Observation of high-Z impurity spectra and its modeling for next-generation fusion experiment

2015 Fiscal Year Final Research Report

• Project/Area Number: 23340183
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Plasma science
• Research Institution: National Institute for Fusion Science
• Principal Investigator: MORITA Shigeru 核融合科学研究所, ヘリカル研究部, 教授 (80174423)
• Co-Investigator(Kenkyū-buntansha): GOTO Motoshi 核融合科学研究所, 大型ヘリカル研究部, 准教授 (00290916)
• Co-Investigator(Renkei-kenkyūsha): MUTO Sadatsugu 核融合科学研究所, 大型ヘリカル研究部, 助教 (40260054) ; MURAKAMI Izumi 核融合科学研究所, 大型ヘリカル研究部, 教授 (30290919) ; KATO Daiji 核融合科学研究所, 大型ヘリカル研究部, 准教授 (60370136)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: プラズマ核融合 / プラズマ計測 / プラズマ分光 / 原子分子物理 / 磁気双極子禁制線 / タングステン

Outline of Final Research Achievements

A developed high-Z impurity pellet is injected in LHD device and line emissions from such impurities are sufficiently obtained. Impurity spectra are measured with visible, VUV and EUV spectrometers in details. The unresolved transition array (UTA) is successfully observed in EUV range. The result is analyzed with developed C-R model and a good agreement is obtained. Line emissions from low-ionized tungsten, e.g. WVI, are observed for the first time in VUV range. Magnetic dipole forbidden line (M1) in visible range is also observed from tungsten ions for the first time in fusion plasmas. The wavelength is compared with theoretical values. A clear difference is observed between the experiment and theory. The result requests further improvement in the atomic structure model.

Free Research Field

プラズマ科学