Development of fast helium beam emission spectroscopy on MST

J.-W. Ahn, D. Craig, G. Fiksel, D.J. Den Hartog, J.K. Anderson, M.G. O'Mullane

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2 Citations (Scopus)


Emission from an energetic neutral helium beam has been investigated as a potential localized diagnostic for the plasma parameters. A collisional-radiative model in atomic data and analysis structure was used to estimate evolutions of the atomic level populations in the beam and the beam emission intensities. It has been found that singlet lines are insensitive to the local metastable fraction and thus have been chosen to construct line ratios. The T-e and n(e) dependences of the ratios were investigated and some have been found to be sensitive to the density, but no ratios show significant sensitivity to the temperature in the range of interest for Madison symmetric torus. The theoretically expected line ratios are compared with the experimental results. It is shown that local density measurements may be possible using the singlet line ratio technique.
Original languageEnglish
Pages (from-to)10F114
Number of pages4
JournalReview of Scientific Instruments
Issue number10
Publication statusPublished - 1 Oct 2006


  • helium
  • plasma diagnostics
  • plasma-beam interactions
  • reversed field pinch
  • plasma density


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