Measuring the Dependence of Turbulence Characteristics and Transport Behavior on $\rho $* Through Dimensionless Scaling Experiment in HL-2A*

The variation of local long wavelength density fluctuation characteristics with $\rho $* are measured with beam emission spectroscopy (BES) in HL-2A plasmas while other dimensionless quantities are held nearly fixed, to examine how turbulence and transport depend on $\rho $*, the dimensionless size parameter. The ion gyroradius is varied while holding other dimensionless parameters ($\beta $, q, $\kappa $, $\nu $, R$/$a, M\textunderscore A, T\textunderscore i$/$T\textunderscore e) nearly fixed by varying the toroidal field and plasma current and adjusting input power and density accordingly to match profiles. The normalized density fluctuation amplitude (\~{n}/n), poloidal and radial correlation lengths, decorrelation time, and poloidal velocity are calculated from a 16 (radial) by 2 (poloidal) channel array of BES density fluctuation measurement over the minor radial range, $\rho =$0.2-0.8s. Initial results demonstrate localized poloidal velocity flow reversals and variation in correlation properties with $\rho $*. The analysis of turbulence and transport dependence on $\rho $* is aimed at predicting confinement in ITER-like large scale plasmas.