Line analysis of EUV Spectra from Molybdenum and Tungsten Injected with Impurity Pellets in LHD
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概要
- 論文の詳細を見る
Spectroscopic data on high-Z materials for impurity diagnostics are important due to its possible use as a plasma facing component in the next generation fusion device. For this purpose molybdenum and tungsten are injected by an impurity pellet injector into the large helical device (LHD) plasmas. Emissions from such highly ionized elements mostly fall in extreme ultraviolet (EUV) and soft X-ray ranges. The EUV spectra in a range of 20-500 Å are recorded using a flat-field EUV spectrometer. The observed emissions are identified with the help of its temporal evolution and detailed analysis is done with electron temperature profiles. At high central electron temperature (∼2.2 keV) molybdenum appears as an Al-, Mg- and Na-like ionization stages. Typical examples of identified transitions are Mo XXXI 190.46 Å (3 s2 1S-3s3p 3P) and Mo XXXII 176.63 Å (3s 2S-3p 2P). For tungsten, on the other hand, three well-separated bands appear in wavelength range of 24-80 Å. The transitions around 33 Å have been tentatively identified with the help of calculated values. Most of the isolated lines on the top of pseudo-continuum bands around 50 and 60 Å are identified, and the wavelengths are compared with previous experimental studies and also with calculated values.
著者
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GOTO Motoshi
National Insitute for Fusion Science
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MORITA Shigeru
National Insitute for Fusion Science
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CHOWDHURI Malay
Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Gifu, Japan
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Nagai Keiji
Department Of Electrical Engineering Faculty Of Technology Tokyo Noko University
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Fujioka Shinsuke
Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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GOTO Motoshi
National Institute for Fusion Science, Toki 509-5292, Japan
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Nishimura Hiroaki
Institute of Laser Engineering (ILE), Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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CHOWDHURI Malay
Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Japan
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NAGAI Keiji
Department of Fusion Science, Graduate University for Advanced Studies, Toki 509-5292, Japan
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FUJIOKA Shinsuke
Institute of Laser Engineering, Osaka University, Suita 565-0871, Japan
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