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Atoms 2018, 6(2), 24; https://doi.org/10.3390/atoms6020024

Systematic Observation of EUV Spectra from Highly Charged Lanthanide Ions in the Large Helical Device

1
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2
Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
3
SOKENDAI (The Graduate University for Advanced Studies), Shonan Village, Hayama 240-0193, Japan
4
Chubu University, 1200 Matsumoto-cho, Kasugai 487-8501, Japan
*
Author to whom correspondence should be addressed.
Received: 27 March 2018 / Revised: 24 April 2018 / Accepted: 25 April 2018 / Published: 1 May 2018
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Abstract

We have systematically observed extreme ultraviolet (EUV) spectra from highly charged ions of nine lanthanide elements with atomic numbers from 60–70 in optically thin plasmas produced in the Large Helical Device (LHD). Discrete spectral features with isolated lines from relatively higher charge states around Cu-like ions are observed under high temperature conditions around 2 keV, while narrowed quasicontinuum features from charge states around Ag-like ions are observed under low temperature conditions below 1 keV. The positions of the lines and the quasicontinuum features systematically move to shorter wavelengths as the atomic number increases. The wavelengths of the main peaks in the quasicontinuum features agree well with those of singlet transitions of Pd-like ions reported previously. We have easily identified discrete spectral lines from Cu-like and Ag-like ions, some of which are experimentally identified for the first time in the LHD. Their wavelengths are compared with theoretical calculations using a GRASP family of atomic codes. The theoretical values are synthesized to the LHD experimental data for the cases of Ag- and Pd-like ions. View Full-Text
Keywords: lanthanides; EUV spectrum; highly charged ions; UTA; LHD; GRASP lanthanides; EUV spectrum; highly charged ions; UTA; LHD; GRASP
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Suzuki, C.; Koike, F.; Murakami, I.; Tamura, N.; Sudo, S. Systematic Observation of EUV Spectra from Highly Charged Lanthanide Ions in the Large Helical Device. Atoms 2018, 6, 24.

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