Edge Turbulence Velocity Changes with Lithium Coating on NSTX

Cao, A. ; Zweben, S. J. ; Stotler, D. P. ; Bell, M. ; Diallo, A. ; Kaye, S. M. ; LeBlanc, B.

关键词: Lithium;    Tokamaks;    NSTX;    Turbulence;   

DOI  :  10.2172/1056824
RP-ID  :  PPPL--4789
PID  :  OSTI ID: 1056824

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

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. __________________________________________________