Measurement of EUV spectra from high Z elements in the Large Helical Device

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Title: Measurement of EUV spectra from high Z elements in the Large Helical Device
Authors: Suzuki, C.
Kato, T.
Sakaue, H.A.
Kato, D.
Murakami, I.
Sato, K.
Tamura, N.
Sudo, S.
Yamamoto, N.
Tanuma, H.
Ohashi, H.
D'Arcy, Rebekah
Harte, Colm S.
O'Sullivan, Gerry
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Date: 21-Sep-2010
Abstract: Extreme ultra-violet (EUV) emission spectra from highly charged tin, xenon and tungsten ions have been measured in optically thin high-temperature plasmas produced in the Large Helical Device (LHD) at the National Institute for Fusion Science by using a grazing incidence spectrometer and a tracer-encapsulated solid pellet (TESPEL) injector. Quasi-continuous spectral features arising from unresolved transition array (UTA) of open 4d subshell ions were commonly observed for tin, xenon and tungsten around 13.5, 11, and 5 nm, respectively, when edge plasma was cooled enough. The spectral appearance obviously depends on edge electron temperature and atomic number. In the case of intermediate edge temperature, sharp discrete lines from highly charged open 4s or 4p subshell ions are clearly observed for tin and xenon in longer wavelength side of the UTAs but not for tungsten. Assignments of the strong discrete lines have been performed with the help of comparisons with the other experimental data and the theoretical calculations by Cowan code. Contribution of open 4f subshell ions should also be considered to interpret the whole spectra from tungsten ions.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: American Institute of Physics
Copyright (published version): 2011 American Institute of Physics
Keywords: LHDHigh Z elementsEUV spectraHighly charged ionsTinXenonTungsten
Subject LCSH: Ultraviolet spectra
Spectrum analysis
DOI: 10.1063/1.3585803
Language: en
Status of Item: Peer reviewed
Is part of: A. Bernotas, R. Karazija, Z. Rudzikas (eds.). AIP Conference Proceedings : Volume 1344 : 7th International Conference On Atomic and Molecular Data and Their Applications - ICAMDATA-2010
Conference Details: 7th International Conference On Atomic and Molecular Data and Their Applications - ICAMDATA-2010, 21–24 September 2010, Vilnius, (Lithuania)
Appears in Collections:Physics Research Collection

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