Simulation of Diffusive Lithium Evaporation Onto the NSTX Vessel Walls

[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.

[发布日期] 2010-12-09

[学科分类] 原子、分子光学和等离子物理

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