Sheath heat transmission factors on TCV

J. Marki, R. A. Pitts, T. Eich, A. Herrmann, J. Horacek, F. Sanchez, G. Veres

Research output: Article

25 Citations (Scopus)

Abstract

Despite its importance in determining the calculated surface power flux predicted, for example, by scrape-off layer simulation codes, the sheath heat transmission factor, γ remains a quantity whose theoretically predicted value has rarely been tested experimentally. This contribution attempts such a test by comparing direct, infra-red measurements of the outer divertor target power fluxes in single null lower discharges on the TCV tokamak with tile embedded Langmuir probe data. A selection of L-mode plasmas have been used, including varying outer target flux expansion and a pair of matched D-He pulses. Particular care is taken to identify all possible sources of error and estimate their effect on the derived values of γ. Within the admittedly rather large uncertainty, L-mode values of γ are found to be consistent with simple sheath theory.

Original languageEnglish
Pages (from-to)382-388
Number of pages7
JournalJournal of Nuclear Materials
Volume363-365
Issue number1-3
DOIs
Publication statusPublished - jún. 15 2007

ASJC Scopus subject areas

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

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    Marki, J., Pitts, R. A., Eich, T., Herrmann, A., Horacek, J., Sanchez, F., & Veres, G. (2007). Sheath heat transmission factors on TCV. Journal of Nuclear Materials, 363-365(1-3), 382-388. https://doi.org/10.1016/j.jnucmat.2007.01.197