Pedestal Turbulence Evolution After L-H Transition and During ELM Cycles on DIII-D

High-resolution quadrature reflectometer density fluctuation measurements ($\tilde n_e$) have been obtained on DIII-D during H-mode pedestal studies. Initial results indicate that turbulence evolution after the L-H transition and prior to the first ELM appears dependent on pedestal beta ($\beta_{ped}$); in high $\beta_{ped}$ discharges, there is a significant increase in both local $\tilde n_e$ and magnetic turbulence (as observed on magnetic loops) leading up to the first ELM, while the turbulence in low $\beta_{ped}$ discharges shows little change. This $\beta_{ped}$ dependence suggests electromagnetic effects on pedestal turbulence. Later during Type-I ELM cycles two cases are observed: a low level of magnetic turbulence together with an increased $\tilde n_e$ level just after the ELM crash, and high magnetic fluctuation levels with a decrease in $\tilde n_e$ after the ELM crash. Comparisons will be made with electromagnetic turbulence models.