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Development of an experimental database of EUV spectra from highly charged ions of medium to high Z elements in the Large Helical Device plasmas |
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| Authors: | Chihiro Suzuki Izumi Murakami Fumihiro Koike Takeshi Higashiguchi Hiroyuki A Sakaue Naoki Tamura Shigeru Sudo Gerry O'Sullivan |
| Institution: | 1. Department of Helical Plasma Research, National Institute for Fusion Science, Toki, Japan;2. Department of Helical Plasma Research, National Institute for Fusion Science, Toki, Japan
Department of Fusion Science, SOKENDAI (The Graduate University for Advanced Studies), Toki, Japan;3. Faculty of Science and Technology, Sophia University, Chiyoda, Japan;4. Faculty of Engineering, Utsunomiya University, Utsunomiya, Japan;5. College of Engineering, Chubu University, Kasugai, Japan;6. School of Physics, University College Dublin, Dublin, Ireland |
| Abstract: | We are developing an experimental database of extreme ultraviolet spectra from highly charged ions using optically thin high-temperature plasmas produced in the Large Helical Device. Spectra from a variety of elements with atomic numbers ranging from 36 to 83 have been systematically recorded in the range of 1–20 nm by a grazing incidence spectrometer. For higher Z elements from tin onward, discrete or quasicontinuum spectral features from n=4 (N-shell) ions are mainly observed depending upon the plasma temperature, which leads to some new experimental identifications of spectral lines. On the other hand, major emitters are n=3 (M-shell) ions for medium Z elements from krypton to ruthenium. The calculated wavelengths for Δn≠0 transitions agree well with the measurements and the calculated wavelengths are systematically shifted to shorter wavelengths for Δn=0 transitions associated with inner-subshell excited configurations. |
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