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Understanding and Extending JET Plasma Modeling with Bundling Approach

Explore the advanced technique of bundling states for W in EDGE2D modeling to expand JET plasma simulation for ILW. Learn about carbon distribution, W screening, and more. Evaluate bundled calculations, C/W bundling, screening, and W sputtering for future advancements.

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Understanding and Extending JET Plasma Modeling with Bundling Approach

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  1. JET EDGE2D Modeling using W bundlingJim Strachan • EDGE2D/EIRENE fluid ions and (Monte Carlo neutrals) models the pedestal, SOL, and divertor • Used (85 publications) to model JET plasmas with carbon walls and targets • Want to extend to ILW (W targets, Be walls) • W has too many charged states for EDGE2D, so we are bundling the states together. • A Foster 2008 Ph.D. Thesis (U Strathclyde) • L Lauro-Taroni 2008 EPS • This paper describes some of our experience learning about bundling, W screening, and W sputtering. • J Strachan 2010 PSI

  2. Highly ionized charge states exist in the SOL

  3. EDGE2D correctly indicates the distribution

  4. Carbon distribution indicates modest effect of bundling

  5. W distribution indicates bundling has modest effect on charge states

  6. Screening calculation influenced at the 10% level – not significantly

  7. W SOL charge state distribution indicates 3 types of localization

  8. EDGE2D can model ELM events which are repetitive barrier events

  9. W charge state distribution before, during, and after ELM

  10. W charge state distribution before, during, and after ELM

  11. W charge state distribution before, during, and after ELM

  12. Discussion • Indicated the present status of bundled EDGE2D/EIRENE calculations • Evaluated C and W bundling • W and Be screening • W sputtering through ELMs, but all W machine • Future: • Model W spectroscopy • Add second impurity (Be, Ne, O, C) • Use W target, with Be wall • Develop models of mixed deposits

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