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

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:
ORCiD logo [1] ;  [1] ;  [2] ;  [2]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Plasma Science
Additional Journal Information:
Journal Name: IEEE Transactions on Plasma Science; Journal ID: ISSN 0093-3813
Publisher:
IEEE
Research Org:
General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
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
OSTI Identifier:
1436931
Alternate Identifier(s):
OSTI ID: 1435687

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., 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. doi:10.1109/TPS.2018.2797691.
Abrams, Tyler, Thomas, Daniel M., Unterberg, Ezekial A., and Briesemeister, Alexis R.. 2018. "Advances in Low-Temperature Tungsten Spectroscopy Capability to Quantify DIII-D Divertor Erosion". United States. doi:10.1109/TPS.2018.2797691.
@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 = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}