N=5 to n=5 soft-x-ray emission of uranium in a high-temperature low-density tokamak plasma

Kevin B. Fournier*, M. Finkenthal, S. Lippmann, C. P. Holmes, H. W. Moos, W. H. Goldstein, A. L. Osterheld

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The soft-x-ray uranium emission in the 60200- range recorded from a high-temperature (1 keV) low-density (1013 cm-3) tokamak plasma has been analyzed by comparison with theoretical level structure and line-intensity calculations. In an extension of previous work [Finkenthal et al., Phys. Rev. A 45, 5846 (1992)], theoretical U xxv, U xxx, U xxxi, and U xxxii n=5 to n=5 spectra have been computed for the relevant plasma parameters. Fully relativistic parametric potential computer codes have been used for the ab initio atomic-structure calculations, and electron-impact excitation rates have been computed in the distorted-wave approximation. 5s-5p spectral lines and quasicontinua of U xxx, U xxxi, and U xxxii are identified in the 165200- wavelength band. An unambiguous line identification is hampered by theoretical uncertainties and the blending of emission from adjacent charge states.

Original languageEnglish
Pages (from-to)3727-3733
Number of pages7
JournalPhysical Review A
Volume50
Issue number5
DOIs
StatePublished - 1994
Externally publishedYes

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