate (since the magnetic axis is not a circle). | ||