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Title: Coaxial pellets for metallic impurity injection on the large helical device

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.
Authors:
;  [1] ; ; ;  [1] ;  [2]
  1. Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu (Japan)
  2. (Japan)
Publication Date:
OSTI Identifier:
22308665
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABLATION; DEPOSITION; GRAPHITE; LHD DEVICE; PELLETS; PLASMA; PLASMA IMPURITIES; POLYETHYLENES; SPECTROSCOPY; TUNGSTEN