Database study of turbulent electron temperature fluctuation measurements at ASDEX Upgrade

Turbulent transport plays a central role in determining energy and particle confinement times in tokamaks. The correlation electron cyclotron emission (CECE) diagnostic installed on the ASDEX Upgrade (AUG) tokamak measures broadband, long-wavelength (k_θρ_s ≤ 0.3) electron temperature fluctuations, yielding insight into turbulence-driven transport. In this work, an automated method for the analysis of CECE data is being applied to thousands of discharges at AUG in order to build a large-scale experimental turbulence database. The database provides a unique opportunity to search for large-scale trends in turbulent electron temperature fluctuation levels over a wide range of parameter space and allows for direct comparisons with cutting-edge numerical models. The database is used to investigate the physics of tokamak plasma turbulence, including studying the effects of collisionality and gradients on the turbulence measured by the CECE diagnostic.