ION-TEMPERATURE-GRADIENT INSTABILITY DRIVEN TRANSPORT AND ITS PARAMETRIC SCALING

Experiments are reported on the ion thermal transport due to the ion-t emperature-gradient-driven instability (ITG mode) and its transport sc aling properties with respect to instability parameters like fluctuati on level ($) over tilde$$ n/n(i) and linear growth rate as well as the drive parameter eta(i)(=partial derivative 1n[T-i]/partial derivative ln[n(i)]) in the Columbia Linear Machine [Phys. Fluids 26, 1044 (1983 )]. The measured local ion thermal conductivity chi perpendicular to ( r) is highly anomalous and strongly correlated with the radial profile of the ITG mode. The linear scaling of the averaged thermal conductiv ity <chi perpendicular to (r)> with the averaged mode fluctuation leve l (<($) over tilde$$ n/n(i)>) and linear growth rate indicates strong turbulence-type scaling. The scaling of chi perpendicular to with the drive parameter eta(i) is offset linear.