The relation between momentum and thermal transport in neutral-beam-heated tokamaks with subsonic toroidal rotation velocity has been investigated. A theory of diffusive momentum transport driven by ion-temperature-gradient-driven turbulence (ηi turbulence) is presented. In addition, the level of ηi turbulence is enhanced by radially sheared toroidal rotation. The resulting ion shear viscosity is χφ=1.3{(1+ηi)/τ+[(Ln/2cs) (dV0/dr)]2}2(ρ2scs/ Ls). The associated ion thermal diffusivity, χi, is identical to χφ. Thus a scenario based on velocity-shear-enhanced ηi turbulence is consistent with the experimentally observed relationship between thermal and momentum confinement.
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Mattor et al. (1988) studied this question.
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