Authors: D. P. Stotler, J. Lang, C.S.
Chang, R.M. Churchill, and S. Ku
Abstract: The e ffects of recycled neutral atoms on
tokamak ion temperature gradient (ITG) driven turbulence have been
investigated in a steep edge pedestal, magnetic separatrix
configuration, with the full-f edge gryokinetic code XGC1. Ion
temperature gradient turbulence is the most fundamental and robust
edge plasma instability, having a long radial correlation length
and an ability to impact other forms of pedestal turbulence. The
neutral atoms enhance the ITG turbulence, first, by increasing
the ion temperature gradient in the pedestal via the cooling
effects of charge exchange and, second, by a relative reduction in
the E x B shearing rate.
Submitted to: Nuclear Fusion
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