Simulation of Diffusive Lithium Evaporation Onto the NSTX Vessel Walls

Stotler, D. P. ; Skinner, C. H. ; Blanchard, W. R. ; Krstic, P. S. ; Kugel, H. W. ; Schneider, H. ; Zakharov, L. E.

Princeton University. Plasma Physics Laboratory.

关键词: Validation Computer Simulation, Tokamak, Nstx;    70 Plasma Physics And Fusion Technology;    Atoms;    Elastic Scattering;    Deuterium;   

RP-ID  :  PPPL-4582
RP-ID  :  DE-ACO2-09CH11466
RP-ID  :  1001673

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来源: UNT Digital Library

【 摘 要 】

A model for simulating the diffusive evaporation of lithium into a helium filled NSTX vacuum vessel is described and validated against an initial set of deposition experiments. The DEGAS 2 based model consists of a three-dimensional representation of the vacuum vessel, the elastic scattering process, and a kinetic description of the evaporated atoms. Additional assumptions are required to account for deuterium out-gassing during the validation experiments. The model agrees with the data over a range of pressures to within the estimated uncertainties. Suggestions are made for more discriminating experiments that will lead to an improved model.