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.

关键词: ATOMS;    DEPOSITION;    DEUTERIUM;    ELASTIC SCATTERING;    EVAPORATION;    HELIUM;    KINETICS;    LITHIUM;    SIMULATION;    VALIDATION Computer Simulation;    Tokamak;    NSTX;   

DOI  :  10.2172/1001673
RP-ID  :  PPPL-4582
PID  :  OSTI ID: 1001673
Others  :  TRN: US1101044

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 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.