Validation of EDGE2D-EIRENE and DIVIMP for W SOL transport in JET

H. A. Kumpulainen (Corresponding Author), M. Groth, G. Corrigan, D. Harting, F. Koechl, Aaro Järvinen, B. Lomanowski, A. G. Meigs, M. Sertoli, JET Contributors

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Tungsten sputtering rates and density profiles predicted using the edge plasma codes EDGE2D-EIRENE and DIVIMP are found to agree within a factor of 4 with measurements of neutral and singly-ionized W spectral line emission in the JET low-field side (LFS) divertor, and within a factor of 2 with SXR, VUV, and bolometric calculations of the W density in the main plasma. The edge plasma W predictions are extended to the core plasma using JINTRAC integrated core-edge modelling. Prompt redeposition of W is identified as the primary reason for the discrepancy between predicted and measured W emission in the divertor. The studied plasmas include attached divertor conditions in L-mode and type-I ELMy H-mode plasmas typical for JET. To more accurately reproduce the spectroscopically inferred W sputtering rates in EDGE2D-EIRENE, imposing the experimentally observed Be concentration of order 0.5% in the divertor is necessary. However, the W density in the main plasma is predicted to be insensitive to whether or not W is sputtered by Be at the divertor targets. Instead, the majority of the predicted core W originated in L-mode from sputtering due to fast D charge-exchange atoms at the W-coated tiles above the LFS divertor, and in H-mode due to D and W ions at the targets during ELMs.

Original languageEnglish
Article number100866
JournalNuclear Materials and Energy
Volume25
DOIs
Publication statusPublished - Dec 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Code validation
  • Fluid simulation
  • Impurity transport
  • Joint European Torus
  • Scrape-off layer
  • Spectroscopy
  • Tungsten

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