Influence of radiation transport on lithium fall motion in an ICF reactor

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Abstract
The fluid motion in the cavity of a HYLIFE reactor was calculated for the two extreme cases of optically thin and thick lithium gas in the hot core. The distinction is important because in the optically thin case (emission approximation) a major fraction of the gas energy is re-radiated to the main fall, following the lithium implosion, whereas in the optically thick case (diffusion approximation) virtually none escapes. This, in turn, has a major influence on the impulse ultimately imparted to the reactor walls. The complete set of finite difference equations used is given in an appendix.

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