Radiative recombination and photoionization cross sections for heavy element impurities in plasmas

Trzhaskovskaya, M. B.; Nikulin, V. K.; Clark, R. E. H.

doi:10.1016/j.adt.2007.09.002

Cited by 21 publications

(19 citation statements)

References 24 publications

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“…Consequently, the fit parameters and Equation (12) allow one to obtain PCS at any value of k ≤ k max . The associated value of RRCS is readily obtainable using Equation (5).…”

Section: Resultsmentioning

confidence: 99%

“…The exact relativistic treatment of the photoionization process having regard to all multipoles of the radiative field leads to the following expressions for PCS in the i-th atomic subshell [5]:…”

Section: Methods Of Calculationsmentioning

confidence: 99%

“…Numerical methods used for calculations of integrals in Equations (8) and (11) are described at length in [7].…”

Section: Methods Of Calculationsmentioning

confidence: 99%

“…We have performed fully relativistic calculations of RRCS and PCS using the Dirac-Fock (DF) method taking into account all significant multipoles of the radiative field for a large number of the heavy element impurity ions, among which are tungsten ions with closed shells, namely, W [5]. Then, calculations of the RR rates for these highly-charged tungsten ions, with the exception of W 6+ , have been carried out in a wide temperature range [6].…”

Section: Introductionmentioning

confidence: 99%

“…The results were added to our extended unified database containing the RR and photoionization data for about 170 heavy element impurity ions occurring in fusion plasmas. New data were included in the IAEA Atomic and Molecular database [11].…”

Section: Introductionmentioning

confidence: 99%

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Radiative Recombination and Photoionization Data for Tungsten Ions. Electron Structure of Ions in Plasmas

Trzhaskovskaya

Nikulin

2015

Atoms

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Theoretical studies of tungsten ions in plasmas are presented. New calculations of the radiative recombination and photoionization cross-sections, as well as radiative recombination and radiated power loss rate coefficients have been performed for 54 tungsten ions for the range W 6+ -W 71+ . The data are of importance for fusion investigations at the reactor ITER, as well as devices ASDEX Upgrade and EBIT. Calculations are fully relativistic. Electron wave functions are found by the Dirac-Fock method with proper consideration of the electron exchange. All significant multipoles of the radiative field are taken into account. The radiative recombination rates and the radiated power loss rates are determined provided the continuum electron velocity is described by the relativistic Maxwell-Jüttner distribution. The impact of the core electron polarization on the radiative recombination cross-section is estimated for the Ne-like iron ion and for highly-charged tungsten ions within an analytical approximation using the Dirac-Fock electron wave functions. The effect is shown to enhance the radiative recombination cross-sections by < ∼ 20%. The enhancement depends on the photon energy, the principal quantum number of polarized shells and the ion charge. The influence of plasma temperature and density on the electron structure of ions in local thermodynamic equilibrium plasmas is investigated.Results for the iron and uranium ions in dense plasmas are in good agreement with previous calculations. New calculations were performed for the tungsten ion in dense plasmas on the basis of the average-atom model, as well as for the impurity tungsten ion in fusion plasmas using the non-linear self-consistent field screening model. The temperature and density dependence of the ion charge, level energies and populations are considered.Atoms 2015, 3 87

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“…Consequently, the fit parameters and Equation (12) allow one to obtain PCS at any value of k ≤ k max . The associated value of RRCS is readily obtainable using Equation (5).…”

Section: Resultsmentioning

confidence: 99%

Section: Methods Of Calculationsmentioning

confidence: 99%

“…Numerical methods used for calculations of integrals in Equations (8) and (11) are described at length in [7].…”

Section: Methods Of Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations