Hazard and failure modes criticalities analysis on the instrument control hardware design for ELT class of instrumentation

This research effort is focused on the identification of the failure modes and the hazards linked to the control hardware of the Multi-conjugate adaptive Optics Relay For ELT Observations (MORFEO). MORFEO is a module belonging to the Extremely Large Telescope, under construction by ESO in Armazones (Chile). It is a post-focal adaptive optics module designed to help to compensate for distortion caused by turbulence in the Earth's atmosphere. In this paper the FMECA and FTA on the Instrument Control Hardware design for ELT class of instrumentation (o MORFEO ICH design) are described, starting from a functional block diagram of the system. In particular, the Instrument Control Hardware has interfaces with most other subsystems, which means that its status consequences on the rest of the system deserve special attention. This work aims to provide an analysis of the dependability of the current design configuration and to analyse the effects of potential hazards and failures, in order to define the next steps of the design to keep compliance with the upper-level RAMS requirements.