Self-organized edge density profile with turbulent pinch*

In many tokamak operations, plasma is only fueled by ionization of neutrals in the periphery which subsequently penetrate inward toward core and form a peaked density profile - a process commonly referred as density pinch. Although the Ware effect, and drift wave-/ITG-/TEM-based turbulent transport theory are proposed to explain density pinch in the core region ($r/a<0.6$), the density pinch on the edge region remains barely explored to date. We present here an edge density pinch study based on the global 3D two-fluid edge turbulence code, GDB. GDB is a flux-driven electromagnetic model self-consistently evolving plasma density, temperature as well as the sheared flow profiles in both closed-flux surfaces and the SOL. In this study, the effective simulation domain is $0.8

*This work was supported by DOE-SC-0010508. This research used resources of the National Energy Research Scientific Computing Center.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2017.DPP.YP11.11