Dielectronic recombination rate in statistical model

Abstract

Abstract. The dielectronic recombination rate of multielectron ions was calculated by means of the statistical approach. It is based on an idea of collective excitations of atomic electrons with the local plasma frequencies. These frequencies are expressed via the Thomas-Fermi model electron density distribution. The statistical approach provides fast computation of DR rates that are compared with the modern quantum mechanical calculations. The results are important for current studies of thermonuclear plasmas with the tungsten impurities.The dielectronic recombination (DR) plays the important role in the establishing ionization equilibrium of multielectron ions in high temperature plasma. In the modern thermonuclear facilities, tungsten is used for the elements of the discharge camera. Thus, the DR rate calculations of its ions are significant for evaluation of its impurities. The detailed level-bylevel calculations of the DR rate dependence Qdr(T) on plasma temperature T for multielectron ions are a very difficult problem since for complex atoms like tungsten they require to take into account a huge number of atomic states and configurations [1]. The general expression for the DR rate represents itself the sum over branching ratios assembled from the total radiation ( ) R