UEDGE-CRUMPET predicted isotopologue effect on atomic and molecular emission in DIII-D high-recycling divertor plasmas

Andreas Holm*, Mathias Groth, Adam McLean, Filippo Scotti, Thomas D. Rognlien, William H. Meyer, Morgan W. Shafer, Robert S. Wilcox, Eric M. Hollmann

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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UEDGE-CRUMPET simulations indicate the impact of the molecular hydrogenic isotopologue effect under high-recycling LFS divertor conditions in DIII-D to be negligible for electron density and temperature profiles at the LFS target plate. A 30% decrease in molecular content, accompanied by a 10% increase in atomic content, is predicted for deuterium compared to hydrogen. The predicted isotopologue effect on the radiative power balance, validated with calibrated spectroscopy, is found to be small despite a 20% increase in LFS divertor molecular band emission for deuterium compared to hydrogen. The predictions and measurements show a negligible contribution of molecularly-induced atomic and direct molecular emission to the total radiative power balance under high-recycling conditions, consistent with previous EDGE2D-EIRENE investigations. The UEDGE-CRUMPET simulations were performed using effective hydrogen and deuterium rates considering molecular breakup and excitation processes for H2 and D2, calculated by the CRUMPET collisional-radiative model.

Original languageEnglish
Article number101337
JournalNuclear Materials and Energy
Publication statusPublished - Mar 2023
MoE publication typeA1 Journal article-refereed


  • Balmer-alpha
  • Collisional-radiative
  • DIII-D
  • Edge-fluid simulations
  • Fulcher
  • Isotope effect
  • Lyman-alpha
  • Lyman–Werner
  • Molecules


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