Ionization state, excited populations and emission of impurities in dynamic finite density plasmas: I. The generalized collisional–radiative model for light elements

By H. Summers, W. J. Dickson, M. O’Mullane, N. Badnell, A. Whiteford, D. Brooks, J. Lang, S. Loch, D. C. G. U. O. Strathclyde, UK George Mason University and 4 more. 2005

217 citations recorded by the source corpus.

The paper presents an integrated view of the population structure and its role in establishing the ionization state of light elements in dynamic, finite density, laboratory and astrophysical plasmas. There are four main issues, the generalized collisional–radiative picture for metastables in dynamic plasmas with Maxwellian free electrons and its particularizing to light elements, the methods of bundling and projection for manipulating the population equations, the systematic production/use of state selective fundamental collision data in the metastable resolved picture to all levels for collisonal–radiative modelling and the delivery of appropriate derived coefficients for experiment analysis. The ions of carbon, oxygen and neon are used in illustration. The practical implementation of the methods described here is part of the ADAS Project.

Subfields: Atomic and Molecular Physics, and Optics, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/8e6870690229013a6099f32b59d1bd5a1e02647a

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In Atomic and Molecular Physics, and Optics

1. E. Landi
2. N. Badnell
3. Randall K. Smith
4. P. Bryans
5. N. Brickhouse
6. A. Foster
7. D. Savin
8. Li Ji

In Mechanics of Materials

1. E. Landi
2. Randall K. Smith
3. P. Bryans
4. N. Brickhouse
5. A. Foster
6. D. Savin
7. Li Ji
8. G. D. Zanna

Citations in the corpus

• A NEW APPROACH TO ANALYZING SOLAR CORONAL SPECTRA AND UPDATED COLLISIONAL IONIZATION EQUILIBRIUM CALCULATIONS. II. UPDATED IONIZATION RATE COEFFICIENTS (2008, background): “For a thorough discussion of plasma conditions where one must treat the time scales and density effects more carefully, we direct the reader to Summers et al. (2006).”
• UPDATED ATOMIC DATA AND CALCULATIONS FOR X-RAY SPECTROSCOPY (2012, background): “A full discussion of these timescales is presented in Summers et al. (2006), but it is sufficient here to note that τg ∼ τm ≫ τo ≫ τa ≫ τee, where timescales for change are: τg - the ground state ion population (typically due to ionization or recombination processes); τm - metastable states (those…”
• A new experimental classification of divertor detachment in ASDEX Upgrade (2013, methodology): “The PECs are the so-called photon emissivity coefficients for recombination and excitation and have been calculated for various elements and transitions by the ADAS project1 based on a collisional-radiative model [29].”
• Radiative Recombination Data for Modeling Dynamic Finite-Density Plasmas (2006, methodology): “…a separation between the two is no longer possible and level populations, effective recombination and ionization rate coefficients, and ionization balance are determined by solving the collisionalYradiative population rate equations (Bates et al. 1962; Burgess & Summers 1969; Summers et al. 2006).”