Observations of x-ray spectra from highly charged tungsten ions in tokamak plasmas
| Autor: | D. Schlögl, J. E. Rice, K. B. Fournier, R. Neu |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Physics
Tokamak Astrophysics::High Energy Astrophysical Phenomena chemistry.chemical_element Plasma Tungsten Condensed Matter Physics Atomic and Molecular Physics and Optics Spectral line law.invention Ion chemistry ASDEX Upgrade law Ab initio quantum chemistry methods Electron temperature Atomic physics |
| Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics. 30:5057-5067 |
| ISSN: | 1361-6455 0953-4075 |
| Popis: | X-ray spectra in the range 7 - 10 A 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 A and strong lines between 5.6 and 6.0 A 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 . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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