Mechanisms responsible for topographical changes in PLT stainless-steel and graphite limiters

S. A. Cohen, R. Budny, G. M. McCracken, M. Ulrickson

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

PLT limiters used during Ohmic and neutral-beam heated discharges were melted and eroded. For the steel limiters, the pattern of large (20 cm2) melted areas was 0.1 — 1.0-mm ripples in a regular array. The various types of damage can be explained by the power and momentum fluxes of bulk plasma and beam ions and by disruptions. The plasma scrape-off distance inferred from the extent of the damage ranges from 5 to 30 mm and is consistent with a radially outward drift velocity of 2 X 104mm s-1. A new model of the plasma scrape-off is presented which explains pattern and extent of the damage.

Original languageEnglish (US)
Pages (from-to)233-249
Number of pages17
JournalNuclear Fusion
Volume21
Issue number2
DOIs
StatePublished - Feb 1981

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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