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1 Session II-A : Lithium in Magnetic Confinement Topical Experiments

1 Session II-A : Lithium in Magnetic Confinement Topical Experiments. Six papers have been presented on measurements taken in the edge region to understand the plasma behaviour in presence of lithium . The main results are:

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1 Session II-A : Lithium in Magnetic Confinement Topical 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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