A low density foam liner, in place of a tamping gas, inside a hohlraum will reduce laser plasma interactions and possibly result in more uniform X-ray illumination on the capsule. Hohlraums made of gold are incompatible with a new chemical process to produce very low density, templated foams that possess excellent mechanical properties. Therefore, platinum is of interest for high-Z hohlraums because it is inert to the chemical etchants used to produce the low density foams. Platinum can be electrodeposited using commercially available aqueous electrolytes; however, published work on platinum electrodeposition has focused on thin films with high surface area. We will discuss electrochemical process developments that enabled non-porous, 3 - 20 μm thick Pt coatings on gold hohlraums, electroformed Pt hohlraums of thicknesses greater than 50 μm and a foam-lined hohlraum, where Pt was electrodeposited directly onto the foam starting material.

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.