Up-down asymmetry measurement of tungsten distribution in large helical device using two extreme ultraviolet (EUV) spectrometers

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959781· OSTI ID:22596579

Zhang, H. M. ^[1]; Morita, S.; Oishi, T.; Goto, M. ^[1]; Huang, X. L. ^[2]

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1. Department of Fusion Science, Graduate University for Advanced Studies, Toki, Gifu 509-5292 (Japan)
2. National Institute for Fusion Science, Toki, Gifu 509-5292 (Japan)

Two space-resolved extreme ultraviolet spectrometers working in wavelength ranges of 10-130 Å and 30-500 Å have been utilized to observe the full vertical profile of tungsten line emissions by simultaneously measuring upper- and lower-half plasmas of LHD, respectively. The radial profile of local emissivity is reconstructed from the measured vertical profile in the overlapped wavelength range of 30-130 Å and the up-down asymmetry is examined against the local emissivity profiles of WXXVIII in the unresolved transition array spectrum. The result shows a nearly symmetric profile, suggesting a good availability in the present diagnostic method for the impurity asymmetry study.

• OSTI ID: 22596579
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASYMMETRY
AVAILABILITY
DIAGNOSTIC TECHNIQUES
DISTRIBUTION
EMISSION
EMISSIVITY
EXTREME ULTRAVIOLET RADIATION
IMPURITIES
LHD DEVICE
PLASMA
SPACE
SPECTRA
SYMMETRY
TUNGSTEN
ULTRAVIOLET SPECTROMETERS
WAVELENGTHS