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Investigation of Lithium Behavior in Magnetic Confinement Experiments

Analysis of plasma behavior in the presence of lithium revealed intriguing results, such as reduced ion density, altered fueling efficiency, and unique heat transmission coefficients. The effects of lithium evaporation and passivation on plasma-facing components were also studied.

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Investigation of Lithium Behavior in Magnetic Confinement Experiments

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  1. 1Session II-A:Lithium in Magnetic Confinement Topical Experiments Sixpapershavebeenpresented on measurementstaken in the edgeregiontounderstand the plasma behaviour in presenceoflithium. The mainresults are: • Divertor surface pumping reduce ion density (inventory) by up to 50 % • Decreased fueling efficiency and increased target plasma temperature consistent with an actively absorbing surface (LLD) • Sheath heat transmission coefficient is measured to be 2.49 +/- 0.04. One third of the classical value, so what accounts for this discrepancy? • LLD surface shows significant signs of clamping in peak and radially averaged temperature compared to graphite where no clamping occurs • The rise in temperature of the Li is less than one would find with a simple 1-D analysis. Evaporation of Li is of interest. The work function depends on surface chemistry and impurities. • White-appearance of PFCs after evaporation suggested passivation of first layers of lithium coatings and motivated further investigation • Evidence of C on LLD due to sputtering from graphite PFCs

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