The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X

T. Barbui, S. A. Bozhenkov, F. Effenberg, C. Favreau, E. Flom, G. Fuchert, P. Drews, K. Hammond, M. Jakubowski, C. Killer, R. König, M. Krychowiak, S. Loch, J. Muñoz Burgos, E. Pasch, O. Schmitz, E. R. Scott, M. Vecsei, S. Zoletnik, T. W.X. Team

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

a versatile gas injection system and an absolute calibrated spectroscopic observation system with more than 200 lines-of-sight have been installed in two divertor locations in the Wendelstein 7-X stellarator. This powerful setup enables among other measurements to infer Te and ne in the divertor region by means of line-ratio spectroscopy on thermal helium. This is a robust and routinely used diagnostic at W7-X and this work describes its main characteristics and shows some examples of Te and ne profiles. In particular it is shown that the inclusion of high Rydberg states in the helium collisional-radiative model is necessary to obtain a realistic estimate of Te. The applicability of the diagnostic is currently being extended towards the low Te and high ne conditions occurring during detachment by means of line-ratio spectroscopy on neon. Initial Te, ne profiles obtained with a neon-beam are here presented.

Original languageEnglish
Article numberC07014
JournalJournal of Instrumentation
Volume14
Issue number7
DOIs
Publication statusPublished - Jul 30 2019

Fingerprint

Neon
neon
Helium
Spectroscopy
Diagnostics
Rydberg states
helium
gas injection
stellarators
Line
profiles
detachment
line of sight
spectroscopy
inclusions
Injection
estimates
Inclusion
Necessary
Estimate

Keywords

  • interferometry
  • Plasma diagnostics
  • Plasma diagnostics - probes
  • spectroscopy and imaging

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics

Cite this

Barbui, T., Bozhenkov, S. A., Effenberg, F., Favreau, C., Flom, E., Fuchert, G., ... Team, T. W. X. (2019). The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X. Journal of Instrumentation, 14(7), [C07014]. https://doi.org/10.1088/1748-0221/14/07/C07014

The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X. / Barbui, T.; Bozhenkov, S. A.; Effenberg, F.; Favreau, C.; Flom, E.; Fuchert, G.; Drews, P.; Hammond, K.; Jakubowski, M.; Killer, C.; König, R.; Krychowiak, M.; Loch, S.; Muñoz Burgos, J.; Pasch, E.; Schmitz, O.; Scott, E. R.; Vecsei, M.; Zoletnik, S.; Team, T. W.X.

In: Journal of Instrumentation, Vol. 14, No. 7, C07014, 30.07.2019.

Research output: Contribution to journalArticle

Barbui, T, Bozhenkov, SA, Effenberg, F, Favreau, C, Flom, E, Fuchert, G, Drews, P, Hammond, K, Jakubowski, M, Killer, C, König, R, Krychowiak, M, Loch, S, Muñoz Burgos, J, Pasch, E, Schmitz, O, Scott, ER, Vecsei, M, Zoletnik, S & Team, TWX 2019, 'The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X', Journal of Instrumentation, vol. 14, no. 7, C07014. https://doi.org/10.1088/1748-0221/14/07/C07014
Barbui, T. ; Bozhenkov, S. A. ; Effenberg, F. ; Favreau, C. ; Flom, E. ; Fuchert, G. ; Drews, P. ; Hammond, K. ; Jakubowski, M. ; Killer, C. ; König, R. ; Krychowiak, M. ; Loch, S. ; Muñoz Burgos, J. ; Pasch, E. ; Schmitz, O. ; Scott, E. R. ; Vecsei, M. ; Zoletnik, S. ; Team, T. W.X. / The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X. In: Journal of Instrumentation. 2019 ; Vol. 14, No. 7.
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AU - Flom, E.

AU - Fuchert, G.

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AU - König, R.

AU - Krychowiak, M.

AU - Loch, S.

AU - Muñoz Burgos, J.

AU - Pasch, E.

AU - Schmitz, O.

AU - Scott, E. R.

AU - Vecsei, M.

AU - Zoletnik, S.

AU - Team, T. W.X.

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