Semi-analytical calculations of radiation losses from light impurities in a non-corona approximation

A model for the calculation of radiation losses from light impurities is proposed, based on determination of the radial density profiles of radiating particles from balance between transport and ionization processes. The WKB-method is used to take into account the temperature dependence of the ionization coefficient. This allows to describe in particular the effect of the modification of the radial heat conductivity and temperature profile on impurity radiation by stochastization of the magnetic field. (orig.)