Advances in low-temperature tungsten spectroscopy capability to quantify DIII-D divertor erosion

Tyler Abrams; Daniel M. Thomas; Ezekial A. Unterberg; Alexis R. Briesemeister

doi:10.1109/TPS.2018.2797691

Advances in low-temperature tungsten spectroscopy capability to quantify DIII-D divertor erosion

Tyler Abrams, Daniel M. Thomas, Ezekial A. Unterberg, Alexis R. Briesemeister

Power Exhaust and Particle Control

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26 Scopus citations

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.

Original language	English
Pages (from-to)	1298-1305
Number of pages	8
Journal	IEEE Transactions on Plasma Science
Volume	46
Issue number	5
DOIs	https://doi.org/10.1109/TPS.2018.2797691
State	Published - May 2018

Funding

Manuscript received June 22, 2017; revised January 12, 2018; accepted January 19, 2018. Date of publication February 5, 2018; date of current version May 8, 2018. This work was supported by the U.S. Department of Energy under Grant U.S. DE-FC02-04ER54698 and Grant DE-AC05-00OR22725. The review of this paper was arranged by Senior Editor E. Surrey. (Corresponding author: Tyler Abrams.) T. Abrams and D. M. Thomas are with General Atomics, San Diego, CA 92121 USA (e-mail: [email protected]).

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725, DE-FC02-04ER54698

Keywords

Optical spectroscopy
plasma diagnostics
plasma-material interactions (PMIs)
tokamaks
tungsten

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1109/TPS.2018.2797691

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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 {\AA} region, placing wavelengths within 0.1 {\AA} 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 {\AA} 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.",

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author = "Tyler Abrams and Thomas, {Daniel M.} and Unterberg, {Ezekial A.} and Briesemeister, {Alexis R.}",

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AB - 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.

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Advances in low-temperature tungsten spectroscopy capability to quantify DIII-D divertor erosion

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UN SDGs

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