Investigation of arcing on fiber-formed nanostructured tungsten by pulsed plasma during steady state plasma irradiation

M. Yajima, N. Ohno, S. Kajita, G. De Temmerman, K. Bystrov, S. Bardin, T.W. Morgan, S. Masuzaki

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

Abstract

Arcing on fiber-formed nanostructured tungsten samples during ELM-like pulses was investigated using the superimposition of high power pulsed plasma on a steady state plasma with hydrogen gas in the linear plasma device Pilot-PSI. The ignition of arcing was observed when the floating potential of the samples was less than −75 V with sufficient heat flux. The surface observation showed that the arc spots were not in the center, but in the peripheral area of the plasma column. Considering the plasma potential profile in the Pilot-PSI, the arcing occurred at the position where the heat flux and the sheath potential drop are sufficiently large.

Original languageEnglish
Pages (from-to)156-161
Number of pages6
JournalFusion Engineering and Design
Volume112
DOIs
Publication statusPublished - 15 Nov 2016

Keywords

  • Arcing
  • ELM
  • Fiber-formed nanostructure
  • Linear plasma device
  • Transient heat load
  • Tungsten

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