Coaxial pellets for metallic impurity injection on the large helical device

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4892440· OSTI ID:22308665

Zhang, H. M. ^[1]; Morita, S.; Oishi, T.; Goto, M. ^[1]

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

Two coaxial pellets with tungsten inserted into graphite carbon and polyethylene (PE) tubes are compared for tungsten spectroscopic study in the Large Helical Device. The tungsten pellet with carbon tube causes plasma collapse, while that with PE tube smoothly ablates without collapse. The deposition profile of the pellets is analyzed with a help of pellet ablation spectroscopy. It is found that the tungsten pellet with carbon tube can significantly penetrate into the core plasma and leads to the plasma collapse. A tungsten spectrum with radial profile is successfully observed when the tungsten pellet with PE tube is used.

• OSTI ID: 22308665
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABLATION
DEPOSITION
GRAPHITE
LHD DEVICE
PELLETS
PLASMA
PLASMA IMPURITIES
POLYETHYLENES
SPECTROSCOPY
TUNGSTEN