R Neu et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 5057 doi:10.1088/0953-4075/30/21/036
Observations of x-ray spectra from highly charged tungsten ions in tokamak plasmas
R Neu
, K B Fournier
, D Schlögl and J Rice§
X-ray spectra in the range 7 - 10 Å from highly charged tungsten (Z = 74) ions were observed in the tokamak ASDEX Upgrade. Lines emitted from 
to 
were identified by comparison with ab initio calculations and with the expected ionization equilibrium charge-state distribution. Most of the features in the observed spectra coincide with predicted lines. A spectral line of As I-like 
could be identified as the predominant one for plasmas with 2.5 - 3 keV central electron temperature. The calculations predict clearly separated spectral lines for Kr I-like W at about 18.4 Å and strong lines between 5.6 and 6.0 Å for all charge states under consideration that can be used for monitoring W densities in the soft x-ray region. Tungsten concentrations in the range of 
were extracted from the emissivities of spectral lines from 
and .
- PACS
-
31.15.A- Ab initio calculations
- Subjects
- Dates
-
Issue 21 (14 November 1997)
Received 9 June 1997
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Observations of x-ray spectra from highly charged tungsten ions in tokamak plasmas
R Neu et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 5057
-
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