Collisional-radiative modeling of the L-shell emission of [Formula Presented] to [Formula Presented] emitted from a high-temperature–low-density tokamak plasma

K.B. Fournier, W.H. Goldstein, D. Pacella, R. Bartiromo, M. Finkenthal, M. May

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Abstract

The x-ray spectra of several highly stripped molybdenum ions have been recorded between 0.6 and 5.5 Å in the Frascati tokamak upgrade with a rotating crystal spectrometer. Detailed, quasi-steady-state collisional-radiative models have been used to interpret emission features from inner shell, electron impact excitations in molybdenum ions near the neonlike charge state and to characterize the charge state distribution in the plasma. Processes such as resonant excitation, excitation autoionization, and dielectronic recombination have been included in the models of the molybdenum ions’ emission features. Introducing the excitation-autoionization process into ionization equilibrium calculations brings agreement between observations and calculations of the relative ionization equilibrium fractions of highly stripped molybdenum ions. Absolutely calibrated spectra and detailed models for the excitation processes in these molybdenum ions allow us to calculate crucial plasma parameters, such as the concentration of impurity ions in the plasma and the amount of power lost from the plasma through impurity line radiation. © 1996 The American Physical Society.
Original languageEnglish
Pages (from-to)1084 - 1093
Number of pages10
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume53
Issue number1
DOIs
Publication statusPublished - 1996
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

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