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Effective plasma radius: Difference between revisions
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→Based on flux surfaces
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If the flux surfaces are known (typically, by calculating the Magneto-Hydrodynamic equilibrium), and 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). | If the flux surfaces are known (typically, by calculating the Magneto-Hydrodynamic equilibrium), and 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 normalized effective radius is defined by | At [[TJ-II]], magnetic equilibria can be obtained from the [[VMEC]] code (see [[TJ-II:Magnetic co-ordinates]]). It returns ''ψ'', the poloidal magnetic flux. The normalized effective radius is defined by | ||
:<math>\rho_{\rm eff} = \sqrt{\psi_N}</math> | :<math>\rho_{\rm eff} = \sqrt{\psi_N}</math> | ||