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Title: Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas

Abstract

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 H α, H β, 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. Finally, 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 τ P.

Authors:
 [1]; ORCiD logo [2];  [1];  [1];  [1];  [3];  [4];  [3];  [3];  [3]; ORCiD logo [4]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Max Planck Inst. of Plasma Physics, Greifswald (Germany)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Max Planck Inst. of Plasma Physics, Greifswald (Germany)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); European Commission (EC)
Contributing Org.:
W7-X Team
OSTI Identifier:
1415400
Report Number(s):
LA-UR-17-24683
Journal ID: ISSN 0034-6748; TRN: US1800799
Grant/Contract Number:  
AC52-06NA25396; AC05-00OR22725; SC0014210; FG02-93ER54222; 633053
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; cameras; limiters; photons; plasma diagnostics; calibration

Citation Formats

Stephey, L., Wurden, G. A., Schmitz, O., Frerichs, H., Effenberg, F., Biedermann, C., Harris, J., König, R., Kornejew, P., Krychowiak, M., and Unterberg, E. A.. Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas. United States: N. p., 2016. Web. doi:10.1063/1.4959274.
Stephey, L., Wurden, G. A., Schmitz, O., Frerichs, H., Effenberg, F., Biedermann, C., Harris, J., König, R., Kornejew, P., Krychowiak, M., & Unterberg, E. A.. Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas. United States. doi:10.1063/1.4959274.
Stephey, L., Wurden, G. A., Schmitz, O., Frerichs, H., Effenberg, F., Biedermann, C., Harris, J., König, R., Kornejew, P., Krychowiak, M., and Unterberg, E. A.. Mon . "Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas". United States. doi:10.1063/1.4959274. https://www.osti.gov/servlets/purl/1415400.
@article{osti_1415400,
title = {Spectroscopic imaging of limiter heat and particle fluxes and the resulting impurity sources during Wendelstein 7-X startup plasmas},
author = {Stephey, L. and Wurden, G. A. and Schmitz, O. and Frerichs, H. and Effenberg, F. and Biedermann, C. and Harris, J. and König, R. and Kornejew, P. and Krychowiak, M. and Unterberg, E. A.},
abstractNote = {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. Finally, 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.},
doi = {10.1063/1.4959274},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Mon Aug 08 00:00:00 EDT 2016},
month = {Mon Aug 08 00:00:00 EDT 2016}
}

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