Rotational Energy Flux of Collisional Impurity Ions in Tokamaks with Strong, Unbalanced Neutral Beam Injection

摘要

A new 'rotational' energy flux has been derived for collisional impurity ions in tokamaks with strong unbalanced NBI. The derivation was based on a consistent ordering of kinetic theory. The 'rotational' flux, which is of a collisional origin and vanishes when the rotation vanishes, is approx. = (epsilon sup 2)/delta times larger than the conventional neoclassical energy flux. The 'rotational' energy flux and a previously derived momentum flux of a similar nature have been found to reproduce the experimentally observed relation between momentum and ion energy transport (tau sub phi)/(tau sub i) approx = 0(1), (chi sub phi)/(chi sub i) approx = 0(1). The magnitude of (chi sub i) resulting from the 'rotational' energy flux is the same as is observed in many tokamaks with strong, unbalanced NBI.