Scrape-off layer flows with pressure gradient scale length ∼ρp

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Abstract

A heuristic model for the plasma scrape-off width balances magnetic drifts against parallel loss at cs/2, resulting in a SOL width ∼ρp. Tsep is calculated from Spitzer-Härm parallel thermal conduction. This results in a prediction for the power scrape-off width in quantitative agreement both in magnitude and scaling with recent experimental data. To achieve the ∼cs/2 flow assumed in this model and measured experimentally sets requirements on the ratio of upstream to total SOL particle sources, relative to the square-root of the ratio of target to upstream temperature. The Pfisch-Schlüter model for equilibrium flows has been modified to allow near-sonic flows, appropriate for gradient scale lengths of order pp, resulting in a new quadrupole radial flow pattern. The strong parallel flows and plasma charging implied by this model suggest a mechanism for H-mode transition, consistent with many observations.

Original languageEnglish (US)
Pages (from-to)S372-S374
JournalJournal of Nuclear Materials
Volume438
Issue numberSUPPL
DOIs
StatePublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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