Modeling of plasma/lithium-surface interactions in NSTX: Status and key issues

J. N. Brooks, A. Hassanein, T. Sizyuk, J. P. Allain

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1737-1740
Number of pages4
JournalFusion Engineering and Design
Volume87
Issue number10
DOIs
StatePublished - Oct 2012
Externally publishedYes

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Callosities
Plasmas
Edema Disease of Swine
Lithium
Common Bile Duct Diseases
Experiments
Traffic Accidents
Accident Prevention
Birth Certificates
Acridine Orange
Sputtering
Erosion
Contamination
Liquids
Berkelium
Lutheran Blood-Group System
Cholestenones
Fecal Impaction
Butylene Glycols
Cestoda

Keywords

  • Erosion
  • Lithium
  • NSTX
  • Plasma material interactions

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Civil and Structural Engineering
  • Mechanical Engineering

Cite this

Modeling of plasma/lithium-surface interactions in NSTX : Status and key issues. / Brooks, J. N.; Hassanein, A.; Sizyuk, T.; Allain, J. P.

In: Fusion Engineering and Design, Vol. 87, No. 10, 10.2012, p. 1737-1740.

Research output: Contribution to journalArticle

Brooks, J. N.; Hassanein, A.; Sizyuk, T.; Allain, J. P. / Modeling of plasma/lithium-surface interactions in NSTX : Status and key issues.

In: Fusion Engineering and Design, Vol. 87, No. 10, 10.2012, p. 1737-1740.

Research output: Contribution to journalArticle

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