EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas

Mäenpää, R.; Kumpulainen, H.; Groth, M.; Romazanov, J.; Lomanowski, B.; Brezinsek, S.; Di Genova, S.; Karhunen, J.; Lawson, K.; Meigs, A. G.; Menmuir, S.; Shaw, A.

doi:10.1016/j.nme.2022.101273

EDGE2D-EIRENE and ERO2.0 predictions of nitrogen molecular break-up and transport in the divertor of JET low-confinement mode plasmas

Journal Article · Fri Oct 07 00:00:00 EDT 2022 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2022.101273· OSTI ID:1985353

Mäenpää, R. ^[1]; Kumpulainen, H. ^[1]; Groth, M. ^[1]; Romazanov, J. ^[2]; Lomanowski, B. ^[3]; Brezinsek, S. ^[2]; Di Genova, S. ^[4]; Karhunen, J. ^[5]; Lawson, K. ^[5]; Meigs, A. G. ^[5]; Menmuir, S. ^[5]; Shaw, A. ^[5]

Aalto Univ. (Finland)
Forschungszentrum Juelich (Germany)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Aix-Marseille Univ., Marseille (France)
United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)

EDGE2D-EIRENE simulations of nitrogen-seeded partially detached JET L-mode plasmas show that the divertor N I to N V radiation distributions are highly sensitive to the upstream electron density, and less sensitive to changes in the assumed cross-field particle diffusivity for nitrogen ions. The EDGE2D-EIRENE simulations reproduce the peak intensities of N I to N V as measured by vertically viewing divertor filterscopes to within 50 % for a narrow range of the upstream electron density within the experimental uncertainties, while the predicted profiles are narrower than the measured ones. Including nitrogen atoms only in the ERO2.0 simulations implies lower N III and N IV peak intensities by one and two thirds, respectively, compared to EDGE2D-EIRENE. If nitrogen is assumed to recycle exclusively as molecules instead of atoms, ERO2.0 predicts that the N III and N IV intensities in the divertor increase by up to a factor of two and that the time-averaged, volume-integrated number of N⁵⁺ to N⁷⁺ ions in the plasma also increases by approximately a factor of 2.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: European Union; USDOE

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1985353

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Journal Issue: 1 Vol. 33; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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