Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak

T. D. Rognlien, A. G. McLean, M. E. Fenstermacher, M. Groth, A. E. Järvinen, I. Joseph, C. J. Lasnier, W. Meyer, A. Moser, G. D. Porter, M. V. Umansky

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

A modeling study is reported using new 2D data from DIII-D tokamak divertor plasmas and improved 2D transport model that includes large cross-field drifts for the numerically difficult low anomalous transport regime associated with the H-mode. The data set, which spans a range of plasma densities for both forward and reverse toroidal magnetic field (Bt), is provided by divertor Thomson scattering (DTS). Measurements utilizing X-point sweeping give corresponding 2D profiles of electron temperature (Te) and density (ne) across both divertor legs for individual discharges. The simulations focus on the open magnetic field-line regions, though they also include a small region of closed field lines. The calculations show the same features of in/out divertor plasma asymmetries as measured in the experiment, with the normal Bt direction (ion ∇B drift toward the X-point) having higher ne and lower Te in the inner divertor leg than outer. Corresponding emission data for total radiated power shows a strong inner-divertor/outer-divertor asymmetry that is reproduced by the simulations. These 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalNuclear Materials and Energy
Volume12
DOIs
Publication statusPublished - Aug 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • DIII-D
  • Divertor modeling
  • UEDGE

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