Effect of thermal neutrals on the impurity ion radiation

Effect of thermal neutrals (deuterium) on radiation of C and O light impurities for T-15 device is investigated. It is shown on the basis of numerical solution of equations of balance and kinetic equation of thermal neutral transfer that in case of injection of fast neutrals into plasma the concentration of thermal neutrals exceeds considerably the concentration of injected neutrals. This results in additional growth of radiation losses 2-6 times. Effect of injection on ionization balance of ions and radiation losses of plasma when increasing energy of injected neutrals is considered. Problem of advisability of increasing energy of injected neutrals requires combined consideration both of effect of injection on radiation losses of plasma and growth of energy losses during production of beams of higher energies from the view-point of reactor energy balance as a whole