Measurement of M-shell iron ionization balance in a tokamak plasma

K. B. Fournier*, M. Finkenthal, D. Pacella, M. J. May, M. Leigheb, V. Soukhanovskii, W. H. Goldstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We present the △n = 0 (n = 3 to n = 3) EUV spectra of M-shell iron ions from a tokamak plasma obtained during the "ramp-down" phase of the discharge. The fractional ion abundances for K-like Fe+7 to Si-like Fe+12 are found from fitting model spectra to the measured spectrum. The plasma temperature is measured as a function of position by Thomson scattering of laser light and Langmuir probes. Collisional-radiative simulations have been computed for the above ions, using atomic data generated with the HULLAC suite of codes. The blended M-shell spectrum is strongly sensitive to temperature; this makes it a potentially useful diagnostic for observations of stellar coronae where the differential emission measure is dominated by temperatures around 1 MK.

Original languageEnglish
Pages (from-to)L117-L120
JournalAstrophysical Journal
Volume550
Issue number1 PART 2
DOIs
StatePublished - 20 Mar 2001

Keywords

  • Atomic data
  • Methods: laboratory
  • Stars: coronae
  • Ultraviolet: stars

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