Feasibility of line-ratio spectroscopy on helium and neon as edge diagnostic tool for Wendelstein 7-X

Barbui, T.; Krychowiak, M.; König, R.; Schmitz, O.; Muñoz Burgos, J. M.; Schweer, B.; Terra, A.

doi:10.1063/1.4962989

Title: Feasibility of line-ratio spectroscopy on helium and neon as edge diagnostic tool for Wendelstein 7-X

Journal Article · Tue Sep 27 04:00:00 UTC 2016 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.4962989 · OSTI ID:1327967

Barbui, T. ^[1]; Krychowiak, M. ^[2]; König, R. ^[3]; Schmitz, O. ^[4];

^[5]; Schweer, B. ^[6]; Terra, A. ^[7]

Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Engineering Physics; University of Wisconsin-Madison
Max Planck for plasmaphysics, Greifswald (Germany)
Max Planck for plasmaphysics, Greifswald (German
Univ. of Wisconsin-Madison, Madison, WI (United States). Dept. of Engineering Physics
Johns Hopkins Univ., Baltimore, MD (United States). Department of Physics and Astronomy
Ecole Royale Militaire-Koninklijke Militaire School, Brussels (Belgium). Lab. for Plasma Physics
Forschungszentrum Julich (Germany). Inst. fur Energie- und Klimaforschung-Plasmaphysik (IEK)

A beam emission spectroscopy system on thermal helium (He) and neon (Ne) has been set up at Wendelstein 7-X to measure edge electron temperature and density profiles utilizing the line-ratio technique or its extension by the analysis of absolutely calibrated line emissions. The setup for a first systematic test of these techniques of quantitative atomic spectroscopy in the limiter startup phase (OP1.1) is reported together with first measured profiles. Lastly, this setup and the first results are an important test for developing the technique for the upcoming high density, low temperature island divertor regime.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Contributing Organization:: W7-X Team

Grant/Contract Number:: SC0014210

OSTI ID:: 1327967

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (7)

Diagnostic setup for investigation of plasma wall interactions at Wendelstein 7-X Neubauer, Olaf; Biel, Wolfgang; Czymek, Guntram Fusion Engineering and Design, Vol. 96-97 https://doi.org/10.1016/j.fusengdes.2015.06.102	journal	October 2015
Hybrid time dependent/independent solution for the He I line ratio temperature and density diagnostic for a thermal helium beam with applications in the scrape-off layer-edge regions in tokamaks Muñoz Burgos, J. M.; Schmitz, O.; Loch, S. D. Physics of Plasmas, Vol. 19, Issue 1 https://doi.org/10.1063/1.3672230	journal	January 2012
Overview of diagnostic performance and results for the first operation phase in Wendelstein 7-X (invited) Krychowiak, M.; Adnan, A.; Alonso, A. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4964376	journal	October 2016
Status of electron temperature and density measurement with beam emission spectroscopy on thermal helium at TEXTOR Schmitz, O.; Beigman, I. L.; Vainshtein, L. A. Plasma Physics and Controlled Fusion, Vol. 50, Issue 11 https://doi.org/10.1088/0741-3335/50/11/115004	journal	September 2008
Bayesian modelling of a thermal helium beam for measurement of electron density and temperature in the W7-X divertor plasma Krychowiak, Maciej; Brix, Mathias; Dodt, Dirk Plasma Physics and Controlled Fusion, Vol. 53, Issue 3 https://doi.org/10.1088/0741-3335/53/3/035019	journal	February 2011
Numerical investigation of plasma edge transport and limiter heat fluxes in Wendelstein 7-X startup plasmas with EMC3-EIRENE Effenberg, F.; Feng, Y.; Schmitz, O. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa4f83	journal	January 2017
The Set of Diagnostics for the First Operation Campaign of the Wendelstein 7-X Stellarator König, Ralf; Baldzuhn, J.; Biel, W. Journal of Instrumentation, Vol. 10, Issue 10 https://doi.org/10.1088/1748-0221/10/10/P10002	journal	October 2015

Cited By (9)

Impact of magnetic islands in the plasma edge on particle fueling and exhaust in the HSX and W7-X stellarators Stephey, L.; Bader, A.; Effenberg, F. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5026324	journal	June 2018
An ultraviolet-visible-near infrared overview spectroscopy for divertor plasma diagnosis on Wendelstein 7-X Wei, Y.; Wang, E.; Liang, Y. AIP Advances, Vol. 8, Issue 8 https://doi.org/10.1063/1.5033371	journal	August 2018
Helium line ratio spectroscopy for high spatiotemporal resolution plasma edge profile measurements at ASDEX Upgrade (invited) Griener, M.; Wolfrum, E.; Cavedon, M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5034446	journal	October 2018
Evaluation of emission contributions from charge-exchange between the excited states of deuterium with He ⁺ during diagnostic of thermal helium gas beam injection and laser-induced fluorescence Muñoz Burgos, J. M.; Griener, M.; Loreau, J. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5088363	journal	June 2019
The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data Favreau, C. J.; Johnson, C. A.; Ennis, D. A. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, Issue 9 https://doi.org/10.1088/1361-6455/ab13f4	journal	April 2019
Synthetic helium beam diagnostic and underlying atomic data Zholobenko, W.; Rack, M.; Reiter, D. Nuclear Fusion, Vol. 58, Issue 12 https://doi.org/10.1088/1741-4326/aadda9	journal	September 2018
Radiative edge cooling experiments in Wendelstein 7-X start-up limiter campaign Barbui, T.; Effenberg, F.; König, R. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab18c5	journal	May 2019
First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X Effenberg, F.; Brezinsek, S.; Feng, Y. Nuclear Fusion, Vol. 59, Issue 10 https://doi.org/10.1088/1741-4326/ab32c4	journal	August 2019
Spectroscopic studies of fuel recycling and impurity behaviors in the divertor region of Wendelstein 7-X Wei, Yanling; Wang, Erhui; Liang, Yunfeng Plasma Science and Technology, Vol. 21, Issue 10 https://doi.org/10.1088/2058-6272/ab273b	journal	July 2019

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