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

Journal Article · · IEEE Transactions on Plasma Science
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)
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Recent emphasis of tungsten (W) plasma-materialsinteractions (PMI) 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 (MDS) and diverter filterscope systems were installed, leading to a 7x 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 NIST 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 width different widths but the same center wavelength. Lastly, fast imaging of the W I 4008.75 Å spectral line with a PCO Pixelfly VGA 200/205 camera allowed for discrimination between ELMy and intra-ELM W I emission profiles with very high (~1 mm) spatial resolution.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725; FC02-04ER54698
OSTI ID:
1436931
Alternate ID(s):
OSTI ID: 1435687
Journal Information:
IEEE Transactions on Plasma Science, Vol. 46, Issue 5; ISSN 0093-3813
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

Cited By (6)

Visible spectroscopy diagnostics for tungsten source assessment in the WEST tokamak: First measurements journal October 2018
Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER journal June 2019
Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis journal August 2019
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
Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis text January 2019

Figures / Tables (10)

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TABLE I(p. 4)table TABLE I
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Fig. 8.(p. 7)figure Fig. 8.
Fig. 9.(p. 7)figure Fig. 9.

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
tungsten
lenses
plasma measurements
spectroscopy
spatial resolution
optical spectroscopy
plasma diagnostics
plasma-material interactions (PMIs)
tokamaks