Abstract
Targets have been developed to measure supersonic radiation transport in aerogel foams using absorption spectroscopy. The target consists of an aerogel foam uniformly doped with either titanium or scandium inserted into an undoped aerogel foam package. This creates a localized doped foam region to provide spatial resolution for the measurement. Development and characterization of the foams is a key challenge in addition to machining and assembling the two foams so they mate without gaps. The foam package is inserted into a beryllium sleeve and mounted on a gold hohlraum. The target is mounted to a holder created using additive manufacturing and mounted on a stalk. The manufacturing of the components, along with assembly and metrology of the target are described here.
Highlights
When a supersonic radiation wave passes through a material, it heats the material on time scales much faster than the bulk motion of the material which is much closer to the material sound speed
One way to track the supersonic heat front is to measure the spatial distribution of the material temperature using imaging absorption spectroscopy
Targets using aerogel foams[5] doped with fine particles of titanium and scandium have been developed and are being tested[6] at the Omega laser facility[7]
Summary
The transverse direction to the heat wave (the non-imaging direction) by having only a region of the foam package doped. For these targets, a cylinder of doped aerogel foam is inserted into a larger undoped aerogel foam. The foam is placed in a beryllium sleeve and mounted to the top of a gold hohlraum. Assembly and characterization of these targets are presented
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