Core and edge turbulence measurements in wide pedestal quiescent H-mode plasmas without power degradation of energy confinement

Wide pedestal quiescent H-mode plasmas at the DIII-D tokamak have shown insensitivity of the energy confinement time to the heating power (P_NBI). In an earlier work, we have shown that the lack of power degradation of confinement in these plasmas is due to the formation of ion internal transport barriers (ITB) and thus, to the increased stored energy as P_NBI increased. Flux-matched TGLF analysis via TGYRO predicts that the ITB is stabilized by E×B shear, T_i/T_e ratio and at the high P_NBI, by the Shafranov shift. Here, we document the core and edge fluctuation measurements for these plasmas measured by the turbulence diagnostics. Density fluctuations measured by the multichannel CO₂ interferometer show a decrease inside ITB. Within the pedestal, low-k turbulence measured by beam emission spectroscopy (BES) shows reduction in density fluctuations as P_NBI increased, while the BES measurements in the pedestal-top show an opposite trend. Additionally, intermediate-k turbulence measured by the Doppler backscattering diagnostic shows reduction in density fluctuations. However, magnetic fluctuations increase in amplitude. Preliminary gyrokinetic simulations and comparison to transport fingerprints suggests electrostatic transport. Details of the measurements and their comparisons with simulations will be presented.