Trapping of Pellet Gloud Radiation in Thermonuclear Plasmas

The experimental and theoretical data on radiation trapping in clouds of pellets injected into thermonuclear plasmas are presented. The theoretical modeling is performed in terms of equivalent Stark spectral line widths under condition of LTE (Sakha-Boltzman) in pellet cloud plasmas. It is shown that a domain ofblackbody radiation could exist in hydrogen pellet clouds resulting in "pellet disappearance" effect which is absent in a case ofimpurity pellet clouds. Reasons for this difference are discussed. Keywords: pellet, cloud structure, ablation, radiation, trapping, LT