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