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

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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
Volume77
Issue number10
DOIs
Publication statusPublished - 1 Oct 2006

Fingerprint

Emission spectroscopy
Helium
helium
Plasmas
spectroscopy
data structures
Temperature
sensitivity
estimates
temperature

Keywords

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

Cite this

Ahn, J-W., Craig, D., Fiksel, G., Den Hartog, D. J., Anderson, J. K., & O'Mullane, M. G. (2006). Development of fast helium beam emission spectroscopy on MST. Review of Scientific Instruments, 77(10), 10F114. https://doi.org/10.1063/1.2236279
Ahn, J.-W. ; Craig, D. ; Fiksel, G. ; Den Hartog, D.J. ; Anderson, J.K. ; O'Mullane, M.G. / Development of fast helium beam emission spectroscopy on MST. In: Review of Scientific Instruments. 2006 ; Vol. 77, No. 10. pp. 10F114.
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Ahn, J-W, Craig, D, Fiksel, G, Den Hartog, DJ, Anderson, JK & O'Mullane, MG 2006, 'Development of fast helium beam emission spectroscopy on MST', Review of Scientific Instruments, vol. 77, no. 10, pp. 10F114. https://doi.org/10.1063/1.2236279

Development of fast helium beam emission spectroscopy on MST. / Ahn, J.-W.; Craig, D.; Fiksel, G.; Den Hartog, D.J.; Anderson, J.K.; O'Mullane, M.G.

In: Review of Scientific Instruments, Vol. 77, No. 10, 01.10.2006, p. 10F114.

Research output: Contribution to journalArticle

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T1 - Development of fast helium beam emission spectroscopy on MST

AU - Ahn, J.-W.

AU - Craig, D.

AU - Fiksel, G.

AU - Den Hartog, D.J.

AU - Anderson, J.K.

AU - O'Mullane, M.G.

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AB - 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.

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KW - plasma diagnostics

KW - plasma-beam interactions

KW - reversed field pinch

KW - plasma density

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