Stability analysis of final optical system of additional beam in “Shengguang-Ⅱ” laser facility

During the development of the additional beam system of “Shengguang-Ⅱ” facility, two vacuum cones and inner final optical systems would be fabricated on the ICF target chamber in order to offer Thompson probe and X-ray probe, which would influence the stability of the chamber. The FEM (Finite Element Model) analysis was used in design of the target chamber in order to optimize the mechanical design of the vacuum cone and the final optical system. From the measurement results by the displacement-sensor, the target position error being 2.110 μm caused by radial vibration of the addition beam final optical elements is obtained.