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Beta-Layering in Foam-Lined Surrogate IFE Targets

J. K. Hoffer, J. D. Sheliak, D. A. Geller, D. Schroen, P. S. Ebey

Fusion Science and Technology / Volume 50 / Number 1 / July 2006 / Pages 15-32

Technical Paper /

Solid deuterium-tritium (the symbol DT is used here to represent the equilibrium mixture of 50% deuterium and 50% tritium, having the molecular composition: 25% D2, 50% deuterium tritide molecules, and 25% T2) (DT) is nucleated from DT-wetted foam and subsequently forms a uniform layer by the beta-layering phenomenon. Compared to DT frozen on smooth metal surfaces, the surface roughness of the inner-lying pure DT solid-vapor interface is substantially lower at all modal values higher than ~10, possibly due to the small-grain-size polycrystalline nature of the solid. For thick layers, deleterious effects are observed, notably the formation of DT-rich vapor voids in the foam matrix and the subsequent propagation of these voids into the pure solid DT layer.

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