Simulation Of Atomic Coefficient And Radiation Losses Of Impurity Using Non-coronal Model On HL-2A

As we know, radiation losses of light impurities are of great importance for a future fusion reactor. The role of impurity radiation in the reduction of heat loads on wall and divertor plates in present experiment(such as DIII-D, JET, JT-60, ASDEX, and Alcator C-Mod) and in planned experiment (such as ITER and TPX) places a new degree of importance on the accuracy of impurity radiation emission rates for electron temperatures below 250eV for ITER and below 150eV for present experiment.The behavior of a range of impurities, in the presence of thermal hydrogen atoms, is examined analytically for non-equilibrium coronal conditions. The time required for an impurity species to establish equilibrium is found to be sensitively dependent on the plasma electron temperature, and it is strongly correlated with the ionization state distribution in equilibrium. The temporal and ensemble averaged calculations of the impurity charge states and radiation power which are presented here allow for the treatment of impurities without recourse to lengthy computation.In the article, we make use of all kinds of atomic rate coefficient, solve ionization rate equation, give simulation results of radiation losses of the impurities in homogeneous and compound plasma from light impurities, including:1) charge state distribution f_q;2) radiative cooling coefficient L_Z ;3) average charge < Z> ;4) total radiation power P_rad;5) effective charge Z_eff;From simulation results, it is found that the residence parameter of impurities plays a much important role in the enhancement of radiation losses of plasma.