کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
271576 504997 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling of plasma/lithium-surface interactions in NSTX: Status and key issues
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
پیش نمایش صفحه اول مقاله
Modeling of plasma/lithium-surface interactions in NSTX: Status and key issues
چکیده انگلیسی

We are studying lithium sputtering, evaporation, transport, material mixing, and surface evolution for the National Spherical Torus Experiment (NSTX) for various surfaces and plasma conditions. Lithium modeling is complex, particularly for NSTX short pulse, multiple material, variable plasma conditions. Cases examined include: (1) liquid lithium divertor (LLD) with planned high heating power/low-D-recycle plasma, (2) non-pumping/high-recycle solid or liquid divertor surface, (3) Li and C impingement on a molybdenum surface. An impurity erosion/redeposition code package is the overall integration tool, with sputter yield and velocity distributions from binary collision mixed-material codes, sheath code input for NSTX boundary conditions, and inputs of plasma edge solutions from external data-calibrated plasma fluid codes. Analysis predictions are generally favorable, showing non-runaway lithium self-sputtering, acceptable net erosion (∼5 nm/s), and moderate edge (∼10%) and core plasma (∼0.1–1%) Li contamination, for the cases studied. A Mo divertor surface is significantly affected by C and Li impingement but with low core plasma contamination predicted for a high-recycle edge plasma.


► We model sputtering, transport, and surface evolution for NSTX Li and Mo surfaces.
► We use 3-D full-kinetic simulations, with low and high D recycling plasma solutions.
► An NSTX Li divertor surface is predicted to work well-from the erosion standpoint.
► A Li surface (solid or liquid) has high erosion but low core plasma contamination.
► A Mo surface can be substantially changed, in 1 s, by C and Li impingement.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fusion Engineering and Design - Volume 87, Issue 10, October 2012, Pages 1737–1740
نویسندگان
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