A combined IR and visible camera system [G. A. Wurden et al., “A high resolution IR/visible imaging system for the W7-X limiter,” Rev. Sci. Instrum. (these proceedings)] and a filterscope system [R. J. Colchin et al., Rev. Sci. Instrum. 74, 2068 (2003)] were implemented together to obtain spectroscopic data of limiter and first wall recycling and impurity sources during Wendelstein 7-X startup plasmas. Both systems together provided excellent temporal and spatial spectroscopic resolution of limiter 3. Narrowband interference filters in front of the camera yielded C-III and Hα photon flux, and the filterscope system provided Hα, Hβ, He-I, He-II, C-II, and visible bremsstrahlung data. The filterscopes made additional measurements of several points on the W7-X vacuum vessel to yield wall recycling fluxes. The resulting photon flux from both the visible camera and filterscopes can then be compared to an EMC3-EIRENE synthetic diagnostic [H. Frerichs et al., “Synthetic plasma edge diagnostics for EMC3-EIRENE, highlighted for Wendelstein 7-X,” Rev. Sci. Instrum. (these proceedings)] to infer both a limiter particle flux and wall particle flux, both of which will ultimately be used to infer the complete particle balance and particle confinement time τP.
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November 2016
Research Article|
August 08 2016
Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas
L. Stephey;
L. Stephey
a)
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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G. A. Wurden
;
G. A. Wurden
2
Los Alamos National Laboratory
, Los Alamos, New Mexico 87545, USA
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O. Schmitz;
O. Schmitz
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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H. Frerichs;
H. Frerichs
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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F. Effenberg;
F. Effenberg
1
University of Wisconsin–Madison
, Madison, Wisconsin 53706, USA
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C. Biedermann;
C. Biedermann
3
Max-Planck-Institut für Plasma Physik
, Wendelsteinstrasse 1, 17491 Greifswald, Germany
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J. Harris;
J. Harris
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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R. König;
R. König
3
Max-Planck-Institut für Plasma Physik
, Wendelsteinstrasse 1, 17491 Greifswald, Germany
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P. Kornejew;
P. Kornejew
3
Max-Planck-Institut für Plasma Physik
, Wendelsteinstrasse 1, 17491 Greifswald, Germany
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M. Krychowiak;
M. Krychowiak
3
Max-Planck-Institut für Plasma Physik
, Wendelsteinstrasse 1, 17491 Greifswald, Germany
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E. A. Unterberg
;
E. A. Unterberg
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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a)
Electronic mail: stephey@wisc.edu
b)
Members of the W7-X Team are listed in H. S. Bosch et al., J. Nucl. Fusion 53, 126001 (2013).
Contributed paper, published as part of the Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, Wisconsin, USA, June 2016.
Rev. Sci. Instrum. 87, 11D606 (2016)
Article history
Received:
June 04 2016
Accepted:
June 24 2016
Citation
L. Stephey, G. A. Wurden, O. Schmitz, H. Frerichs, F. Effenberg, C. Biedermann, J. Harris, R. König, P. Kornejew, M. Krychowiak, E. A. Unterberg, W7-X Team; Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas. Rev. Sci. Instrum. 1 November 2016; 87 (11): 11D606. https://doi.org/10.1063/1.4959274
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