Development of the mechanical structure for FERMI@Elettra APPLE II undulators

A conceptual design study of the mechanical structure for the APPLE II undulators of the FERMI@Elettra project has been carried out using FEM structural analysis and multiobjective optimization software. In this paper the predicted undulator performance is presented taking into account the mechanical deformations due to the variable magnetic forces. The resultant magnetic field and optical phase errors are shown to be negligibly small.