Modeling of ELM events and their effect on impurity enrichment

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

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

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
Issue numberSUPPL.
DOIs
StatePublished - Mar 2003
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: May 26 2002May 31 2002

Funding

The B2-Eirene code is provided by the B2-Eirene development group: R. Schneider, D. Coster, X. Bonnin (IPP-Garching, Greifswald) and D. Reiter, P. Boerner (FZ-Juelich). This research was sponsored in part by the Office of Fusion Energy Sciences, US Department of Energy, under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory managed by UT-Battelle, LLC.

Keywords

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

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