Modeling of ELM events and their effect on impurity enrichment

J. Hogan*, R. Colchin, D. Coster, L. Baylor, M. Fenstermacher, M. Groth, M. Wade

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Modeling of transient impurity transport during large ELMs is used to explore basic processes which may determine ELM-averaged enrichment. The b2-Eirene code (solps4), used for DIII-D geometry, suggests that a complex sequence can occur during an ELM cycle in which a transiently detached phase, with relatively low enrichment, can occur even under nominally attached conditions. A slower recovery phase then follows, in which the effect of induced scrape-off layer flows can increase in importance. The model results are compared with available fast time-scale measurements. The observed increased enrichment with higher Z is similar to trends in basic particle reflection properties. Neon recycling processes may thus introduce a significant history effect, as illustrated by analysis of continuous, unforced neon accumulation in a DIII-D discharge with a well-characterized operational history.

Original languageEnglish
Pages (from-to)1221-1228
Number of pages8
JournalJournal of Nuclear Materials
Volume313-316
DOIs
Publication statusPublished - Mar 2003
MoE publication typeA1 Journal article-refereed

Keywords

  • B2-EIRENE code
  • Boundary plasma
  • Divertor
  • Neon
  • Plasma-wall interactions
  • Recycling

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