ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • ASDEX Upgrade Team

Research units

  • Max-Planck-Institut für Plasmaphysik
  • VTT Technical Research Centre of Finland
  • Aix-Marseille Université

Abstract

We have modelled net and gross erosion of W in low-density . l-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong . E ×. B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2-0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6-0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

Details

Original languageEnglish
Pages (from-to)423-428
JournalNuclear Materials and Energy
Volume12
Publication statusPublished - Aug 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • ASDEX Upgrade, Cross-field diffusion, ERO modelling, Particle drifts, PIC simulations, Tungsten erosion

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