Simulation of main-chamber recycling in DIII-D with the UEDGE code

M. E. Rensink*, M. Groth, G. D. Porter, T. D. Rognlien, D. L. Rudakov, J. G. Watkins

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

This paper demonstrates a computer simulation model for single-null diverted plasma configurations that include simultaneous interaction of the scrape-off layer (SOL) plasma with toroidally symmetric main-chamber limiter surfaces and divertor plate surfaces. The simulations use the UEDGE code which treats the SOL plasma and recycled neutrals as two-dimensional toroidally symmetric fluids. The spatial domain can include field lines that intersect main-chamber surfaces in the far scrape-off layer, which allows the model to include simultaneous plasma contact with both divertor and main-chamber targets. Steady-state simulation results for low density L-mode plasma discharges in DIII-D show that total core fueling increases by about 70% when the limiter gap is reduced from 6 cm to 3 cm mapped to the midplane. The additional core fueling is due to neutrals which originate from the ion particle flux incident on the upper outer divertor baffle.

Original languageEnglish
Pages (from-to)816-821
Number of pages6
JournalJournal of Nuclear Materials
Volume363-365
DOIs
Publication statusPublished - 15 Jun 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • DIII-D
  • Edge modeling
  • Edge plasma
  • Limiter
  • Particle control

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