Collisional-radiative model including recombination processes for W27+ ion

  • Izumi Murakami
  • Akira Sasaki
  • Daiji Kato
  • Fumihiro Koike
Regular Article
Part of the following topical collections:
  1. Topical Issue: Atomic and Molecular Data and their Applications

Abstract

We have constructed a collisional-radiative (CR) model for W27+ ions including 226 configurations with n ≤ 9 and ł ≤ 5 for spectroscopic diagnostics. We newly include recombination processes in the model and this is the first result of extreme ultraviolet spectrum calculated for recombining plasma component. Calculated spectra in 40–70 Å range in ionizing and recombining plasma components show similar 3 strong lines and 1 line weak in recombining plasma component at 45–50 Å and many weak lines at 50–65 Å for both components. Recombination processes do not contribute much to the spectrum at around 60 Å for W27+ ion. Dielectronic satellite lines are also minor contribution to the spectrum of recombining plasma component. Dielectronic recombination (DR) rate coefficient from W28+ to W27+ ions is also calculated with the same atomic data in the CR model. We found that larger set of energy levels including many autoionizing states gave larger DR rate coefficients but our rate agree within factor 6 with other works at electron temperature around 1 keV in which W27+ and W28+ ions are usually observed in plasmas.

Graphical abstract

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Izumi Murakami
    • 1
    • 2
  • Akira Sasaki
    • 3
  • Daiji Kato
    • 1
    • 2
  • Fumihiro Koike
    • 4
  1. 1.National Institute for Fusion Science, National Institutes of Natural SciencesTokiJapan
  2. 2.Department of Fusion ScienceSOKENDAI (The Graduate University of Advanced Studies)TokiJapan
  3. 3.Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and TechnologyKizugawaJapan
  4. 4.Sophia UniversityChiyoda-kuJapan

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