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Title: Neutral recycling effects on ITG turbulence
Contributors: Stotler, D.P.
Lang, J.
Chang, C.S.
Churchill, R.M.
Ku, S.-H.
U. S. Department of Energy contract number DE-AC02-09CH11466
Keywords: Gyrokinetic simulation
Plasma turbulence
Neutral recycling
Issue Date: Aug-2017
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Nuclear Fusion, vol. 57, p. 086028 (August 2017)
Abstract: The effects 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 ExB shearing rate.
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