EDGE2D-EIRENE predictions of molecular emission in DIII-D high-recycling divertor plasmas

M. Groth*, B. Lomanowski, the DIII-D team

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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The contributions of deuterium molecular emission to the total deuterium radiation was assessed in DIII-D ohmically-confined plasmas in high-recycling divertor conditions. Radial profiles of the deuterium Ly-α line intensity across the low-field side divertor leg were obtained with the recently installed divertor Survey Poor Resolution, Extended Spectrometer [1]. A high-resolution spectrometer was used to measure the poloidal profiles of the deuterium Balmer-α and the deuterium Fulcher-α band intensity in the visible wavelength range. The scrape-off layer plasma and neutral distributions were simulated using the edge fluid EDGE2D-EIRENE [2], and the numerical solutions constrained utilizing Thomson scattering and Langmuir probe measurements at the low-field side midplane and the divertor target plate. The studies show that for these conditions molecular emission plays a negligible role in the total radiative power balance of the low-field side divertor, but molecular processes are important when evaluating deuterium Balmer-α line intensity for code-experiment validation.

Original languageEnglish
Pages (from-to)211-217
Number of pages7
JournalNuclear Materials and Energy
Publication statusPublished - 1 May 2019
MoE publication typeA1 Journal article-refereed


  • Deuterium atomic and molecular emission
  • DIII-D
  • Divertor edge fluid simulations
  • Lyman-Werner and Fulcher band


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