Effect of argon injection on the high Z impurity generation from the poloidal Inconel limiter in FTU

I. Condrea, G. Franzoni, L. Pieroni

Research output: Contribution to journalArticle

Abstract

An argon injection experiment on the Frascati Tokamak Upgrade (FTU) plasma has been utilized to clarify the physical mechanism responsible for impurity production. A simple 0-D model for the scrape-off layer (SOL), coupled with sputtering by the main deuteron flux and self-sputtering, can reproduce the variation of impurity concentration, nickel in the case of an Inconel limiter in FTU, when argon is puffed into the plasma. The increase of radiation power losses leads to a decrease of the SOL temperature, and therefore to a decrease of the sputtering yield. Zeffremains essentially unchanged by argon. All the other plasma parameters (temperature and density profiles, ohmic power and energy confinement time) also show no substantial changes. Radiation losses increase, up to 80% of the input power, at relatively high densities, with a corresponding decrease of the heat load on the limiter surface.
Original languageEnglish
Article numberI03
Pages (from-to)787 - 794
Number of pages8
JournalNuclear Fusion
Volume35
Issue number7
DOIs
Publication statusPublished - 1995
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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