The use of atomic and molecular data in fusion plasma diagnostics

Considerable attention in modern large fusion experiments is focused on neutral beam penetrated plasma and on divertor plasma. In the former, ion/atom reactions drive the population dynamics while in the latter, although electron processes predominate, there are significant ion/atom and atom/atom influences. Neutral atoms in beams, impurities in beam penetrated plasma and complex partially ionized impurities in divertor plasma find themselves in the collisional radiative regime where the simple stationary excitation/cascade picture of the coronal model is invalidated by secondary collisions. Thus atomic data needed in such fusion applications are not a few reaction cross-sections but large complete sets which support full collisional-radiative models. Also, experiment analysis does not make use directly of fundamental atomic data but rather effective coefficients deduced from such models. In the paper, we describe two cases. The first is neutral deuterium beam attenuation and beam emission and its linking...