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

Technical Report · Tue Jan 04 04:00:00 EST 2011

DOI:https://doi.org/10.2172/1001676· OSTI ID:1001676

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

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.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• OSTI ID: 1001676
• Report Number(s): PPPL-4584
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BALMER LINES
COATINGS
DEUTERIUM
DIVERTORS
ELECTRON DENSITY
LITHIUM
Lithium
NSTX
MODIFICATIONS
PLASMA
RADIATION TRANSPORT
RECOMBINATION
RECYCLING
SIMULATION
THERMODYNAMICS
TRANSPORT