Non-dimensional scaling of turbulence characteristics and turbulent diffusivity

Plasma turbulence characteristics. including radial correlation lengths, de correlation times. amplitude profile and flow velocity, have been measured during a rho* scan oil DIII-D while all other transport, relevant dimension less quantities (e.g., beta, nu* kappa, q, T-e/T-i) are field nearly consta nt. The turbulence is measured by examining the correlation properties of t he local long wavelength (k(perpendicular to)rho (i) less than or equal to 1) density fluctuations, measured with beam emission spectroscopy. The radi al correlation length of the turbulence L-c,L-r is shown to scale with the local ion gyroradius, L-c,L-r approximate to 5 rho (i) while the decorrelat ion times scale with the local acoustic velocity as tau (c) similar to a/c( s). The turbulent diffusivity parameter, D similar to (L-c, r(2)/tau (c)), scales in a roughly gyro-Bohm-like fashion, as predicted by the gyrokinetic equations governing turbulent transport. The experimental one fluid power balance heat diffusivity scaling and that front GLF23 modelling compare rea sonably well.