Mechanical design overview for the main structure of MAORY/MORFEO

Formerly known as MAORY [1][2][3], "MORFEO" ( Multiconjugate adaptive Optics Relay For ELT Observations) is a post-focal adaptive optics module for the ELT designed to help compensate for distortions caused by turbulence in the Earth's atmosphere that shall provide two exit ports: one for MICADO and one for a second instrument. This module, able to compensate the wave- front disturbances affecting the scientific observations, will be installed on the Nasmyth platform of the ELT telescope at the straight-through focus, and shall re-image the telescope focal plane to MICADO (the first light imager of the ELT) and in a second instrument port. In this paper we give a general overview of the mechanical design for MORFEO Main Structure (MMS) in the configuration presented for the Preliminary Design Review (PDR) in the first half of 2021, showing the proposed technical solutions for the MMS to fulfill the System requirements.