Sinusoidal Ripples Micromachining on CHx Ablator for Hydrodynamics Growth Experiments

Hydrodynamics growth experiments involve rippled ablator samples (CHx, Ge:CH, or Si:CH). The rippled surface features a microscale mathematical shape (sinusoidal functions are widely used). Nevertheless, experiments have progressed with time, and samples evolved gradually from two-dimensional (planar samples) to three-dimensional geometries (capsules).

This paper presents various processes that have been developed to fulfill such specifications. Various technologies, based on laser means (excimer laser, Ti:sapphire laser) or mechanical ultraprecision means, have been successfully applied to ripples machining (planar samples or capsules).

The main results are discussed showing the ability and accuracy of each technology as well as their main limitations. We focus especially on our latest results (i.e., rippled or grooved capsules).