The additional surface variation of large diameter and thin-type KDP plate caused by fabrication errors

A finite element analysis model for the large diameter and thin-type KDP plate has been built up based on the experimental measurement data of surface profile and its mounting system with different types and sizes fabrication error. The impact of the fabrication error of KDP plate and its mounting system on the additional surface variation of KDP plate has been studied and simulated. It´s shown that the fabrication error of the edges of the KDP and the fabrication error with concave shape of support surface are the main reasons of causing the relatively large additional surface variation. The fabrication error of KDP plate also leads to the non-uniform deformation. The fabrication error with convex, the wavy shape of support surface, and the random fabrication error of the strip surface in the mounting system, lead to relatively small additional surface variation. The degree of additional surface variation due to the random fabrication error of support surface is between the former and the later.