RADIATION RATES FOR LOW-Z IMPURITIES IN EDGE PLASMAS

The potential role of impurity radiation in the reduction of divertor plate heat loads places a new degree of importance on the accuracy of low Z impurity radiation emission rates for electron temperatures belo w 300 eV. We have calculated the radiated power loss using a collision al-radiative model for Be, B, C, Ne and Ar using a detailed multiple c onfiguration interaction model. These rates indicate L. Lengyel, IPP, 1/191 (1981); K. Lachner, R. Schneider, Fusion Eng. Design 22 (1993) 1 07 that significant enhancements above steady state collisional-radiat ive rates due to such effects as rapid recycling and charge exchange r ecombination will be necessary for impurity radiation to reduce the pe ak heat loads on divertor plates for ITER.