Observation And Modeling Of Inner Divertor Re-attachment In Discharges With Lithium Coatings in NSTX
Authors: Filippo Scotti, V.A. Soukhanovskii, M.L. Adams, H.A. Scott, H. W. Kugel, R. Kaita, A.L. Roquemore
Abstract: In the National Spherical Torus Experiment (NSTX), modifications to the inner divertor plasma regimes are observed
in high triangularity, H-mode, NBI heated discharges due to lithium coatings evaporated on the plasma facing components. In particular, the drop in the recombination rate, the reduced neutral pressure and the reduced electron
density (inferred from Stark broadening measurements of high−n deuterium Balmer lines) suggested that the inner divertor, which is usually detached in discharges without lithium, re-attached. Experimental results are compared to
simulations obtained with a 1D partially ionized plasma transport model integrated in the non-local thermodynamic equilibrium radiation transport code CRETIN to understand how the reduced recycling affects the divertor parameters
in NSTX discharges with lithium coatings.
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Submitted to: Journal of Nuclear Materials (November 2010)
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