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Effective plasma radius: Difference between revisions
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The definition of the effective plasma radius is non-trivial for stellarators, yet needed for comparing the measurements of diagnostics. | The definition of the effective plasma radius is non-trivial for stellarators, yet needed for comparing the measurements of diagnostics. | ||
Various alternative definitions are possible. | Various alternative definitions are possible, some of which are discussed below. | ||
The numerical value of the effective radius has hardly more significance than that of providing a flux surface label, | |||
except when plasmas from different machines are compared. | |||
Therefore, this issue is relevant for the elaboration of multi-machine [[Scaling law]]s. | |||
== Normalized effective radius based on flux == | == Normalized effective radius based on flux == | ||
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== See also == | == See also == | ||
* [[:File:Surf_vol.pdf|Comments on the use of the minor radius for stellarators]] | * [[:File:Surf_vol.pdf|Comments on the use of the minor radius for stellarators]], where it is argued that it is preferable to use the Volume or Surface directly, instead of the effective radius, in view of the ambiguities in the definition of the latter - at least when making comparisons between different machines, e.g., in the framework of [[Scaling law]]s. | ||
== References == | == References == | ||
<references /> | <references /> | ||