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Title: Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis

Abstract

A spectral survey of tungsten emission in the ultraviolet region has been completed in the DIII-D tokamak and the CTH torsatron to assess the potential benefit of UV emission for the diagnosis of gross W erosion. Here, a total of 29 W I spectral lines are observed from the two experiments using survey spectrometers between 200 and 400 nm with level identifications provided based on a structure calculation for many of the excited states that produce strong emission lines. Of the 29 observed lines, 20 have not previously been reported in fusion relevant plasmas, including an intense line at 265.65 nm which could be important for benchmarking the frequently exploited line at 400.88 nm. Nearly all of the observed spectral lines decay down to one of the six lowest energy levels for neutral W, which are likely to be long-lived metastable states. The impact of metastable level populations on the W I emission spectrum and any erosion measurement utilizing a spectroscopic technique is potentially significant. Yet, the high density of W I emission in the UV region allows for the possibly of determining the relative metastable fractions and plasma parameters local to the erosion region. Additionally, the lines observed inmore » this work could be used to perform multiple independent gross erosion measurements, leading to more accurate diagnosis of gross tungsten erosion.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [3]; ORCiD logo [4];  [5]
+ Show Author Affiliations
  1. Auburn Univ., AL (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Queen's Univ., Belfast, Northern Ireland (United Kingdom)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Auburn Univ., AL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1569476
Alternate Identifier(s):
OSTI ID: 1561607; OSTI ID: 1874104
Report Number(s):
LLNL-JRNL-779519
Journal ID: ISSN 0741-3335; TRN: US2100322
Grant/Contract Number:  
FC02-04ER54698; SC0015877; AC52-07NA27344; AC05-00OR22725; FG02-00ER54610
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 61; Journal Issue: 9; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; erosion; tungsten; plasma facing components; ultraviolet; spectroscopy; S/XB; metastable states

Citation Formats

Johnson, C. A., Ennis, D. A., Loch, S. D., Hartwell, G. J., Maurer, D. A., Allen, S. L., Victor, B. S., Samuell, C. M., Abrams, T., Unterberg, E. A., and Smyth, R. T. Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis. United States: N. p., 2019. Web. doi:10.1088/1361-6587/ab2b25.
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Johnson, C. A., Ennis, D. A., Loch, S. D., Hartwell, G. J., Maurer, D. A., Allen, S. L., Victor, B. S., Samuell, C. M., Abrams, T., Unterberg, E. A., & Smyth, R. T. Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis. United States. https://doi.org/10.1088/1361-6587/ab2b25
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Johnson, C. A., Ennis, D. A., Loch, S. D., Hartwell, G. J., Maurer, D. A., Allen, S. L., Victor, B. S., Samuell, C. M., Abrams, T., Unterberg, E. A., and Smyth, R. T. Mon . "Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis". United States. https://doi.org/10.1088/1361-6587/ab2b25. https://www.osti.gov/servlets/purl/1569476.
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@article{osti_1569476,
title = {Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis},
author = {Johnson, C. A. and Ennis, D. A. and Loch, S. D. and Hartwell, G. J. and Maurer, D. A. and Allen, S. L. and Victor, B. S. and Samuell, C. M. and Abrams, T. and Unterberg, E. A. and Smyth, R. T.},
abstractNote = {A spectral survey of tungsten emission in the ultraviolet region has been completed in the DIII-D tokamak and the CTH torsatron to assess the potential benefit of UV emission for the diagnosis of gross W erosion. Here, a total of 29 W I spectral lines are observed from the two experiments using survey spectrometers between 200 and 400 nm with level identifications provided based on a structure calculation for many of the excited states that produce strong emission lines. Of the 29 observed lines, 20 have not previously been reported in fusion relevant plasmas, including an intense line at 265.65 nm which could be important for benchmarking the frequently exploited line at 400.88 nm. Nearly all of the observed spectral lines decay down to one of the six lowest energy levels for neutral W, which are likely to be long-lived metastable states. The impact of metastable level populations on the W I emission spectrum and any erosion measurement utilizing a spectroscopic technique is potentially significant. Yet, the high density of W I emission in the UV region allows for the possibly of determining the relative metastable fractions and plasma parameters local to the erosion region. Additionally, the lines observed in this work could be used to perform multiple independent gross erosion measurements, leading to more accurate diagnosis of gross tungsten erosion.},
doi = {10.1088/1361-6587/ab2b25},
journal = {Plasma Physics and Controlled Fusion},
number = 9,
volume = 61,
place = {United States},
year = {2019},
month = {8}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1361-6587/ab2b25
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Figures / Tables:

Figure 1 Figure 1: UV survey spectrometer lines of sight viewing the DIII-D tokamak divertor highlighted in green and overlaid on a reconstruction of magnetic flux surfaces. Two toroidally displaced UV lenses provide independent views that can be aligned to tungsten coated inserts on either the divertor floor or shelf. The locationmore » of a Langmuir probe on the divertor shelf is shown in red.« less
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Works referenced in this record:

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    Works referencing / citing this record:

    ERO modeling and analysis of tungsten erosion and migration from a toroidally symmetric source in the DIII-D divertor
    journal, November 2019

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      Figures / Tables found in this record:

      Figure 1 (p. 3)figure
      Figure 2 (p. 3)figure
      Figure 3 (p. 5)figure
      Figure 4 (p. 5)figure
      Table 1 (p. 6)table
      Figure 5 (p. 7)figure
      Figure 6 (p. 8)figure
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