Observation And Modeling Of Inner Divertor Re-attachment In Discharges With Lithium Coatings in NSTX

Scotti, Filippo ; Soukhanovskii, V. A. ; Adams, M. L. ; Scott, H. A. ; Kugel, H. W. ; Kaita, R. ; Roquemore, A. L.

Princeton University. Plasma Physics Laboratory.

关键词: Lithium, Nstx;    Modifications;    70 Plasma Physics And Fusion Technology;    Recombination;    Electron Density;   

RP-ID  :  PPPL-4584
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  1001676

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.