Edge transport and turbulence reduction with lithium coated plasma facing components in the National Spherical Torus Experiment

JM Canik, R Maingi, S Kubota, Y Ren, RE Bell… - Physics of …, 2011 - pubs.aip.org
The coating of plasma facing components (PFCs) with lithium improves energy confinement
and eliminates ELMs in the National Spherical Torus Experiment, the latter due to a
relaxation of the density and pressure profiles that reduces the drive for peeling-ballooning
modes. 2-D interpretive transport modeling of discharges without and with lithium shows that
a reduction in the PFC recycling coefficient from R $0.98 to R $0.90 is required to match the
drop in Da emission with lithium coatings. A broadening of the edge barrier region showing …
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