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Understanding the multi-scale neoclassical and turbulence physics in the edgeregion (pedestal + scrape-off layer) is required in order to reliably predictperformance in future fusion devices. We explore turbulent characteristics inthe edge region from a multiscale neoclassical and turbulent XGC1 gyrokineticsimulation in a DIII-D like tokamak geometry, here excluding neutrals andcollisions. For an H-mode type plasma with steep pedestal, it is found that theelectron density fluctuations increase towards the separatrix, and stay highwell into the SOL, reaching a maximum value of $\delta n_e / \bar{n}_e \sim0.18$. Blobs are observed, born around the magnetic separatrix surface andpropagate radially outward with velocities generally less than 1 km/s. Strongpoloidal motion of the blobs is also present, near 20 km/s, consistent with $E\times B$ rotation. The electron density fluctuations show a negative skewnessin the closed field line pedestal regions, consistent with the presence of"holes", followed by a transition to strong positive skewness across theseparatrix and into the SOL. These simulations indicate that not onlyneoclassical phenomena, but also turbulence, including the blob-generationmechanism, can remain important in the steep H-mode pedestal and SOL.Qualitative comparisons will be made to experimental observations.

Pedestal and edge turbulence characteristics from an XGC1 gyrokinetic simulation