Edge Turbulence Velocity Changes with Lithium Coating on NSTX Page: 3 of 20
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Edge Turbulence Velocity Changes with Lithium Coating on NSTX
B. Cao , S.J. Zweben2, D.P. Stotler2, M. Bell2, A.Diallo2, S.M. Kaye2, B. LeBlanc2
'Institute of Plasma Physics Chinese Academy of Sciences, Hefei 230031, China
Princeton Plasma Physics Laboratory, PO Box 451, Princeton, NJ, 08540 USA
Abstract
Lithium coating improves energy confinement and eliminates edge localized
modes in NSTX, but the mechanism of this improvement is not yet well understood. We
used the gas-puff-imaging (GPI) diagnostic on NSTX to measure the changes in edge
turbulence which occurred during a scan with variable lithium wall coating, in order to
help understand the reason for the confinement improvement with lithium. There was a
small increase in the edge turbulence poloidal velocity and a decrease in the poloidal
velocity fluctuation level with increased lithium. The possible effect of varying edge
neutral density on turbulence damping was evaluated for these cases in NSTX.I
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A. Cao, S.J. Zweben, D.P. Stotler, M. Bell, A. Diallo, S.M. Kaye and B. LeBlanc. Edge Turbulence Velocity Changes with Lithium Coating on NSTX, report, August 10, 2012; Princeton, New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc840756/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.