Experimental Tests of Elongation Scaling in Gyrokinetic Turbulence Simulations*

Comparisons of nonlinear GYRO simulations of DIII-D discharges with low and high elongation against experimental measurements are presented. Comparisons of measured low-$k$ density spectra (from beam emission spectroscopy), intermediate-$k$ density spectra (from Doppler backscattering), and low-$k$ electron temperature spectra (from correlation electron cyclotron emission radiometry) to synthetic spectra predictions at multiple flux-surfaces are shown. Results using both direct fits to profile measurements and flux-matching profiles predicted by the new TGYRO code [1] are presented, with agreement between model and experiment assessed via a simple set of newly developed validation metrics. \vskip4pt \noindent [1] J. Candy, et al., General Atomics Report GA-A26380 (2009).