# Kurchatov Institute, Russian Federation

- Institution
- Kurchatov Institute, Moscow
- Contact
- A.B. Kukushkin, V.S. Lisitsa http://vo.nfi.kiae.ru/atomic_physics
- Codes
- Description
- Calculation of n,l collisional radiative kinetics of Rydberg atomic states and line intensities can be carried out. The specific application is for charge exchange recombination spectroscopy (CXRS). A modified version of the Frequency Fluctuation Method (FFM) for line shapes is available as a code module, particularly for Stark broadening, of hydrogen atoms (to be generalized to hydrogen like ions). A semi-analytical description of Bremsstrahlung and radiative recombination cross sections for collisions of electrons with many electron atoms and ions (up to fully stripped) is available. Rosmej has developed a dense plasma quantum kinetics code with application (with Lisitsa) to non-equilibrium plasmas.

**Fast quasiclassical codes for radiative-collisional processes**^{[1]}

V.S. Lisitsa , RRC Kurchatov Institute, Moscow, Russian Federation

Fast codes for calculation of radiative-collisional processes in collisions of electrons with many-electron ions are presented. The codes are based on a quasiclassical approximation for electron motion in atomic potentials described by statistical models of the atoms (ions). Specific calculations are presented for Bremsstrahlung and radiative recombination spectra for complex ions as well as for dielectronic recombination rates for Li-like carbon ions and the Mg+1 ion. Detailed comparison with quantum calculations is presented showing quite good agreement between quasiclassical and quantum numerical data.

The advantages of quasiclassical codes are as follows:

1. Quasiclassical codes can decrease sharply the computing time as compared with quantum calculations, resulting in the possibility of their being combined with more complex plasma modeling codes, such as EIRENE or ASTRA transport codes; 2. The codes discover quasiclassical scaling laws for probabilities of radiative-collisional processes pointed above which are followed by quantum numerical data as well; it makes it possible to propose universal scaling laws for the processes applicable for every kind of multi-electron ions.

The precision of quasiclassical codes is quite good for most of plasma applications such as radiation background in tokamak plasmas as well as radiative and dielectronic recombination rates.

**References**