A study of tungsten ions at lower ionization stages and impurity transport for the diagnostics of ITER edge plasmas

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800282
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Plasma science
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Oishi Tetsutarou 核融合科学研究所, ヘリカル研究部, 助教 (80442523)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 不純物輸送 / 低電離タングステン / 真空紫外分光 / ITER / 周辺プラズマ

Outline of Final Research Achievements

Vacuum ultraviolet (VUV) spectra of line emissions from tungsten ions at lower ionization stages have been measured in the Large Helical Device (LHD) using a 3m normal incidence spectrometer. It was found that W VI lines at the wavelengths of 605.926 (5d-6p), 639.683 (5d-6p), 677.722 (5d-6p), 1168.151 (6s-6p) and 1467.959 (6s-6p) Angstrom are emitted with extremely high intensity and entirely isolated from other intrinsic impurity line. The result strongly suggests that those lines may be useful for the spectroscopic study in ITER and other magnetic fusion devices with tungsten materials as the plasma facing component.

Free Research Field

プラズマ理工学