Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion
Abstract
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.
- Authors:
-
- General Atomics, San Diego, CA (United States)
- 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. doi: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-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.},
doi = {10.1109/TPS.2018.2797691},
journal = {IEEE Transactions on Plasma Science},
number = 5,
volume = 46,
place = {United States},
year = {2018},
month = {5}
}
Web of Science
Figures / Tables:

Works referencing / citing this record:
Visible spectroscopy diagnostics for tungsten source assessment in the WEST tokamak: First measurements
journal, October 2018
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Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER
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