INFLUENCE OF THE ELECTRON ENERGY DISTRIBUTION FUNCTION ON THE CALCULATION OF IONIZATION RATE IN HOT PLASMA

For a radiative collisional model, population densities of atomic levels are determined by a system of equations containing the various atomic process rates. The electron impact ionization is an important atomic process in the collisional radiative model as well as for the study of ionization balance. In many types of plasmas it has been observed that some electrons (hot) are governed by a non-Maxwellian energy distribution. The illustration of the effect of a non-Maxwellian distribution is provided for neutral helium emission lines and effective ionization rate coefficients. The ionization rates are generated from cross sections obtained by the Flexible Atomic Code (FAC), weighted by this distribution. We present, in this work, the effects of hot electrons on the ionization rates of Beryllium by using a non-Maxwellian distribution of hot electrons for different fractions. We study the influence of electron energy distribution functions on the calculation of ionization rate for neutral helium using a non-Maxwellian energy distribution in the case of weak values of hot electron fractions. The use of non-Maxwellian energy distribution for different fractions of hot electrons showed the sensitivity of these rates to the fractions of hot electrons and the forms of the electron energy distribution. The results are in good agreement compared to those found in the literature.

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