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Title: Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion

Abstract

Recent emphasis of tungsten (W) plasma–material interaction experiments on DIII-D has made it essential to enhance the W I and W II measurement capabilities of its spectroscopy diagnostic suite to acquire W sourcing measurements with high temporal, spatial, and wavelength resolution. To this end, four new viewing chords for the multichordal divertor spectrometer and divertor filterscope systems were installed, leading to a 7× increase in blue-light sensitivity. W I and low-Z impurity line identifications were performed in the 3995–4030 Å region, placing wavelengths within 0.1 Å of the National Institute of Standards and Technology values. A novel method was also developed for the DIII-D high-temporal resolution filterscopes to distinguish between W I light and background contamination, important due to the relatively weak intensity of this line, using two different bandpass filters with different widths but the same center wavelength. Finally, fast imaging of the W I 4008.75 Å spectral line with a PCO Pixelfly VGA 200/205 camera is allowed for discrimination between intra-edge-localized mode (ELM) and inter-ELM W I emission profiles with very high (~1 mm) spatial resolution.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [2]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1436931
Alternate Identifier(s):
OSTI ID: 1435687
Grant/Contract Number:  
AC05-00OR22725; FC02-04ER54698
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Volume: 46; Journal Issue: 5; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tungsten; lenses; plasma measurements; spectroscopy; spatial resolution; optical spectroscopy; plasma diagnostics; plasma-material interactions (PMIs); tokamaks

Citation Formats

Abrams, Tyler, Thomas, Daniel M., Unterberg, Ezekial A., and Briesemeister, Alexis R. Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion. United States: N. p., 2018. Web. https://doi.org/10.1109/TPS.2018.2797691.
Abrams, Tyler, Thomas, Daniel M., Unterberg, Ezekial A., & Briesemeister, Alexis R. Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion. United States. https://doi.org/10.1109/TPS.2018.2797691
Abrams, Tyler, Thomas, Daniel M., Unterberg, Ezekial A., and Briesemeister, Alexis R. Tue . "Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion". United States. https://doi.org/10.1109/TPS.2018.2797691. https://www.osti.gov/servlets/purl/1436931.
@article{osti_1436931,
title = {Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion},
author = {Abrams, Tyler and Thomas, Daniel M. and Unterberg, Ezekial A. and Briesemeister, Alexis R.},
abstractNote = {Recent emphasis of tungsten (W) plasma–material interaction experiments on DIII-D has made it essential to enhance the W I and W II measurement capabilities of its spectroscopy diagnostic suite to acquire W sourcing measurements with high temporal, spatial, and wavelength resolution. To this end, four new viewing chords for the multichordal divertor spectrometer and divertor filterscope systems were installed, leading to a 7× increase in blue-light sensitivity. W I and low-Z impurity line identifications were performed in the 3995–4030 Å region, placing wavelengths within 0.1 Å of the National Institute of Standards and Technology values. A novel method was also developed for the DIII-D high-temporal resolution filterscopes to distinguish between W I light and background contamination, important due to the relatively weak intensity of this line, using two different bandpass filters with different widths but the same center wavelength. Finally, fast imaging of the W I 4008.75 Å spectral line with a PCO Pixelfly VGA 200/205 camera is allowed for discrimination between intra-edge-localized mode (ELM) and inter-ELM W I emission profiles with very high (~1 mm) spatial resolution.},
doi = {10.1109/TPS.2018.2797691},
journal = {IEEE Transactions on Plasma Science},
number = 5,
volume = 46,
place = {United States},
year = {2018},
month = {5}
}

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Cited by: 5 works
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Figures / Tables:

Fig. 1. Fig. 1.: Schematic of the collection lens, collimation optics, and pellicle beamsplitter system used to efficiently couple equal light intensity to the filterscope and MDS fiber optics.

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Works referencing / citing this record:

Visible spectroscopy diagnostics for tungsten source assessment in the WEST tokamak: First measurements
journal, October 2018

  • Meyer, O.; Giacalone, J. C.; Gouin, A.
  • Review of Scientific Instruments, Vol. 89, Issue 10
  • DOI: 10.1063/1.5035566

Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER
journal, June 2019

  • Abrams, T.; Unterberg, E. A.; Rudakov, D. L.
  • Physics of Plasmas, Vol. 26, Issue 6
  • DOI: 10.1063/1.5089895

Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis
journal, August 2019

  • Johnson, C. A.; Ennis, D. A.; Loch, S. D.
  • Plasma Physics and Controlled Fusion, Vol. 61, Issue 9
  • DOI: 10.1088/1361-6587/ab2b25

Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges
journal, October 2019


Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D
journal, November 2019