Edge Turbulence Velocity Changes with Lithium Coating on NSTX

[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. __________________________________________________

[发布日期] 2012-08-10

[学科分类] 原子、分子光学和等离子物理

[关键词] Lithium;Tokamaks;NSTX;Turbulence