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

doi:10.1088/1748-0221/14/07/C07014

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 journal › Article › peer-review

23 Scopus citations

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 T_e and n_e 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 T_e and n_e 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 T_e. The applicability of the diagnostic is currently being extended towards the low T_e and high n_e conditions occurring during detachment by means of line-ratio spectroscopy on neon. Initial T_e, n_e profiles obtained with a neon-beam are here presented.

Original language	English (US)
Article number	C07014
Journal	Journal of Instrumentation
Volume	14
Issue number	7
DOIs	https://doi.org/10.1088/1748-0221/14/07/C07014
State	Published - Jul 30 2019
Externally published	Yes

All Science Journal Classification (ASJC) codes

Instrumentation
Mathematical Physics

Keywords

interferometry
Plasma diagnostics
Plasma diagnostics - probes
spectroscopy and imaging

Access to Document

10.1088/1748-0221/14/07/C07014

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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. (2019). The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X. Journal of Instrumentation, 14(7), Article C07014. https://doi.org/10.1088/1748-0221/14/07/C07014

@article{baa6cde168ec48d889299ee598fd8fe5,

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

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.",

keywords = "interferometry, Plasma diagnostics, Plasma diagnostics - probes, spectroscopy and imaging",

author = "T. Barbui and Bozhenkov, \{S. A.\} and F. Effenberg and C. Favreau and E. Flom and G. Fuchert and P. Drews and K. Hammond and M. Jakubowski and C. Killer and R. K{\"o}nig and M. Krychowiak and S. Loch and \{Mu{\~n}oz Burgos\}, J. and E. Pasch and O. Schmitz and Scott, \{E. R.\} and M. Vecsei and S. Zoletnik and Team, \{T. W.X.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Max Planck Institute for Plasma Physics. Published by IOP Publishing Ltd on behalf of Sissa Medialab.",

year = "2019",

month = jul,

day = "30",

doi = "10.1088/1748-0221/14/07/C07014",

language = "English (US)",

volume = "14",

journal = "Journal of Instrumentation",

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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

TY - JOUR

T1 - The He/Ne beam diagnostic for line-ratio spectroscopy in the island divertor of Wendelstein 7-X

AU - Barbui, T.

AU - Bozhenkov, S. A.

AU - Effenberg, F.

AU - Favreau, C.

AU - Flom, E.

AU - Fuchert, G.

AU - Drews, P.

AU - Hammond, K.

AU - Jakubowski, M.

AU - Killer, C.

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.

PY - 2019/7/30

Y1 - 2019/7/30

N2 - 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.

AB - 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.

KW - interferometry

KW - Plasma diagnostics

KW - Plasma diagnostics - probes

KW - spectroscopy and imaging

UR - https://www.scopus.com/pages/publications/85072167540

UR - https://www.scopus.com/pages/publications/85072167540#tab=citedBy

U2 - 10.1088/1748-0221/14/07/C07014

DO - 10.1088/1748-0221/14/07/C07014

M3 - Article

AN - SCOPUS:85072167540

SN - 1748-0221

VL - 14

JO - Journal of Instrumentation

JF - Journal of Instrumentation

IS - 7

M1 - C07014

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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