ELM-induced melting: assessment of shallow melt layer damage and the power handling capability of tungsten in a linear plasma device

T.W. Morgan, G.G. Van Eden, T.M. De Kruif, M.A. van den Berg, J. Matejicek, T. Chraska, G. De Temmerman

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Tungsten samples were exposed to combined steady state and edge localised mode transient replication experiments in a linear plasma device; either in combined hydrogen plasma and high powered laser exposures at Magnum-PSI or steady state hydrogen plasma and superimposed plasma pulses created using a capacitor bank in Pilot-PSI. With each transient the surface temperature of the sample was elevated above the melting point creating a shallow molten layer. An apparent heat transport reduction in the near surface layer increases as a function of pulse number. Scanning electron microscopy analysis of the samples shows large scale grain enlargement down to several hundred to thousand micrometers below the surface as well as melt layer motion due to evaporative recoil from the molten surface. In the ITER divertor this would lead to severe embrittlement and enhanced erosion of the tungsten surface leading to reduced lifetimes for the plasma facing material.

Original languageEnglish
Article number014022
Number of pages5
JournalPhysica Scripta, Topical Volumes
VolumeT159
DOIs
Publication statusPublished - 2014

Keywords

  • DEMO
  • divertor
  • ELMs
  • ITER
  • melting
  • tungsten

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