Stability of Target Area Support System for SG-III Facility

In order to satisfy the requirement of optical system positioning in SG-III facility, the target area support system should provide a stable platform for optical elements. The target area support system includes a rectangular target area building, target chamber support structures and a switchyard steel frame. The vibrational stability of the target area support system will be achieved through a combination of structure design, large modal damping material, and friction dampers. Finite element analysis has been used to evaluate the target area support system. The rotation drifts of the transport mirrors, the translation drifts of the focal lenses, and the translation drift of the target are obtained. The orientation errors of each beam in target area system are less than 12.9μm based on the relation between the beam orientation error and optics elements drifts. And the safety factors are 1.44 to 2.3. The design of the target area support system has satisfied the stability requirements.