A scaling relation for the ITER scrape-off layer thermal diffusivity

S. A. Cohen, Ömer Artun

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have generated an empirically based scaling relation for the thermal diffusivity, sχ, in the scrape-off layers (SOL) of tokamaks using a database of global energy confinement time versus core plasma parameters from 110 ohmically heated tokamak discharges whose core plasma parameters, viz., Te, ne, B, curvature, radial scale length, and Zeff, are similar to the values expected in the SOL of tokamaks like ITER. These data were interpreted with an all-possible-regressions model/multiple-regressions analysis to obtain the best fit for τE versus ne, Te, R, a, Zeff and V. A cylindrical-shell thermal transport model was used to extract sχ from τE. Reasons for ignoring the effects on sχ of sheath phenomena and parallel transport on open field lines are discussed.

Original languageEnglish (US)
Pages (from-to)888-893
Number of pages6
JournalJournal of Nuclear Materials
Issue numberC
StatePublished - Dec 1 1992

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • General Materials Science
  • Nuclear Energy and Engineering


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