Comparison of DIVIMP and EDGE2D-EIRENE tungsten transport predictions in JET edge plasmas

• Main Authors: H.A. Kumpulainen, M. Groth, M. Fontell, A.E. Jaervinen, G. Corrigan, D. Harting
• Format: Article
• Language: English
• Published: Elsevier 2020-12-01
• Series: Nuclear Materials and Energy
• Subjects: Impurity transport; Tungsten; Scrape-off layer; Monte Carlo simulation; Code validation; Joint European Torus
• Online Access: http://www.sciencedirect.com/science/article/pii/S2352179120300600
• ISSN: 2352-1791

The average tungsten concentrations in the pedestal region (cW) predicted by the Monte Carlo code DIVIMP and the coupled multi-fluid plasma/kinetic neutral code EDGE2D-EIRENE are found to agree within a factor of 2 for a range of JET-ILW L-mode and H-mode plasma conditions. Under attached divertor conditions with cW exceeding 10−6, the cW predicted by DIVIMP is consistently ~50% higher than by EDGE2D-EIRENE. In colder plasma scenarios with cW <10-6, stochastic variations exceed the systematic disagreement between the two codes. The average tungsten charge predicted by EDGE2D-EIRENE in the upstream scrape-off layer is lower by 40–50% due to the bundling of the 74 tungsten ion charge states into 6 fluid species, which explains the reduced tungsten accumulation in the main plasma compared to the DIVIMP predictions.