Modeling non-local thermodynamic equilibrium plasma using the Flexible Atomic Code data

Abstract

We present a new code, RCF("Radiative-Collisional code based on FAC"), which is used to simulate steady-state plasmas under non local thermodynamic equilibrium condition, especially photoinization dominated plasmas. RCF takes almost all of the radiative and collisional atomic processes into rate equation to interpret the plasmas systematically. The Flexible Atomic Code (FAC) supplies all the atomic data RCF needed, which insures calculating completeness and consistency of atomic data. With four input parameters relating to the radiation source and target plasma, RCF calculates the population of levels and charge states, as well as potentially emission spectrum. In preliminary application, RCF successfully reproduces the results of a photoionization experiment with reliable atomic data. The effects of the most important atomic processes on the charge state distribution are also discussed.

Bow shocks formed by a high-speed laser-driven plasma cloud interacting with a cylinder obstacle

“…was measured with a grazing-incidence spectrometer. Using a collisional-radiative (CR) model, [20,32] the electron temperature at the obstacle region is fitted to be about 90 eV, as shown in Fig. 3 We have used the USim, a two-dimension hydrodynamics code based on Euler equations, to simulate the interaction of the plasma cloud with the obstacle.…”

Electron impact excitation cross section calculations of the fine structure transitions of Mo and their applications in the diagnostics of the laser induced Mo plasma

“…where a n is the mixing co-efficient and ψ n is the CSF given as anti-symmetric product of the one-electron Dirac-Fock orbitals (Slater determinant). We obtained the atomic wave functions, mixing coefficients of each CSFs, transition energies and transition probabilities using FAC [21,22]. We compared the oscillator strengths for the emission lines understudy with the available NIST [24] data, in order to ensure the reliability of the atomic wave functions, and the comparison is presented in table 1.…”

“…We calculate the EIE cross sections from each of the manifolds 4d 5 5s, 4d 4 5s 2 , 4d 6 , and 4d 5 5p to the manifolds 4d 5 5s, 4d 4 5s 2 , 4d 6 , 4d 5 5p, 4d 4 5s5p, 4d 5 5d, 4d 5 6s, 4d 4 5s6s and 4d 5 7s with the projectile electron energies ranging from the excitation threshold to 500 eV. To obtain the cross sections, the T-matrix of the corresponding transition is evaluated using target Mo bound state wave functions calculated within the relativistic configurational interaction approach using flexible atomic code (FAC) [21,22] and continuum projectile electron wave function calculated by solving Dirac equations numerically in distorted potential.…”

Studies of x-ray emission properties of photoionized plasmas

“…In this paper we introduce a particular data set generated by our RCF code to analyze the temperature of a photoionized plasma (Han et al 2015). The atomic data used by RCF are all calculated with the flexible atomic code (FAC) (Gu 2003(Gu , 2008.…”

“…Excellent agreement was found between the computational results and the measurements-the average charge state calculated by RCF is Z 16.12 RCF á ñ = , in close agreement with the measured value of Z 16.1 0.2 exp á ñ =  . RCF was also used to study the importance of the various processes in determining the charge distribution (Han et al 2015).…”