Fabrication of aluminum wedge target used in shockwave experiment

The aluminum wedge target was produced by diamond turning technology. The actual profile of the wedge targets inclined surface is found to be a conical one. The surface roughness was characterized by Veeco NT1100 white light interferometer. The results indicate that the surface root-mean-square roughness of the plane part is less than 50 nm and the maximum peak-to-valley height there is less than 100 nm. The surface roughness of the inclined part is less than 200 nm. The larger measurement value of roughness appearing at the inclined part can be explained by the following two reasons: one is the variation of working angles of tool, which increases the roughness, the other is that the measurement profile is not the generatrix of cone, which enlarges the measurement results.