OEDGE modeling of far-SOL tungsten impurity sources and screening in WEST

J. B. Maeker, J. H. Nichols, D. C. Donovan, A. Grosjean, J. Gunn, N. Fedorczak, C. Guillemaut, C. C. Klepper, E. A. Unterberg, D. C. Easley, W. E.S.T. Team

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The plasma background and impurity transport in the scrape-off layer (SOL) of the WEST tokamak are modeled for three discharges over a Psep power scan ranging between 1.5 and 2.35 MW. An extended modeling grid is used to investigate far-SOL sourcing from the WEST baffle and lower divertor. Divertor Langmuir probe data at the targets and upstream data from reciprocating Langmuir probes and interferometry/reflectometry is used to create a simulated background plasma with the OSM and EIRENE codes. W-I spectroscopic data from WEST at the lower divertor and baffle is used to estimate the sputtered W flux as an input to the impurity transport code DIVIMP. A potential mechanism for far-SOL impurities from the baffle to transport into the near-SOL is proposed and discussed in terms of the model's force balances. Analysis of simulated impurity transport showed similar impurity density at the separatrix for the mid and high-power cases despite the high-power case having 10% more sputtered W. This is explained by the combination of differing trends in the sourcing and screening with scaling power.

Original languageEnglish
Article number101309
JournalNuclear Materials and Energy
Volume33
DOIs
StatePublished - Oct 2022

Funding

This work was in part funded by the U.S. DOE under DE-SC0020414.

Keywords

  • Far-SOL
  • Impurity screening
  • Scrape-off layer
  • Tungsten impurity modeling
  • WEST

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