Effective plasma radius: Difference between revisions

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(Created page with 'The definition of the effective plasma radius is non-trivial for stellarators, yet needed for comparing the measurements of diagnostics. Various alternative definitions are poss…')
 
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Various alternative definitions are possible.
Various alternative definitions are possible.
Assuming the existence of toroidally nested flux surfaces, the simplest definition is to define the mean radius as a function of some flux function.
Assuming the existence of toroidally nested flux surfaces, the simplest procedure is to define the mean radius as a function of some flux quantity (i.e., any quantity that is constant on a flux surface).
At [[TJ-II]], magnetic equilibria can be obtained from the [[VMEC]] code. It returns ''ψ'', the poloidal magnetic flux. The effective radius is defined by
At [[TJ-II]], magnetic equilibria can be obtained from the [[VMEC]] code. It returns ''ψ'', the poloidal magnetic flux. The effective radius is defined by


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