Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics

Clementson, Joel; Lennartsson, Thomas; Beiersdorfer, Peter

doi:10.3390/atoms3030407

Title: Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics

Journal Article · Wed Sep 09 00:00:00 EDT 2015 · Atoms

DOI:https://doi.org/10.3390/atoms3030407· OSTI ID:1406456

Clementson, Joel ^[1]; Lennartsson, Thomas ^[2]; Beiersdorfer, Peter ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division
Lund Univ. (Sweden). Lund Observatory

The extreme ultraviolet (EUV) emission from few-times ionized tungsten atoms has been experimentally studied at the Livermore electron beam ion trap facility. The ions were produced and confined during low-energy operations of the EBIT-I electron beam ion trap. By varying the electron-beam energy from around 30–300 eV, tungsten ions in charge states expected to be abundant in tokamak divertor plasmas were excited, and the resulting EUV emission was studied using a survey spectrometer covering 120–320 Å. It is found that the emission strongly depends on the excitation energy; below 150 eV, it is relatively simple, consisting of strong isolated lines from a few charge states, whereas at higher energies, it becomes very complex. For divertor plasmas with tungsten impurity ions, this emission should prove useful for diagnostics of tungsten flux rates and charge balance, as well as for radiative cooling of the divertor volume. Several lines in the 194–223 Å interval belonging to the spectra of five- and seven-times ionized tungsten (Tm-like W VI and Ho-like W VIII) were also measured using a high-resolution spectrometer.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1406456

Report Number(s):: LLNL-JRNL-669442; ATOMC5

Journal Information:: Atoms, Vol. 3, Issue 3; ISSN 2218-2004

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Title: Extreme Ultraviolet Spectra of Few-Times Ionized Tungsten for Divertor Plasma Diagnostics

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