Edge turbulence in DIII-D plasmas with strong negative triangularity shaping

In the DIII-D 2023 experimental campaign, plasmas with strong negative triangularity shaping with an average triangularity ~-0.5 have demonstrated high performance similar to the conventional positive triangularity shape H-modes and in the absence of edge localized modes (ELMs). This work presents broadband fluctuations of electron temperature (T_e) from correlation electron cyclotron emission at the edge of these plasmas, as well as density (n_e) turbulence and turbulence poloidal flow velocities from Doppler backscattering in a radial range of ρ~0.85-1.0. It is observed that T_e turbulence has a much larger (generally more than 2-3 times) amplitude in negative triangularity than that in conventional H-mode plasmas. The radial correlation length in T_e turbulence is typically 5-10 times of the ion gyro-radius, similar to that in the conventional L-mode plasmas. The RMS fluctuation level of the T_e and n_e turbulence exhibits a peaking radial profile feature, and the peaks roughly coincide with the radial electric field well near ρ~0.95 inferred from the poloidal flow velocity of the n_e turbulence. Results of linear stability turbulence simulations will also be presented.