Plasma Spectroscopy on an Aluminum-Pellet Ablation Cloud in an LHD Plasma with an Echelle Spectrometer

Atoms

Hirotaka Tanaka¹  Taiichi Shikama¹  Masahiro Hasuo¹  Keisuke Fujii¹  Motoshi Goto²  Shigeru Morita² 

[1] Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 615-8540, Japan;National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu, 5909-5292, Japan;

关键词: pellet ablation plasma;    LHD;    plasma spectroscopy;    aluminum atoms and ions;    stark broadening;    echelle spectrometer;   

DOI  :  10.3390/atoms8040081

来源: DOAJ

【 摘 要 】

We developed an echelle spectrometer for the simultaneous observation of the whole visible range with a high instrumental resolution, for example, 0.055 nm (full width at the half maximum) at 400 nm and 0.10 nm at 750 nm. With the spectrometer, the emission from an ablation cloud of an aluminum pellet injected into a high-temperature plasma generated in the Large Helical Device (LHD) was measured. We separated the emission lines into Al I, II, III and IV groups, and estimated the electron temperature and density of the ablation cloud from the line intensity distribution and Stark broadening respectively, of each of the Al I, II and III groups. We also determined the Stark broadening coefficients of many Al II and III lines from the respective Stark widths with the estimated electron temperature and density.

【 授权许可】

Unknown