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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 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.

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); European Commission (EC)
Contributing Org.:
W7-X Team
OSTI Identifier:
1415400
Alternate Identifier(s):
OSTI ID: 1530094
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:
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. https://doi.org/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. https://doi.org/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. https://doi.org/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 = {2016},
month = {8}
}

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Works referenced in this record:

Filterscopes: Spectral line monitors for long-pulse plasma devices
journal, October 2008

  • Brooks, N. H.; Colchin, R. J.; Fehling, D. T.
  • Review of Scientific Instruments, Vol. 79, Issue 10
  • DOI: 10.1063/1.2957777

The Filterscope
journal, March 2003

  • Colchin, R. J.; Hillis, D. L.; Maingi, R.
  • Review of Scientific Instruments, Vol. 74, Issue 3
  • DOI: 10.1063/1.1537038

HELIOS: A helium line-ratio spectral-monitoring diagnostic used to generate high resolution profiles near the ion cyclotron resonant heating antenna on TEXTOR
journal, October 2012

  • Unterberg, E. A.; Schmitz, O.; Fehling, D. H.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4739236

A high resolution IR/visible imaging system for the W7-X limiter
journal, August 2016

  • Wurden, G. A.; Stephey, L. A.; Biedermann, C.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4960596

Synthetic plasma edge diagnostics for EMC3-EIRENE, highlighted for Wendelstein 7-X
journal, September 2016

  • Frerichs, H.; Effenberg, F.; Schmitz, O.
  • Review of Scientific Instruments, Vol. 87, Issue 11
  • DOI: 10.1063/1.4959910

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    Impact of magnetic islands in the plasma edge on particle fueling and exhaust in the HSX and W7-X stellarators
    journal, June 2018

    • Stephey, L.; Bader, A.; Effenberg, F.
    • Physics of Plasmas, Vol. 25, Issue 6
    • DOI: 10.1063/1.5026324

    First results from the implementation of the ITER diagnostic residual gas analyzer prototype at Wendelstein 7-X
    journal, September 2019

    • Schlisio, G.; Klepper, C. C.; Harris, J. H.
    • Review of Scientific Instruments, Vol. 90, Issue 9
    • DOI: 10.1063/1.5098125

    Observation of anomalous impurity transport during low-density experiments in W7-X with laser blow-off injections of iron
    journal, February 2019


    Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters
    journal, November 2019